摘要
微电网中采用下垂控制的逆变器对外呈现为近似电压源的特性,并经由线路阻抗连接到公共母线处。如果交流母线电压存在谐波分量,在线路阻抗较小的情况下将产生较大的谐波电流,进而降低母线电能质量,影响微电网安全有效运行,因此需对谐波电流进行相应控制。该文针对低压微电网中逆变器并联孤岛运行系统,提出采用准比例复数积分调节器进行谐波电流抑制的方法,该方法无需坐标变换,可直接针对特定次谐波电流进行控制,并且该复数调节器为一阶系统,较易于工程实现。最后通过仿真和实验对该方法进行验证。
In micro-grid the inverters with the droop control method present the characteristic of the approximate voltage source and is connected to the common bus via the line impedance. At this time,if there is a harmonic component in the AC bus voltage,a larger harmonic current will be generated under small line impedance,thereby reducing the power quality of the busbar which affects the safe and effective operation of the microgrid. Therefore,it is necessary to control the harmonic current accordingly. In this paper,a method for harmonic current suppression which uses a quasi-proportional complex integral controller,is proposed for the inverter parallel island operation system in low voltage microgrid. This method can control the specific harmonic current directly without the change of coordinates,and the complex controller is a first order system,which is easier to implement in engineering. Finally,the method is verified by simulation experiment.
作者
王晓寰
庆宏阳
刘聪哲
张纯江
Wang Xiaohuan;Qing Hongyang;Liu Congzhe;Zhang Chunjiang(Key Lab of Power Electronics for Energy Conservation and Motor Drive of Hebei Province(College of Electrical Engineering,Yanshan University),Qinhuangdao 066004,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2020年第3期167-176,共10页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(51607154)
河北省自然科学基金(E2016203357,E2018203152)
河北高校基金(QN2017362)。
关键词
电力逆变器
谐波分析
电能质量
微电网
准比例复数积分调节器
electric inverters
harmonic analysis
power quality
micro-grid
quasi-proportional complex integral controller
作者简介
通信作者:王晓寰(1980-),女,博士、副教授、硕士生导师,主要从事双模式逆变器及控制、光伏分布式发电系统、微电网系统运行控制及孤岛检测方面的研究。wxh@ysu.edu.cn。
