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  • 1. Angioni, A.
    et al.
    Lu, Shengye
    Hooshyar, Hossein
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Cairo, Ignasi
    Repo, Sami
    Ponci, Ferdinanda
    Della Giustina, Davide
    Kulmala, Anna
    Dede, Alessio
    Monti, Antonello
    Del Rosario, Gerard
    Vanfretti, Luigi
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Garcia, C.C.
    A distributed automation architecture for distribution networks, from design to implementation2018In: Sustainable Energy, Grids and Networks, ISSN 0284-4354, E-ISSN 2352-4677, Vol. 15, p. 3-13Article in journal (Refereed)
    Abstract [en]

    With the current increase of distributed generation in distribution networks, line congestions and PQ issues are expected to increase. The smart grid may effectively coordinate DER, only when supported by a comprehensive architecture for automation. In IDE4L project such architecture is designed based on monitoring, control and business use cases. The IDE4L instance of SGAM architecture is derived and explained in details. The automation actor are specified in terms of interfaces, database and functions. The division in these three layers boosted the implementation phase as dedicated interfaces, databases or application has been developed in a modular way and can be installed in different HW/SW. Some implementation instances are presented and the main output of the architecture is discussed with regards to some indexes as communication traffic and level of distribution of automation functions.

  • 2.
    Bidadfar, Ali
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Hooshyar, Hossein
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Monadi, Mehdi
    Vanfretti, Luigi
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Decoupled voltage stability assessment of distribution networks using synchrophasors2016In: Power and Energy Society General Meeting (PESGM), 2016, 2016, article id 7741644Conference paper (Refereed)
    Abstract [en]

    This paper presents a real-time voltage stabilityassessment in distribution networks (DNs) capable of separatingthe effects of the transmission and distribution network by usingsynchronized phasor measurements. The method aims to assisttransmission and distribution system operators to quantify theneed of their services in different parts of the DN in order toprovide adequate voltage support to their specific stakeholders.The method uses data from phasor measurement units (PMUs) toestimate models for both DN and transmission network (TN). ATh´evenin equivalent model is estimated for the TN and a T-modelfor the DN. By applying the superposition theorem on these twomodels, the contribution of each network to the overall systemvoltage stability can be distinguished at a specific bus (equippedwith a PMU). The method has been validated by a hardware-inthe-loop setup which consists an OPAL-RT real-time simulatorand three PMUs.

  • 3.
    Firouzi, Seyed Reza
    et al.
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Hooshyar, Hossein
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Mahmood, Farhan
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Vanfretti, Luigi
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    An IEC 61850-90-5 gateway for IEEE C37.118.2 synchrophasor data transfer2016Conference paper (Refereed)
  • 4.
    Firouzi, Seyed Reza
    et al.
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Hooshyar, Hossein
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Mahmood, Farhan
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Vanfretti, Luigi
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    The role of communication standards in the active network management2015Conference paper (Refereed)
  • 5.
    Firouzi, Seyed Reza
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Vanfretti, Luigi
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems. KTH The Royal Institute of Technology.
    Ruiz-Alvarez, A.
    Mahmood, Farhan
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems. KTH The Royal Institute of Technology.
    Hooshyar, Hossein
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems. KTH The Royal Institute of Technology.
    Cairo, I.
    An IEC 61850-90-5 gateway for IEEE C37.118.2 synchrophasor data transfer2016In: IEEE Power and Energy Society General Meeting, IEEE, 2016Conference paper (Refereed)
    Abstract [en]

    This work describes the implementation and validation of a library named Khorjin to receive and parse synchrophasor data from a PμPDC based on IEEE C37.118.2 protocol, map it to the IEC 61850 data model and transmit the synchrophasor data through either Routed-Sampled Value or Routed-GOOSE services defined in the IEC 61850-90-5 protocol. In addition, the library is capable of acting as the receiver and parser of IEC 61850-90-5 messages, extracting raw synchrophasor data and feeding to subscriber applications. The functionality of the Khorjin library is validated in a Real-Time Hardware-in-the-Loop (HIL) simulation environment to asses its conformance to the functional requirements of the IEC 61850-90-5 standard.

