Energy Storage Science and Technology

   

Virtual inertia optimization strategy for energy storage power plants considering multiple deadband

Zhiyong Hu1(), Zhibo Huang1, Bo Wang1, Yanping Wang1, Lei Shi2(), Xiangzhen Yang2   

  1. 1.State Grid Nanyang Power Supply Company, Nanyang 473000
    2.School of Electrical And Automation Engineering, Hefei University of Technology, Hefei 230000
  • Received:2024-12-13 Revised:2025-01-27
  • Contact: Lei Shi E-mail:zyhu1980@163.com;eeshilei@163.com

Abstract:

Optimizing and regulating the virtual inertia of energy storage stations is an effective measure to improve the overall inertia level of the power system and maintain frequency safety, in response to the problem of insufficient inertia in high proportion power electronic new power systems. The nonlinear links generated by the deadband of synchronous units and energy storage plants have a significant impact on the frequency response characteristics of the system, thus degrading the optimization results of the virtual inertia of energy storage plants. Because the deadband range and virtual inertia of the energy storage power station are flexible and adjustable, there is a lack of quantitative analysis of virtual inertia and system frequency under the action of different energy storage deadband. In order to solve this problem, this paper first constructs a system power frequency characteristic model considering the effects of energy storage, traditional synchronous machine deadband and virtual inertia. By analyzing the dynamic time-domain response of the system frequency, the influence of virtual inertia parameters on frequency safety indicators in energy storage control was explored. Next, based on this model, an improved particle swarm optimization algorithm is used to optimize the virtual inertia and improve the frequency index of the system. Finally, through sim-ulation verification, the virtual inertia optimization strategy considering multiple deadband has higher reliability and accuracy, can effectively reduce the maximum frequency deviation of the system, and thus enhance the frequency security of the system.

Key words: Energy Storage power station, deadband, Virtual inertia, frequency security, parameter optimization

CLC Number: