电池储能参与传统第三道防线频率调整的协调控制策略

Coordinated Control Strategy of Frequency Regulation Through Battery Energy Storage System Participate in the Traditional Third Defense Line

针对传统第三道防线难以应对低惯量电力系统频率突变的问题,提出一种电池储能参与传统第三道防线频率调整的协调控制策略。通过分析不同惯量水平下第三道防线触发条件的变化,揭示系统惯量水平对传统第三道防线频率调整的影响。建立含触发、功率分配和荷电状态限制3个模块的储能系统参与第三道防线的频率调整控制模型。利用功率分配协调控制模块对不同状态的储能组进行频率响应信号分配,充分利用各组储能的可调节容量。通过荷电状态限制模块对储能的实际充放功率进一步优化,减缓储能到达容量阈值限制的速度。案例分析表明,所提控制策略可有效提高传统第三道防线频率调整的响应效果,并为传统第三道防线的触发条件优化提供了理论参考。

A coordinated control strategy for frequency regulation by a battery energy storage system participating in the traditional third defense line is proposed to address the problem of the traditional third defense line hardly coping with sudden frequency changes in low-inertia power systems.The influence of the inertia level on the frequency regulation of the third defense line is revealed by analyzing the variation of the third defense line triggering conditions at different inertia levels.A frequency regulation control model for battery energy storage system participation in the third defense line contains three modules:trigger,power allocation,and state of charge limitation.The power allocation coordination control module is used to allocate frequency response signals to energy storage groups in different states,making full use of each energy storage group's adjustable capacity.The state of charge limitation module further optimizes the energy storage's actual charging and discharging power to prevent the energy storage capacity from rapidly reaching the threshold value limits.The case study shows that the proposed control strategy can effectively improve the frequency regulation response of the third defense line and provides a theoretical reference for optimizing the trigger conditions of the traditional third defense line.