储能参与电网辅助调频的协调控制策略研究*

doi:10.11985/2021.03.015

摘要/Abstract

摘要：

传统的水、火电调频机组因其固有缺陷难以克服风电、光伏等间歇式新能源大规模并网引起的电网调频容量不足问题,而储能以其快速的响应特性在调频方面具有天然优势,将储能引入到电网调频中可显著改善其调频效果。因此针对储能参与电网辅助调频的控制策略展开研究,建立了储能以及含储能的区域电网调频等效模型;基于该模型,将储能的荷电状态(State of charge,SOC)考虑在内,并对电网频率偏差和储能的SOC进行分区,提出了一种储能与传统调频机组参与电网频率调节的协调控制策略;搭建仿真模型对所提控制策略进行验证。仿真结果表明,所提控制策略能够有效改善电网调频特性。

关键词: 间歇式新能源, 储能, 电网调频, 荷电状态, 协调控制

Abstract:

Because of its inherent defects, traditional water and thermal frequency regulation units are difficult to overcome the problem of insufficient frequency regulation capacity of power grid caused by large-scale grid-connected intermittent new energy sources such as wind power and photovoltaics, and energy storage has a natural advantage in frequency regulation due to its rapid response characteristics. The frequency regulation effect can be improved by introducing energy storage into power grid frequency regulation. Therefore, the control strategy of energy storage participating in grid auxiliary frequency regulation is studied. Firstly, an equivalent model of energy storage and regional power grid frequency regulation with energy storage is established; Then, based on the model, the state of charge (SOC) of energy storage is taken into account, and the frequency deviation of the power grid and the SOC of energy storage are partitioned, a coordinated control strategy for energy storage and traditional frequency regulation units participating in grid frequency regulation is proposed; Finally, a simulation model is built to verify the proposed control strategy, the simulation results show that the proposed control strategy can effectively improve the frequency regulation characteristics of the power grid.

Key words: Intermittent new energy sources, energy storage, grid frequency regulation, state of charge, coordination control

中图分类号:

TM73

彭鹏, 胡振恺, 李毓烜, 刘泽健, 范紫微. 储能参与电网辅助调频的协调控制策略研究^*[J]. 电气工程学报, 2021, 16(3): 106-114.

PENG Peng, HU Zhenkai, LI Yuxuan, LIU Zejian, FAN Ziwei. Research on Coordination Control Strategy of Frequency Regulation in Grid with Energy Storage[J]. Journal of Electrical Engineering, 2021, 16(3): 106-114.

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参数	数值
发电机组调速器时间常数T_G/s	0.08
汽轮机时间常数T_T/s	0.3
系统惯性时间常数M/s	8
负荷频率特性系数D	4
发电机组的单位调节功率K_g	25
频率死区f_death/Hz	0.033

工况	频率偏差/Hz	传统调频机组出力/kW	储能出力/kW	稳态时间/s
无储能	0.36	8.2	0	2.6
有储能	0.13	3.8	6	0.8

工况	频率偏差/Hz	传统调频机组出力/kW	储能出力/kW
无储能	0.48	8.5	0
有储能	0.15	3.0	8