  • 6.
    Firouzi, Seyed Reza
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems. SmarTS Lab.
    Vanfretti, Luigi
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems. SmarTS Lab.
    Ruiz-Alvarez, Albert
    Catalonia Institute for Energy Research (IREC), Barcelona, Spain.
    Hooshyar, Hossein
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems. SmarTS Lab.
    Mahmood, Farhan
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems. SmarTS Lab.
    Interpreting and Implementing IEC 61850-90-5 Routed-Sampled Value and Routed-GOOSE Protocols for IEEE C37.118.2 Compliant Wide-Area Synchrophasor Data Transfer2016In: Electric power systems research, ISSN 0378-7796, E-ISSN 1873-2046, Vol. 144, p. 255-267Article in journal (Refereed)
    Abstract [en]

    Flexibility and adaptability requirements of future electric power grids for integrating DERs call for the developmentof Wide-Area Monitoring, Protection And Control (WAMPAC) applications, utilizing synchrophasor measurementsprovided by the Phasor Measurement Units (PMUs).IEEE C37.118 is the most utilized protocol for real-time exchange of synchronized phasor measurement data. In orderto full some gaps not addressed in IEEE C37.118, and also to harmonize with the IEC 61850 power utility automationstandard, the IEC 61850-90-5 technical report has been developed. IEC TR 61850-90-5 introduces a mechanism fortransfer of digital states and time synchronized phasor measurement data over wide-area networks between PhasorMeasurement Units (PMUs), Phasor Data Concentrators (PDCs) and WAMPAC applications in the context of IEC61850.This work interprets the IEEE C37.118.2 and IEC 61850-90-5 Routed-Sampled Value and Routed-GOOSE protocolsand describes the design and implementation of a library named Khorjin with the functionality of (1) an IEEE C37.118.2to IEC 61850-90-5 gateway and protocol converter and, (2) an IEC 61850-90-5 subscriber and trac parser.The main contribution of this work is the development of Khorjin library using only standard C libraries (i.e.independent from any operating system). This is allowing the use of the library in dierent platforms.The design requirements and functionality of the Khorjin library has been tested in the KTH SmarTS Lab Real-TimeHardware-in-the-Loop (HIL) simulation environment to assess its conformance to the functional requirements of IEEEC37.118.2 and IEC 61850-90-5 standards.

  • 7. Haddadi, Aboutaleb
    et al.
    Hooshyar, Hossein
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Mahseredjian, Jean
    Dufou, Christian
    Vanfretti, Luigi
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    A first step towards the implementation and software-to-software validation of an active distribution network model2017Conference paper (Refereed)
  • 8.
    Hooshyar, Hossein
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Baran, M. E.
    Fault analysis on distribution feeders employing solid state transformers2014In: 2014 IEEE PES General Meeting | Conference & Exposition: , IEEE Computer Society, 2014, p. 6938868-Conference paper (Refereed)
    Abstract [en]

    This paper focuses on fault analysis of a distribution feeder which employs Solid State Transformers (SSTs) rather than magnetic transformers in order to facilitate large scale integration of Distributed Energy Resources (DERs) into the system. To estimate the fault current profile on such a feeder, the paper proposes a new method which extends the capability of conventional short-circuit analysis method. Performance of the proposed method has been assessed by simulations on a sample distribution feeder.

  • 9.
    Hooshyar, Hossein
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Baran, M. E.
    Firouzi, Seyed Reza
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Vanfretti, Luigi
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    PMU-assisted overcurrent protection for distribution feeders employing solid state transformers2017In: Sustainable Energy, Grids and Networks, ISSN 0284-4354, E-ISSN 2352-4677, Vol. 10, p. 26-34Article in journal (Refereed)
  • 10.
    Hooshyar, Hossein
    et al.
    North Carolina State University, Raleigh, NC, United States .
    Baran, Mesut E.
    Vanfretti, Luigi
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Coordination assessment of overcurrent relays in distribution feeders with high penetration of PV systems2013In: 2013 IEEE Grenoble Conference PowerTech, POWERTECH 2013, IEEE , 2013, p. 6652117-Conference paper (Refereed)
    Abstract [en]

    This paper investigates the impact of Photovoltaic (PV) systems on the coordination between overcurrent relays in a PV-dominated distribution feeder. The paper shows under what conditions and how significant the PV systems affect the coordination. The paper also proposes a method for assessing the coordination in such feeders. Performance of the proposed methods has been assessed by simulations on a sample distribution feeder.

