摘要
随着分布式电源(DG)渗透率的不断提高,配电网易发生多DG孤岛效应,为了保证电能质量和用电安全,逆变器必须具备孤岛检测功能。针对多DG逆变器因注入扰动量的方向相反而产生稀释效应,导致传统孤岛检测方法失效的问题,提出了一种基于逆变器定频率控制的孤岛检测新方法。该方法利用正弦脉宽调制技术将其中一台逆变器输出电压的频率控制为50 Hz,通过该定频率控制的主逆变器稳定孤岛频率,使得锁相环控制的各从逆变器恢复正常运行状态,消除稀释效应,实现多DG孤岛检测。最后,利用MATLAB/Simulink进行仿真,验证了该方法的有效性。
As the penetration rate of distributed generators(DGs) keeps increasing, the islanding effect of multiple DGs is likely to occur in the distribution network. In order to ensure power quality and power safety, the inverter must have the islanding detection function. To solve the problem of dilution effect caused by the opposite direction of injected disturbance of the multi-DG inverter,which would lead to the failure of the traditional islanding detection method, this paper proposes a new islanding detection method based on the fixed frequency control of inverters. This method uses the sinusoidal pulse width modulation technology to control the frequency of the output voltage of one of the inverters to 50 Hz. The islanding frequency is stabilized by the master inverter controlled to the fixed frequency, so that each slave inverter controlled by the phase-locked loop can be restored to the normal operation state to eliminate the dilution effect, and the islanding of multiple DGs is detected. The effectiveness of the method is verified by the simulation on the MATLAB/Simulink.
作者
张军
张新慧
黄超艺
尹凡
王苏蓬
吴文浩
ZHANG Jun;ZHANG Xinhui;HUANG Chaoyi;YIN Fan;WANG Supeng;WU Wenhao(School of Electrical and Electronic Engineering,Shandong University of Technology,Zibo 255000,China;State Grid Quanzhou Power Supply Company,Quanzhou 362100,China;East China Branch of State Grid Corporation of China,Shanghai 200002,China)
出处
《电力系统自动化》
EI
CSCD
北大核心
2022年第4期123-131,共9页
Automation of Electric Power Systems
基金
国家电网有限公司总部科技项目(5213302000G1)。
关键词
配电网
多分布式电源
孤岛检测
逆变器定频率控制
稀释效应
无功功率扰动
distribution network
multiple distributed generators
islanding detection
fixed frequency control of inverter
dilution effect
reactive power disturbance
