Abstract：After large-scale wind turbines and energy storage are connected to the grid, the inertia of the system will be seriously weakened, affecting the stable and safe operation of the frequency. The decoupling characteristics of rotational speed and frequency of DFIG make it unable to respond to the frequency changes of the grid. As a stationary non-rotating component, the energy storage does not have the inertia response capability of the synchronous generator. To improve the virtual inertia support function of new energy high penetration regional grid, this paper uses the energy of wind turbine and energy storage to broaden the inertia source for the system, reasonably allocates the frequency regulation tasks of wind turbine and energy storage in the inertia response period, and proposes a wind turbine-storage virtual inertia cooperative support control method based on the frequency safety demand. Firstly, the frequency response of DFIG and battery is analyzed, the virtual inertia of DFIG and battery is defined, and the frequency response model of the system with virtual inertia is established. Then, the effect of virtual inertia control on the frequency characteristics of the system is analyzed, a method for calculating the inertia response time of the system is proposed,which is used as a start-stop condition for virtual inertial control, and the inertia requirement of the system is evaluated , which is based on the safety constraint of rate of change of frequency. Finally, a collaborative wind-storage virtual inertia control strategy based on the inertia demand of system is proposed, the frequency modulation tasks of the wind and storage energy are reasonably allocated, the controller parameters are completed, and the inertia response time is used to block the controller in time, effectively avoiding the frequency overshoot problem. Simulation analysis of the proposed virtual inertia cooperative support control strategy shows that, under the proposed control strategy, when the disturbance power is small, the inertia response capability of the wind turbine is given full play, without the need for additional energy storage to respond to frequency changes, reducing the number of energy storage charges and discharges,which is conducive to extending the service life of the energy storage; When the disturbance power is large, the wind turbine and energy storage jointly participate in frequency regulation, and the energy storage starts the virtual inertia control to make up for the power shortage, which meets the frequency support demand by reasonably calling the inertia reserve of the wind turbine and energy storage, and the wind storage virtual inertia additional controller can be withdrawn in time within the specified time, which reduces the overshoot in the frequency recovery process and effectively improves the frequency stability and safety. The following conclusions can be drawn from the simulation analysis: (1) Wind power and energy storage using virtual inertia controller can simulate the inertia response of synchronous generator units, but virtual inertia control has a negative impact on the frequency response characteristics during the frequency recovery period, and there is a frequency overshoot problem, which is not conducive to frequency recovery. (2) The inertia response time can be used as a blocking condition for the wind storage virtual inertia controller, and the virtual inertia control of both wind turbine and energy storage can be withdrawn in time under the proposed time, which effectively avoids the frequency fluctuation problem caused by inertia overshoot during the frequency recovery period.(3) Under the proposed virtual inertia cooperative control strategy, the frequency modulation tasks of the wind and storage energy are reasonably allocated to meet the minimum inertia demand of the system, which fully releases the potential of wind power and energy storage to support the frequency. By simulating and comparing the frequency regulation effect when no additional control, conventional differential control and wind-storage virtual inertia cooperative control, it is verified that the proposed control can meet the frequency support requirement more reliably under the premise of reasonable invocation of wind-storage inertia reserve.
张祥宇, 胡剑峰, 付媛, 金召展. 风储联合系统的虚拟惯量需求与协同支撑[J]. 电工技术学报, 2024, 39(3): 672-685.
Zhang Xiangyu, Hu Jianfeng, Fu Yuan, Jin Zhaozhan. Virtual Inertia Demand and Collaborative Support of Wind Power and Energy Storage System. Transactions of China Electrotechnical Society, 2024, 39(3): 672-685.
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2024, Vol. 39 