  • 11.
    Hooshyar, Hossein
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Mahmood, Farhan
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Vanfretti, Luigi
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    HIL simulation of a distribution system reference model2014In: 11th Nordic Conference on Electricity Distribution System Management and Development (NORDAC), Statnett , 2014Conference paper (Refereed)
  • 12.
    Hooshyar, Hossein
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Mahmood, Farhan
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Vanfretti, Luigi
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Specification and implementation of a reference grid for distribution network dynamic studies2014In: 2014 IEEE PES General Meeting | Conference & Exposition, IEEE , 2014, p. 1-5Conference paper (Refereed)
    Abstract [en]

    This paper presents the IDE4L project reference grid model developed to perform real-time hardware-in-the-loop simulations. The simulations will be carried out to study distribution network dynamics and to evaluate the techniques developed in IDE4L project for TSO/DSO interactions. Performance of the grid model is shown by sample simulation results.

  • 13.
    Hooshyar, Hossein
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Mahmood, Farhan
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Vanfretti, Luigi
    KTH, School of Electrical Engineering (EES), Electric Power Systems. Statnett SF, Norway.
    Baudette, Maxime
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Specification, implementation, and hardware-in-the-loop real-time simulation of an active distribution grid2015In: Sustainable Energy, Grids and Networks, ISSN 0284-4354, E-ISSN 2352-4677, Vol. 3Article in journal (Refereed)
    Abstract [en]

    This paper presents the IDE4L project reference grid model developed to serve as a benchmark for studies on distribution grid dynamics within the project. The paper demonstrates a MATLAB/Simulink implementation of the reference grid to be used in real-time hardware-in-the-loop simulations. The simulations will be carried out to study distribution grid dynamics and to evaluate the techniques developed in IDE4L project for TSO/DSO interactions. Performance of the grid model is shown through sample real-time simulation results and a hardware-in-the-loop setup for PMU-based grid monitoring applications.

  • 14.
    Hooshyar, Hossein
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Vanfretti, Luigi
    KTH, School of Electrical Engineering and Computer Science (EECS), Electric Power and Energy Systems.
    A SGAM-based architecture for synchrophasor applications facilitating TSO/DSO interactions2017In: 2017 IEEE Power and Energy Society Innovative Smart Grid Technologies Conference, ISGT 2017, IEEE, 2017, article id 8085977Conference paper (Refereed)
    Abstract [en]

    Distribution grid dynamics are becoming increasingly complex due to the transition of these networks from passive to active networks. This transition requires increasing the observability and awareness of the interactions between Transmission and Distribution (T&D) grids, particularly to guarantee adequate operational security. As part of the work carried out in the EU-funded IDE4L project, a specific use case, containing PMU-based monitoring functions, has been defined to support the architecture design of a distribution grid automation system. As a result, the architecture can accommodate for synchrophasor applications that provide key dynamic information extraction and exchange between DSO and TSO. This paper presents the use case and the portion of the IDE4L architecture that accommodates for scenarios that exploit synchrophasors for monitoring applications.

  • 15.
    Hooshyar, Hossein
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Vanfretti, Luigi
    KTH, School of Electrical Engineering (EES), Electric Power Systems. Statnett SF, Norway.
    Multiphase unbalanced power flow and fault analysis of distribution networks with high penetration of inverter-interfaced DERs2015In: 2015 Ieee Jordan Conference on Applied Electrical Engineering and Computing Technologies (Aeect), Institute of Electrical and Electronics Engineers (IEEE), 2015Conference paper (Refereed)
    Abstract [en]

    The traditional power flow and fault analysis methods fail to meet the requirements in both performance and accuracy aspects in the distribution network applications. This is due to the unbalanced multiphase nature of the distribution network and also due to the emerging penetration of renewable generation at the distribution level. This paper proposes a comprehensive method for power flow solution and fault analysis of multiphase unbalanced distribution networks with high penetration of inverter-interfaced DERs. Also, the self-protection scheme employed for the inverter of the DERs is also formulated in the proposed method. Performance of the proposed method has been assessed by simulations on a sample distribution network.

  • 16.
    Hooshyar, Hossein
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Vanfretti, Luigi
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Power flow solution for multiphase unbalanced distribution networks with high penetration of photovoltaics2013In: ELECO 2013 - 8th International Conference on Electrical and Electronics Engineering, IEEE conference proceedings, 2013, p. 167-171Conference paper (Refereed)
    Abstract [en]

    Power flow analysis on a Photovoltaic System (PV)dominated distribution network is rather different than a conventional distribution system. This paper proposes a new three-phase power flow solution for such networks that considers the multiphase unbalanced nature of distribution systems together with different system topologies. Power flow contributions of PVs and different types of loads are also considered. The performance of the proposed method has been assessed by simulations on a sample distribution network.

