储能电池参与电网二次调频的高效性评估

EFFICIENCY ANALYSIS OF ENERGY STORAGE BATTERY PARTICIPATING IN SECONDARY FREQUENCY REGULATION

为给电网调频资源的优化配置提供参考,研究面向二次调频的储能电池相对于传统调频机组的高效性。阐述储能电池参与二次调频的模式,即接受区域控制误差(ACE)或区域控制需求(ARR)信号两种模式;设计调频效果的综合评价指标,并把该指标相等时储能电池与传统调频机组的容量之比定义为储能电池的高效倍数;基于含储能电池的区域电网调频动态模型,分别在阶跃扰动和连续扰动工况下仿真分析两种参与模式下的储能电池相比传统调频电源的高效程度。结果表明在阶跃扰动下,两种参与模式下的储能电池高效倍数相当,为10~25倍;在连续扰动下,基于ACE信号参与模式时储能电池高效倍数为6~8倍,而ARR模式时的储能电池高效倍数为5~6倍。

In order to provide reference for optimizing the allocation of frequency regulation resources,the efficiency of battery energy storage system(BESS)for secondary frequency regulation is researched relative to conventional frequency regulation unit.The participation modes of BESS for secondary frequency regulation are expounded,i.e.,the two modes of receiving area control error(ACE)and area regulation requirement(ARR)signal;a comprehensive index is designed for evaluating frequency regulation performance,and when the index values are equal,the ratio of capacity of conventional frequency regulation unit to capacity of BESS is defined as the efficiency multiple of BESS;based on the frequency regulation dynamic model for regional grid containing BESS,simulations under the operation conditions of step disturbance and continuous disturbance,are done,respectively,to analyze the efficiency multiples of BESS relative to conventional frequency regulation unit in the two participation modes.The results show that under the step disturbance,the efficiency multiples of BESS in the two participation modes are basically equal,about 10-25 times;under the continuous disturbance,the efficiency multiples of BESS in the participation mode based on ACE signal are about 6-8 times,while those in the ARR mode are about 5-6 times.