非线性负载下单相逆变电源电压波形控制策略  

Voltage control strategy for single-phase inverter with nonlinear load

作　　者：任碧莹[1] 孙凯歌 孙向东[1] REN Biying;SUN Kaige;SUN Xiangdong(School of Automation and Information Engineering, Xi＇an University of Technology, Xi＇an 710048, China)

机构地区：[1]西安理工大学自动化与信息工程学院,陕西西安710048

出　　处：《西安理工大学学报》2017年第4期396-401,共6页Journal of Xi'an University of Technology

基　　金：国家自然科学基金资助项目(51477139);陕西省自然科学基金资助项目(2017JM5075)

摘　　要：微电网中存在大量非线性负载,会对公共交流母线电压造成谐波污染,因此需对各分布式电源采取有效的电压波形控制技术。本文设计了具有频率带宽的准比例复数积分(QPCI)控制器,并在此基础上提出在基波、3次谐波和5次谐波处通过多个QPCI控制进行特定次交流信号的无差跟踪,同时引入负载电流前馈控制,降低逆变器谐波电流在电感上的谐波压降,进一步提高该分布式电源逆变器输出电压的电能质量。分别对比例积分(PI)控制器,多个QPCI控制器及引入中低频段的负载电流前馈的电压控制技术进行实验对比,结果表明,所提出的控制策略具有交变信号零稳态误差跟踪性能和抗干扰性能,并可以有效抑制谐波电流,改善逆变器的输出电压质量。There are a lot of nonlinear loads in the microgrid（MG）, which causes harmonic pollu- tion to the common AC bus voltage. So it is necessary to design the reasonable voltage controller for each distributed generation to improve the voltage quality. The quasi-proportional complex in- tegral （QPCI） controller with frequency bandwidth is designed in this paper with multiple QPCI controllers adopted to track fundamental, 3rd and 5th harmonic signals with zero error at these frequencies in this paper. Also, the load current feed-forward control at low and middle frequency bands is introduced to decrease the harmonic voltage drop, which can improve the voltage quality of the distributed inverter. Simulation and experiments are carried out with the voltage control strategies including the proportional integral （PI） controller and multiple QPCI controllers with feed-forward load respectively. The results show that the proposed control strategy has the abili- ty of track the AC signals with zero steady-state error tracking and anti-interference capability. Meanwhile the harmonic current can be suppressed effectively, with the output voltage quality of the inverter improved.

关 键 词：准比例复数积分控制器 逆变电源 电压质量 谐波抑制 

分 类 号：TM464[电气工程—电器]