基于锁相环和虚拟电网磁链的三相并网逆变器  

Three-Phase Grid-Connected Inverters Based on PLL and Virtual Grid Flux

作　　者：杨勇[1] 阮毅[1] 汤燕燕[1] 叶斌英[1] 

机构地区：[1]上海大学机电工程与自动化学院,上海200072

出　　处：《电工技术学报》2010年第4期109-114,共6页Transactions of China Electrotechnical Society

基　　金：台达环境与教育基金会<电力电子科教发展计划>资助项目(DRES2007002)

摘　　要：为了提高三相并网逆变器的可靠性、降低并网逆变器的成本,提出一种基于锁相环和虚拟电网磁链的无电网电压传感器的控制策略。根据三相并网逆变器在同步旋转坐标系下的动态数学模型,采用虚拟的电网磁链矢量定向的矢量控制和d、q轴电流双闭环控制,实现了d、q轴电流的解耦控制,使q轴电流控制有功功率,d轴电流控制无功功率。实验结果表明,三相并网逆变器输出电流正弦度良好,谐波含量小,同时有很好的动、静态特性,从而验证了该方案的可行性和正确性。In order to improve reliability and reduce cost for three-phase grid-connected inverters, this paper proposes a novel control strategy based on phased lock loop （PLL） and virtual grid flux without grid voltage sensors. According to the dynamic mathematical model in synchronous rotating frame for three-phase grid-connected inverters, the virtual grid flux vector orientation and d-axis current and q-axis current close-loop control are used, which achieves the decoupling control for d-axis current and q-axis current. The active power and the reactive power for three-phase grid-connected inverters are independently controlled by q-axis current and d-axis current. Experimental results show that the output currents are sinusoidal with less distortion and it has a good dynamic and static performance. So the feasibility and correctness for the control strategy is verified.

关 键 词：锁相环 虚拟电网磁链 无电网电压传感器 解耦控制 电流闭环 

分 类 号：TM464[电气工程—电器]