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Virtual Inertia Control Strategy Based on Improved Frequency Differential Operation

1.College of Mechanical and Control Engineering, Guilin University of Technology, Guilin 541004, China;2.School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China

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This work is supported by Research Startup Fund of Guilin University of Technology (No. GUTQDJJ2019167).

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    The renewable energy sources accessed to the power grid by fast-response power converters has received widespread attention, but they often cause frequency stability problems due to the reduction of power system equivalent inertia. This paper analyzes the effectiveness of two existing solutions: the direct differential operation method using phase-locked loop (PLL) frequency has a slow dynamic response and cause noise amplifications; the frequency differential control method using the second-order generalized integrator based frequency-locked loop (SOGI-FLL) can avoid the frequency differential operation. Nevertheless, the SOGI-FLL has a limited ability in rejecting the grid voltage disturbances. To deal with this problem, this paper proposes a virtual inertia control strategy with the cascaded SOGI-FLL to accurately evaluate the frequency signal. The frequency self-adaptive filter based on SOGI is added to the SOGI-FLL control loop, to enhance the disturbance suppression capabilities. Finally, both simulation and experimental platforms of the microgrid with diesel and energy storage system are established, and the simulation and experimental results verify the effectiveness of the proposed strategy.

    表 1 Table 1
    图1 柴储系统频率协调控制框图Fig.1 Block diagram of frequency regulation control for diesel and energy storage system
    图2 单相PLL的控制框图Fig.2 Block diagram of control for a single-phase PLL
    图3 SOGI-FLL的控制框图Fig.3 Block diagram of control for SOGI-FLL
    图4 CSOGI-FLL的控制模型Fig.4 Control model of CSOGI-FLL
    图5 仿真结果Fig.5 Simulation results for tests 1 to 4
    图 柴储系统结构图Fig. Structure of the battery-diesel microgrid system
    图 功率阶跃响应的实验结果Fig. Experimental results for power step response
    图 基于虚拟惯量控制的频率稳定性实验Fig. Frequency stability experiment based on virtual inertia control
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SHI Rongliang,ZHANG Lieping,WANG Wencheng,et al.Virtual Inertia Control Strategy Based on Improved Frequency Differential Operation[J/OL].Automation of Electric Power Systems,

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  • Received:November 30,2019
  • Revised:May 08,2020
  • Adopted:February 16,2020
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