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| Coordinated Frequency Modulation Control Strategy of Wind Farm-Storage System Based on Virtual Synchronous Generator Technology |
| Zhang Guanfeng1,2, Yang Junyou1, Wang Haixin1, Xie Cijian2, Fu Yao2 |
1. School of Electrical Engineering Shenyang University of Technology Shenyang 110870 China;
2. Liaoning Dongke Power Co. Ltd Shenyang 110003 China |
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Abstract In order to fully explore the frequency regulation capability of wind turbine and consider the shortcomings of traditional frequency modulation control strategy that the energy storage system (ESS) directly compensates the wind farm's secondary frequency drop, such as the high ESS capacity requirements and poor economy, a coordinated frequency regulation control strategy based on virtual synchronous generator (VSG) technology is proposed by the paper. Firstly, based on the structure of wind farm-ESS VSG system, the mathematical model of wind farm-ESS VSG is established, and the frequency modulation characteristics of wind storage VSG are analyzed. Secondly, according to the mathematical model of ESS, the state of charge (SOC) is considered. Then, considering the output characteristics of wind farm and ESS, a coordinated control strategy based on wind power inertia release and ESS steady-state support is proposed. By means of parallel output of wind farm and ESS, the short-term power support function of wind turbine can be brought into full play and the capacity demand of ESS is reduced. The simulation results show that the control strategy in the paper can greatly reduce the capacity configuration of ESS and improve the efficiency of wind farm frequency modulation on the basis of stabilizing the system frequency.
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Received: 09 July 2020
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2022, Vol. 37 
