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  • 1.
    Babazadeh, Davood
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nazari, Mohammad
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska energisystem.
    Fidai, Muhammad Hassan
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Chenine, Moustafa
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Ghandhari, Mehrdad
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska energisystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Implementation of agent-based power flow coordination in AC/DC grids using co-simulation platform2014Inngår i: 2014 IEEE International Conference on Smart Grid Communications, SmartGridComm 2014, 2014, s. 188-193Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper presents work on the coordination of power sharing contribution of converters in an overlaid HVDC grid using a Multi-Agent System (MAS) approach. This approach is further implemented in a real-time co-simulation platform in order to study the proposed control scheme including the supporting information and communication Technology (ICT) systems. The platform consists of OPNET, a communication network simulator, connected to a real-time power system simulator through virtualized and real devices. Furthermore, the impact of different supporting system parameters such as bit-error rate has been studied using this real-time co-simulation platform.

  • 2.
    Fidai, Muhammad Hassan
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Babazadeh, Davood
    KTH, Skolan för elektro- och systemteknik (EES).
    Hanning, Jonathan
    DC Grids Simulation Center, ABB .
    Larsson, Tomas
    DC Grids Simulation Center, ABB .
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Real-time Implementation of Optimal Power Flow Calculator for HVDC Grids2015Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The aim of the paper is to present the centralized architecture for power balancing management in an HVDC, High Voltage Direct Current, grid connecting different AC areas with high penetration of variable energy resources. Such a centralized high level DC Supervisory Control (DCSC) that functions in slower time scale compared to outer level controller has been evaluated in a real time co-simulation test-bed. The test platform includes OPAL-RT’s eMEGAsim real time simulator to model the power system, the ABB’s industrial HVDC controller (MACH), real time communication simulator OPNET to model the communication network and finally the DCSC application which is implemented on a Linux machine. The DCSC consists of a network topology manager to identify the grid configuration and employs an Optimal Power Flow (OPF) calculator based on interior point optimization method to determine the set-point values for all HVDC stations in a grid. The OPF calculator takes into account the DC voltage, converter and DC line constraints. The performance of the DC supervisory control has been tested for various test cases for a 7-terminal HVDC grid. Test cases include I) Variable power generation from wind farms, II) Station disconnection and III) DC grid islanding. Besides, the proper sampling rate has been chosen and justified to show the benefit of frequent updating of set-point compared to letting the DC droop control scheme take over the mismatch in the system. The results of different test cases show that a DCSC can improve the power extraction from wind farms by updating the set-points following any change in the system. Using a 3.2 GHz machine, it approximately takes 15 ms for the DCSC to converge to a proper solution and send the updated set-points.

  • 3.
    Fidai, Muhammad Hassan
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Babazadeh, Davood
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Muthukrishnan, Arvind
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Supervisory Control for VSC-HVDC Grid Interconnecting AC Systems2015Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The aim of the paper is to introduce an independentsupervisory architecture for optimal control of power flow inHVDC grids. Such an independent DC supervisory control isable to manage the optimal operation of connecting VSCs incooperation with other AC SCADA systems. Identifying the gridtopology, DC supervisory control employs an optimal power flow(OPF) calculator based on interior point optimization method todetermine the setpoint values for all HVDC stations in a grid.The performance of such an independent supervisory control hasbeen studied through various test case scenarios using a real-timeco-simulation platform.

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