摘要
光伏渗透率较高的微电网,由于系统惯性降低而造成微电网调频困难。为提高微电网调频能力,在考虑负荷电压静态特性的基础上,提出了电压频率控制(voltage based frequency control,VFC)频率控制策略,该策略通过调节负荷处母线电压改变负荷功率需求以协助微电网频率调节。首先,在DIgSILENT仿真软件中对光储微电网频率控制进行了建模;然后,将频率波动信号进行频域分解,并将高低中调频信号分配给微电网中储能、VFC控制器、柴油机,让其承担不同的调频任务;最后,分析了不同电源的调频能力。仿真结果表明,VFC控制策略能有效提高微电网频率稳定性,延长储能在微电网中的放电时间。
In microgrid with high PV penetration,it is difficult to adjust frequency of microgrid due to low system inertia.In order to improve the frequency modulation capability of microgrid,a voltage based frequency control(VFC)frequency control strategy is proposed based on the static characteristics of load voltage.The strategy changes the load power demand by adjusting the bus voltage at the load to assist the frequency regulation of microgrid.Firstly,the frequency control model of optical storage microgrid is established in DIgSILENT simulation software.Then,the frequency fluctuation signal is decomposed in frequency domain,and the high and low frequency modulation signals are distributed to energy storage,VFC controller and diesel engine in microgrid to undertake different frequency modulation tasks.Finally,the frequency modulation ability of different power sources is analyzed.The simulation results show that VFC control strategy can effectively improve the frequency stability of microgrid and prolong the discharge time of energy storage in microgrid.
作者
黄阮明
王海群
张铭泽
李灏恩
屈靖雅
赵晶晶
HUANG Ruanming;WANG Haiqun;ZHANG Mingze;LI Haoen;QU Jingya;ZHAO Jingjing(Electric Power Economic Research Institute,State Grid SMEPC,Xuhui District,Shanghai 200223,China;College of Electrical Engincering,Shanghai University of Electric Power,Yangpu District,Shanghai 200090,China)
出处
《分布式能源》
2020年第6期1-6,共6页
Distributed Energy
关键词
储能
负荷
电压调节
频率控制
微电网
energy storage
load
voltage regulation
frequency control
microgrid
