基于坐标变换的单相逆变电源并网控制方法  

Grid-connected control for single-phase inverter based on synchronous frame transformation

作　　者：田悦新[1] 曹海燕[1] 伞国成[2] 王怀宝[2] 

机构地区：[1]石家庄经济学院信息工程学院,河北石家庄050031 [2]燕山大学电气工程学院,河北秦皇岛066004

出　　处：《电力系统保护与控制》2009年第17期75-77,共3页Power System Protection and Control

摘　　要：传统三相逆变电源并网电流控制通常采用基于同步旋转坐标变换的PI控制实现无静差电流调节。然而,该方法不能直接应用于单相系统。通过构造虚拟正交分量,然后通过Park变换实现坐标变换,将单相交流量转换为直流量,进而通过PI控制实现无静差并网电流调节。文中分析了其工作原理,设计了电网电压同步数字锁相方案。最后进行了数字化控制并网实验。实验结果表明,提出的方法具有电流控制精度高、单位功率因数并网发电等优点,具有一定的实用价值。Traditional synchronous frame PI control is widely used in grid current control of three-phase inverters to achieve zero steady-state error. However, it can＇t straightforward be applied to single-phase system. In this paper, imaginary component is built and processed by Park transformation, which changes the AC component into DC component. Therefore, a simple PI control can eliminate the steady-state error of the grid current. Besides, the operation principle is discussed. Synchronous digital phase lock scheme is designed. Experiment with the digital control is performed, and the experimental results indicate that the proposed method has advantages of high-accuracy current control and unity power factor operation, which makes it a useful solution in practical applications.

关 键 词：并网控制 单相逆变电源 坐标变换 

分 类 号：TM464[电气工程—电器]