ISSN 1000-1026
CN 32-1180/TP
  • ISSN 1000-1026
  • CN 32-1180/TP

Citation: LIU Ni,ZHANG Changhua,LIAO LI,CHEN Xin,CHEN Shuheng,LIU Qunying.Analysis on Virtual Torque and Oscillation Instability Mechanism of Virtual Synchronous Generator with Reactive Power-Voltage Controller[J].Automation of Electric Power Systems,2019,43(6):107-115. DOI: 10.7500/AEPS20180608005 copy

Analysis on Virtual Torque and Oscillation Instability Mechanism of Virtual Synchronous Generator with Reactive Power-Voltage Controller

  • Received Date: June 08, 2018
    Accepted Date: November 07, 2018
    Available Online: February 21, 2019

  • Abstract:

        Virtual synchronous generator(VSG)has become an attractive scheme for connecting inverters with grids by simulating electromechanical transient process of synchronous generators. However, there also exists power oscillation problems in the VSG, and the related research on oscillation mechanism is needed. Based on the theory of torque analysis in the traditional power system, this paper establishes a small-signal model of VSG with reactive power-voltage controller. Combined with the oscillation mode, the virtual torque coefficient is redefined. Then the relationship between the virtual torque coefficient and VSG stability is analyzed. It is mathematically proved that the lack of virtual damping torque will lead to power oscillation instability of VSG. Taking the VSG with robust droop control as an example, the calculation method of virtual torque coefficient is given, and the conclusion is verified through PSCAD/EMTDC simulation and physical experiment. Finally, this paper discusses the effect of VSG with reactive power-voltage controller on the virtual torque coefficient and system small-signal stability from different perspectives, such as the initial state of the system, line parameters and controller parameters. The research is beneficial to the VSG controller design and the system small-signal stability analysis.


  • Keywords:

    small-signal model; virtual synchronous generator(VSG); robust droop controller; grid-connected inverter; virtual torque coefficient


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