  • 17.
    Hooshyar, Hossein
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Vanfretti, Luigi
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Dufour, Christian
    Delay-free parallelization for real-time simulation of a large active distribution grid model2016Conference paper (Refereed)
    Abstract [en]

    Parallel computations for real-time simulation of large power system models is conventionally performed by using propagation delays embedded in line models. However, using the same approach to simulate distribution grids results in modelling inaccuracies, due to the short lengths of most distribution feeders. This paper illustrates the drawbacks of the delay-based parallelization technique by assessing the dynamic response of a large active distribution grid model and applies a delay-free parallelization technique (i.e. the State-Space-Nodal algorithm) to address inaccuracy issues inherent to the delay-based approach.

  • 18.
    Hooshyar, Hossein
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Vanfretti, Luigi
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Mahmood, Farhan
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Singh, Ravi Shankar
    KTH.
    Singh, Narender
    KTH.
    Bidadfar, Ali
    KTH.
    Firouzi, Seyed Reza
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Synchrophasor applications facilitating interactions in transmission and distribution operations2017In: 2017 IEEE Manchester PowerTech, Powertech 2017, IEEE, 2017, article id 7980917Conference paper (Refereed)
    Abstract [en]

    Dynamics of distribution grids are becoming more and more complex to analyze due to their transition from passive networks to active ones. This has necessitated the increase of observability between Transmission and Distribution (T&D) grids for operational security and real-time security assessment. This paper presents an overview of the IDE4L project, funded by the European Commission, where a system of PMU data-based monitoring applications has been developed to facilitate TSO-DSO interactions.

  • 19.
    Mahmood, Farhan
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems. KTH The Royal Institute of Technology.
    Hooshyar, Hossein
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems. KTH The Royal Institute of Technology.
    Lavenius, Jan
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Lund, Per
    Vanfretti, Luigi
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems. KTH The Royal Institute of Technology.
    Real-time reduced steady state model synthesis of active distribution networks using PMU measurements2016In: IEEE Transactions on Power Delivery, ISSN 0885-8977, E-ISSN 1937-4208, Vol. 32, no 1, p. 546-555Article in journal (Refereed)
    Abstract [en]

    Due to the increase of generation sources in distribution networks, it is becoming more and more complex to develop and maintain models of these networks. Network operators need to determine reduced models of distribution networks to be used in grid management functions. This paper presents a novel method that synthesizes steady state models of unbalanced active distribution networks by the use of dynamic measurements (time series) from PMUs. As PMU measurements may contain errors and bad data, the paper presents the application of a Kalman Filter technique for real-time data processing. In addition, PMU data captures the power system’s response at different time-scales, which are generated by different types of power system events; the presented Kalman Filter has been improved to extract the steady state component of the PMU measurements to be fed to the steady state model synthesis application. Performance of the proposed methods has been assessed by real-time hardware-in-the-loop simulations on a sample distribution network.

  • 20.
    Mahmood, Farhan
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Hooshyar, Hossein
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Vanfretti, Luigi
    KTH, School of Electrical Engineering (EES), Electric Power Systems. Statnett SF, Norway.
    A method for extracting steady state components from syncrophasor data using Kalman filters2015In: 2015 IEEE 15th International Conference on Environment and Electrical Engineering, EEEIC 2015 - Conference Proceedings, IEEE , 2015, p. 1498-1503Conference paper (Refereed)
    Abstract [en]

    Data from Phasor Measurement Units (PMUs) may be exploited to provide steady state information to the applications which require it. Raw PMU data is polluted with noise and cannot be directly fed to applications without adequate processing. This paper presents a method to extract steady state components from Syncrophasor data using Kalman Filters (KF). This method is capable of reducing the noise, to compensate for missing data and filtering of outliers in signals. The Residue in each KF iteration is computed. The measurement noise covariance matrix R is calculated by computing the variance of residue using rolling windows. The performance of presented method is evaluated by using PMU data generated from a Hardware-In-the-Loop (HIL) experimental setup.

