摘要
针对用于并网逆变器的传统比例谐振(proportional resonant,PR)控制器在电网频率发生偏移时不能实现交流量零稳态误差跟踪控制的问题,提出一种适用于三相并网逆变器的具有频率自适应能力的新型谐振控制方法。在两相静止坐标系中,对基于传统准PR控制器的三相并网逆变控制系统进行改进。通过引入频率跟踪环节和前置电流反馈环节,可将整个控制系统等效为一个一阶频率随动系统。对所设计新型谐振控制系统的频率自适应动态响应性能以及稳态控制性能进行了详细理论分析,并给出关键控制参数的设计方法。最后,经仿真和实验证明了所提方案的正确性和有效性。
To solve the problem that conventional proportional resonant (PR) controller used for grid-connected inverter cannot achieve zero steady-state error tracking control when grid frequency is shifted, a new resonant control method with frequency adaptive capacity is proposed in this paper. In a two-phase static coordinate system, the three-phase grid-connected inverter control system based on traditional quasi-PR controller is improved. With introduction of frequency tracking link and pre-current feedback link, the whole control system is equivalent to a first-order frequency servo system. The frequency adaptive dynamic response and steady-state control performance of the new resonant control strategy are analyzed, and the design method of key control parameters is given. Finally, effectiveness of the proposed scheme is proved with simulation and experiment.
作者
马文杰
欧阳森
杨林
MA Wenjie;OUYANG Sen;YANG Lin(School of Electric Power, South China University of Technology, Guangzhou 510640, Guangdong Province, China)
出处
《电网技术》
EI
CSCD
北大核心
2019年第8期2884-2891,共8页
Power System Technology
基金
广东省自然科学基金(2016A030313476)~~
关键词
三相并网逆变器
谐振控制
频率自适应
three-phase grid-connected inverter
resonant control
frequency adaptability
