单相串联电压质量补偿器控制器的研究

CONTROL METHOD OF SINGLE PHASE SERIES VOLTAGE QUALITY COMPENSATOR

为了抑制系统电压的跌落和消除电压谐波 ,提出了利用串联逆变器进行电压质量控制。串联逆变器直接耦合结构的使用可以提高系统的效率和补偿性能。文中还提出了通过输出电压直接反馈来控制用户侧电压的新方法。利用经典控制理论的方法建立了串联补偿器的传递函数模型 ,并且对由瞬时电容电流反馈和输出电压瞬时值反馈构成的双环反馈控制方式进行了动态特性的分析。分析结果表明 :采用该方法可以大大提高系统动态特性 ,有效抑制系统电压的跌落和消除电压谐波。文中还提出了采用 6开关智能IPM模块构成的两种实际电路结构 。

A novel serial connected AC voltage controller is presented to compensate the voltage sag and restrain the voltage harmonic. A series inverter is inserted directly into the system. This structure provides higher efficiency and better compensating characteristics. The output voltage feedback method is also used to control the user-side voltage directly. The system transfer function model is set up based on the classical control method. The analysis of control strategy, which consists of an inner capacitor current feedback loop and a outer voltage feedback loop, shows that the control method provided a better dynamic response of the system and can eliminate voltage harmonic and compensate voltage sag effectively. Two possible circuit structures based on six switches IPM (intelligent power module) are also put forward. The experimental results verified the analysis.