  • 21.
    Mahmood, Farhan
    et al.
    KTH, School of Electrical Engineering (EES), Electric power and energy systems. KTH The Royal Institute of Technology.
    Hooshyar, Hossein
    KTH, School of Electrical Engineering (EES), Electric power and energy systems. KTH The Royal Institute of Technology.
    Vanfretti, Luigi
    KTH, School of Electrical Engineering (EES), Electric power and energy systems. KTH The Royal Institute of Technology.
    Extracting Steady State Components from Synchrophasor Data Using Kalman Filters2016In: Energies, ISSN 1996-1073, E-ISSN 1996-1073, Vol. 9Article in journal (Refereed)
    Abstract [en]

    Data from phasor measurement units (PMUs) may be exploited to provide steady state information to the applications which require it. As PMU measurements may contain errors and missing data, the paper presents the application of a Kalman Filter technique for real-time data processing. PMU data captures the power system’s response at different time-scales, which are generated by different types of power system events; the presented Kalman Filter methods have been applied to extract the steady state components of PMU measurements that can be fed to steady state applications. Two KF-based methods have been proposed, i.e., a windowing-based KF method and “the modified KF”. Both methods are capable of reducing noise, compensating for missing data and filtering outliers from input PMU signals. A comparison of proposed methods has been carried out using the PMU data generated from a hardware-in-the-loop (HIL) experimental setup. In addition, a performance analysis of the proposed methods is performed using an evaluation metric.

  • 22.
    Mahmood, Farhan
    et al.
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Hooshyar, Hossein
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Vanfretti, Luigi
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Implementation of an architecture for steady state model synthesis of active distribution networks using syncrophasors2016Other (Refereed)
  • 23.
    Mahmood, Farhan
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Hooshyar, Hossein
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Vanfretti, Luigi
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Sensitivity Analysis of a PMU-Fed Steady State Model Synthesis Method for Active Distribution Networks2017In: 2017 IEEE POWER & ENERGY SOCIETY GENERAL MEETING, IEEE, 2017Conference paper (Refereed)
    Abstract [en]

    The purpose of this paper is to carry outsensitivityanalysisofa method that performssteady state model synthesis(SSMS)of active distribution networksusing SyncrophasorMeasurements.An extended version of the Total Vector Error (TVE) is used as a metric to evaluate how sensitive the output of the SSMS method is to the changesinthe inputsto the method.Location of PMUs in the system,system operating point,and occurrence of different disturbancesareconsideredas the input tothe SSMS method. The sensitivity analysis is performed through several case studieseach containing changesin one of the inputs.

  • 24.
    Mahmood, Farhan
    et al.
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Vanfretti, Luigi
    KTH, School of Electrical Engineering (EES), Electric power and energy systems. Statnett SF, Norway.
    Hooshyar, Hossein
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Detailed modeling of a photovoltaic system for distribution networks2014Conference paper (Refereed)
  • 25.
    Mahmood, Farhan
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Vanfretti, Luigi
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Hooshyar, Hossein
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Modeling of a detailed photovoltaic generation system for EMT-type simulation2014In: ENERGYCON 2014 - IEEE International Energy Conference, IEEE Computer Society, 2014, p. 916-921Conference paper (Refereed)
    Abstract [en]

    This article presents a detailed three-phase grid connected PV model which includes important control systems required for EMT-type simulation. A one diode model for the PV array is used to simulate environmental constraints such as solar irradiation. A detailed control system including dc voltage control, inner current control, MPPT and PWM control are implemented in order to simulate the model during steady state and dynamic conditions. The PV model is merged with a simple distribution network to investigate the PV's interaction with the AC grid. Several simulation scenarios are presented in order to validate the performance of the model.

  • 26. Mahseredjian, Jean
    et al.
    Haddadi, Aboutaleb
    Hooshyar, Hossein
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Vanfretti, Luigi
    Rensselaer Polytechnic Institute, USA .
    Dufour, Christian
    An active distribution network model for smart grid control and protection studies: model validation progress2017In: 2017 IEEE Electrical Power and Energy Conference, EPEC 2017, IEEE, 2017, p. 373-377Conference paper (Refereed)
    Abstract [en]

    This paper presents the implementation of an Active Distribution Network (ADN) model and its qualitative assessment using different off-line and real-time simulation tools. The objective is to provide software-to-software verification for the establishment of the model as a potential benchmark. Expanding upon the authors’ previous work [7], this paper provides additional simulation results, cross-examination of the models, and presents the latest modifications incorporated to address practical considerations. The ADN has multiple voltage levels and features various types of distributed energy resources including solar, wind generators, and storage. It further incorporates control and protection schemes for distributed energy resource units and loads; hence, it adequately represents the complex dynamics of an active distribution grid compared to the existing distribution grid test cases in the literature. As such, the test system can be used by other researchers to test numerical methods and conduct research on Smart Grid control, protection, and dynamic studies.

