基于改进RoCoF测量方法的储能辅助光伏机组快速调频策略

doi:10.19595/j.cnki.1000-6753.tces.210610

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摘要大规模光伏机组并网导致电力系统面临惯性下降与调频能力不足的问题。现有的有功备用方案虽然可以满足一次调频的需求,但难以提供惯量支撑,且弃光运行会影响发电效益。为此,提出一种储能辅助光伏机组实现虚拟惯量和一次调频的协调控制策略,在保证光伏发电效益的同时能够减少一半的储能容量。所提策略通过光伏变功率跟踪响应频率上扰、储能装置响应频率下扰的方式进行一次调频,并控制储能装置为系统提供惯量支撑。构建数学模型揭示由锁相环测量频率变化率（RoCoF）引发惯性功率跌落的本质原因,据此提出了运用一阶高通环节对频率变化率测量值进行修正的方法,以提升虚拟惯量控制效果。通过微电网算例仿真对比分析了有功备用控制和所提协调控制的频率调节效果,结果表明协调控制策略性能更优。

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关键词 ：变功率跟踪, 储能装置, 协调控制, 频率调节, 光伏发电, 锁相环

Abstract：Large-scale photovoltaic (PV) grid-connected power generation causes a power system to face the problem of inertia decline and insufficient frequency regulation capability. Although the current scheme of active power reserve (APR) can meet the needs participating in primary frequency regulation, it is difficult to provide inertia support and the operation of abandoned solar energy will affect generation benefits. Accordingly, a coordinated control strategy of virtual inertia and primary frequency regulation for energy-storage assisted PV system is proposed. The proposed strategy reduces energy storage capacity by half without losing power generation benefits. The primary frequency regulation is accomplished by the means that variable power point tracking (VPPT) responses frequency’s up disturbance and energy storage equipment responses frequency’s down disturbance. Moreover, energy storage device is used for inertia support control. The essential reason of inertia-power sag caused by the measurement of rate of change of frequency (RoCoF) is revealed through mathematical modeling, and a method to correct the measurement value of RoCoF by the first-order high-pass link is proposed to improve the inertia control effect. The control effects of the proposed strategy and the APR strategy are compared and analyzed in simulation example of microgrid. The results show that the coordinated strategy has better performance.

Key words： Variable power point tracking energy storage device coordinated control frequency regulation photovoltaic power generation phaselocked loop(PLL)

收稿日期: 2021-04-29

PACS:

TM732

基金资助:国网河北省电力公司科技项目（SGHEDK00JYJS2100145）和北京市自然科学基金项目（3212037）资助

通讯作者: 湘武男,1965年生,教授,博士生导师,研究方向为新能源电力系统分析与控制、现代电力变换、新型储能与节能技术。E-mail：xiangwuy@ncepu.edu.cn

作者简介: 贾焦心男,1991年生,博士,讲师,研究方向为微电网运行及接口变换器控制、新能源发电系统建模和控制。E-mail：jiajx33@163.com

引用本文:

贾焦心, 颜湘武, 李铁成, 王俣珂, 马宏斌. 基于改进RoCoF测量方法的储能辅助光伏机组快速调频策略[J]. 电工技术学报, 2022, 37(zk1): 93-105. Jia Jiaoxin, Yan Xiangwu, Li Tiecheng, Wang Yuke, Ma Hongbin. Fast Frequency Regulation Strategy of PV Power System Assisted by Energy Storage Based on Improved Measurement Method of RoCoF. Transactions of China Electrotechnical Society, 2022, 37(zk1): 93-105.

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