基于重复控制的光伏逆变器多目标协同策略  

Multi-objective Coordinated Control Strategy of PV Inverter Based on Repetitive Control

作　　者：刘凤雏 刘敏 钟华敏 李鹏 LIU Fengchu;LIU Min;ZHONG Huamin;LI Peng(Shaoguan Power Supply Bureau,Shaoguan 510000,Guangdong,China)

机构地区：[1]韶关供电局

出　　处：《电气传动》2019年第10期39-43,共5页Electric Drive

基　　金：广东电网有限责任公司科技项目(030200KK52160006)

摘　　要：为了提升不平衡电网下光伏逆变器的运行性能,提出一种α-β坐标系下基于重复控制器的多目标协同控制策略。首先,介绍了不平衡电网条件下α-β坐标中的功率、电流关系,采用一种基于并网功率指令加权分配的光伏逆变器并网功率控制策略;其次,为保证前述策略的有效实施,以及简化系统控制结构,提出采用PI并联重复的复合型控制器来实现对输出电流的准确跟踪控制;然后,基于线性叠加定理,给出整个系统的等效被控对象模型,以简化稳定补偿控制器的设计;最后,利用PSCAD仿真软件验证了所设计控制策略的正确性。For purpose of improving the operation performance of photovoltaic inverters in unbalanced grid,a multi-objective cooperative control strategy based on repetitive controller inα-βframe was proposed.Firstly,the relationship between power and current inα-βframe under unbalanced grid conditions was introduced,and a power control strategy of photovoltaic inverters based on weighted distribution of grid-connected power instructions was adopted.Secondly,in order to ensure the effective implementation of the above strategy and simplify the control structure of the system,a compound controller with PI parallel repetitive was proposed to achieve accurate tracking control of the output current.Then,based on the linear superposition theorem,the equivalent controlled object model of the whole system was given to simplify the design of the stabilization compensation controller.Finally,the PSCAD simulation software was used to verify the correctness of the designed control strategy.

关 键 词：光伏逆变器 不平衡电网 重复控制器 PSCAD仿真 

分 类 号：TM464[电气工程—电器]