  • 27.
    Singh, Narender
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Hooshyar, Hossein
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems. KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Vanfretti, Luigi
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Feeder dynamic rating application for active distribution network using synchrophasors2017In: Sustainable Energy, Grids and Networks, ISSN 0284-4354, E-ISSN 2352-4677, Vol. 10, p. 35-45Article in journal (Refereed)
  • 28.
    Singh, Ravi Shankar
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Baudette, Maxime
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Hooshyar, Hossein
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Vanfretti, Luigi
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems. Statnett.
    Almas, Muhammad Shoaib
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Løvlund, Stig
    Statnett.
    ‘In Silico’ Testing of a Decentralized PMUData-Based Power Systems Mode Estimator2016In: Power and Energy Society General Meeting (PESGM), 2016, IEEE conference proceedings, 2016Conference paper (Refereed)
    Abstract [en]

    This paper presents the software implementation ofa Phasor Measurement Unit (PMU) data-based mode estimationapplication in a decentralized mode estimation architecture. Thiswork builds from previous efforts in the development of a modeestimator implemented using a centralized architecture, meaninga set of modes were estimated for the whole system in a singleprocessing location. One drawback of mode estimators that usecentralized mode architecture is that the observability and thereforeestimation of important low-damped local electromechanicalmodes can be affected by the higher observability of otherdominant modes of the systems (e.g inter-area modes). This workproposes, implements and tests a decentralized architecture inorder to increase the observation capability to provide betterestimates of local low damped oscillations. In this architecture,the data from a single PMU or a group of local PMUs couldbe processed by a processor to estimate the modal parametersobserved at a specific part of the grid or observed by specificgroup of PMUs. The decentralized architecture and results oftests are presented in this paper together with comparison witha centralized architecture.

  • 29. Singh, Ravi Shankar
    et al.
    Hooshyar, Hossein
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Vanfretti, Luigi
    KTH, School of Electrical Engineering (EES), Electric Power Systems. Statnett SF, Norway.
    Assessment of Time Synchronization Requirements for Phasor Measurement Units2015Conference paper (Refereed)
    Abstract [en]

    This paper assesses time synchronization sources suitable for Phasor Measurement Unit (PMU) applications in power systems. The paper investigates PMU phase error due to PMU timing inaccuracy and the presence of current and voltage transformers. This paper also shows that in practical on-field applications of commercial PMUs, the required accuracy of the time source should be better than the 31.8μs limit mentioned in the IEEE Standard for Synchrophasor Measurements for Power Systems C37.118.1-2011 and could be well in the sub-microsecond range. The laboratory test set-up is discussed in brief.

  • 30. Singh, Ravi Shankar
    et al.
    Hooshyar, Hossein
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Vanfretti, Luigi
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Experimental real-time testing of a decentralized PMU data-based power systems mode estimator2017Conference paper (Refereed)
  • 31.
    Singh, Ravi Shankar
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Electric Power and Energy Systems.
    Hooshyar, Hossein
    KTH, School of Electrical Engineering and Computer Science (EECS), Electric Power and Energy Systems.
    Vanfretti, Luigi
    KTH.
    Experimental Real-Time Testing of a Decentralized PMU Data-Based Power Systems Mode Estimator2017In: 2017 IEEE POWER & ENERGY SOCIETY GENERAL MEETING, IEEE , 2017Conference paper (Refereed)
    Abstract [en]

    This paper presents the results and testing of a Phasor Measurement Unit (PMU) data-based mode estimation application deployed within a decentralized architecture using a real-time test platform. This work is a continuation of that in [1], which described a decentralized mode estimation architecture that enables the application to better detect local modes whose observability is affected by other more observable modes. The tests in this paper were carried out using an active distribution network (ADN) comprised of a high voltage network connected to a distribution grid including renewable energy resources (RES). The developed application was run in a decentralized architecture where each PMU was associated with its own processing unit which was running the application to estimate modes from the time-series data. The results of the decentralized mode estimation architecture are analyzed and compared with its centralized counterpart.

