单相并网逆变器自适应比例复数积分控制策略  

Adaptive Proportional Complex Integral Control Strategy for Single-phase Grid-connected Inverter

作　　者：杨浩 宋国杰 滕馥遥 李红 陈延明[1] YANG Hao;SONG Guojie;TENG Fuyao;LI Hong;CHEN Yanming(School of Electrical Engineering,Guangxi University,Nanning 530000,China)

机构地区：[1]广西大学电气工程学院,南宁530000

出　　处：《高电压技术》2020年第11期3790-3799,共10页High Voltage Engineering

基　　金：国家自然科学基金(51567004);广西省重点研发计划(AB18126026)。

摘　　要：当弱电网频率漂移时,传统控制器不能无差跟踪电网频率和实现并网电流的零稳态误差控制。为此,提出一种单相并网逆变器的自适应比例复数积分(proportional complex integral, PCI)控制策略,该策略采用基于复数域的比例复数积分控制与锁频环(frequency-locked loop, FLL)相结合的自适应控制方法,其中PCI控制器用于消除并网电流的稳态误差,FLL用于实时跟踪电网频率,提高PCI的控制精度。仿真和样机实验表明,该控制策略能在电网频率波动下,实现并网电流无差跟踪给定信号,同时降低并网电流的谐波含量。论文研究可为改善单相并网逆变器在频率漂移下的控制性能提供参考。When the frequency of weak grid drifts, traditional controllers cannot track the grid frequency without error and achieve zero steady-state error control of the grid-connected current. To this end, an adaptive proportional complex integral(PCI) control strategy for single-phase grid-connected inverters is proposed. This strategy uses an adaptive control method that combines complex-number domain-based proportional complex integral control with frequency-locked loop(FLL), where the PCI controller is used to eliminate the steady-state error of the grid-connected current, and the FLL is used to track the grid frequency in real time to improve the control accuracy of PCI. The simulation and prototype experiments show that the control strategy can achieve grid-connected current tracking the given signal without difference under grid frequency fluctuations, while reducing the harmonic content of grid-connected current. The research in this paper can provide references for improving the control performance of single-phase grid-connected inverter under frequency drift.

关 键 词：并网逆变器 比例复数积分 锁频环 自适应 谐波 零稳态误差 频率漂移 

分 类 号：TM464[电气工程—电器]