  • 32. Singh, Ravi Shankar
    et al.
    Hooshyar, Hossein
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Vanfretti, Luigi
    KTH, School of Electrical Engineering (EES), Electric Power Systems. Statnett SF, Norway.
    Laboratory Test Set-up for the Assessment of PMU Time Synchronization Requirements2015Conference paper (Refereed)
    Abstract [en]

    This paper presents the construction of a Hardware-in-the-loop laboratory test set-up designed to assess the time synchronization requirements of Phasor Measurement Units (PMUs). The test set-up also allows to investigate the effects of signal phase shifts caused by current and voltage transformers, errors in timing source and the impact of these errors when determining time synchronization compliance of PMUs. The paper also describes the structure of an IRIG-B time-sync real-time implementation, which allowed real-time hardware-in-the-loop simulation by providing a PMU with a high-accuracy timing source.

  • 33. Singh, Ravi Shankar
    et al.
    Hooshyar, Hossein
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Vanfretti, Luigi
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Testing and analysis of centralized and decentralized mode estimation architectures for active distribution network monitoring2017In: 2017 IEEE Manchester PowerTech, Powertech 2017, IEEE conference proceedings, 2017, article id 7981163Conference paper (Refereed)
    Abstract [en]

    This paper presents the results of testing a Phasor Measurement Unit (PMU) data-based mode estimation application deployed within a decentralized architecture using a realtime test platform. By extending the author's previous work in [1], this paper shows that a decentralized architecture is effective in detecting local modes which are less observable in presence of other dominant modes when estimated in a centralized architecture. The tests in this paper were carried out that was coupled with actual PMUs, a Phasor Data Concentrator (PDC) and two types of mode estimation architectures. The is network comprised of a high voltage network connected to an Active Distribution Network (ADN) with Renewable Energy Resources (RES). In the decentralized architecture where each PMU was associated with its own processing unit running to compute mode estimates from the acquired time-series data. The results of the decentralized mode estimation architecture are analyzed and compared with centralized architecture.

  • 34.
    Vanfretti, Luigi
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Hooshyar, Hossein
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Mahmood, Farhan
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Singh, Ravi Shankar
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Bidadfar, Ali
    KTH, School of Electrical Engineering (EES), Electric power and energy systems.
    Singh, Narender
    Synchrophasor applications for distribution networks enhancing T&D operation and information exchange2016Conference paper (Other academic)
  • 35.
    Vanfretti, Luigi
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Hooshyar, Hossein
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Singh, Ravi Shankar
    Bidadfar, Ali
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Mahmood, Farhan
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Synchrophasor Applications for Distribution Networks, Supporting The IDE4L Use Case2017Conference paper (Refereed)
    Abstract [en]

    Distribution grid dynamics are becoming increasingly complex to analyze due to their transition from passive to active networks. This transition requires to increase the observability and awareness of the interactions between Transmission and Distribution (T&D) grids, particularly to guarantee adequate operational security. As part of the work carried out in the EU-funded IDE4L project, a specific use case, containing PMU-based monitoring functions, has been defined to support the architecture design of a distribution grid automation system. As a result, the architecture can accommodate for key dynamic information extraction and exchange between Distribution System Operator (DSO) and Transmission System Operator (TSO). This paper presents the use case and focuses on the technical aspects related to the development and implementation of the PMU-based monitoring functionalities.

  • 36.
    Vanfretti, Luigi
    et al.
    KTH.
    Hooshyar, Hossein
    KTH.
    Singh, Ravi Shankar
    KTH.
    Bidadfar, Ali
    KTH.
    Mahmood, Farhan
    KTH.
    Synchrophasor Applications for Distribution Networks, Supporting The IDE4L Use Case2017In: 2017 IEEE POWER & ENERGY SOCIETY GENERAL MEETING, IEEE , 2017Conference paper (Refereed)
    Abstract [en]

    Distribution grid dynamics are becoming increasingly complex to analyze due to their transition from passive to active networks. This transition requires to increase the observability and awareness of the interactions between Transmission and Distribution (T&D) grids, particularly to guarantee adequate operational security. As part of the work carried out in the EU-funded IDE4L project, 11 specific use case, containing PMU-based monitoring functions, has been defined to support the architecture design of a distribution grid automation system. As a result, the architecture can accommodate for key dynamic information extraction and exchange between Distribution System Operator (DSO) and Transmission System Operator (TSO). This paper presents the use case and focuses on the technical aspects related to the development and implementation of the PMU-based monitoring functionalities.

1 - 36 of 36
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