论文部分内容阅读
电压源型逆变器(voltage source inverters,VSI)通常使用电压电流双闭环控制,也有新型的单电压环控制被提出;同时为了抑制低次谐波,一般引入并联的谐振控制器结构。首先从传递函数的角度,详细对比双环和单环控制,得出开关频率较低时,两种控制策略的动态性能差别不大的结论;“,”Voltage Source Inverters (VSI) commonly use the double loop control strategy, while new single loop control strategies have been proposed. In order to suppress the low-order harmonics, parallel resonant controllers are also introduced. This paper firstly makes a comparison of single loop and double loop control strategies, as viewed from transfer functions, and concludes that these two control strategies have almost the same dynamic response under low switching frequencies. Then deep analysis is carried out on problems existing in the present parallel resonant controllers design. On this basis, a novel single loop control strategy based on phase lead correction is proposed. It can simplify the control parameters designing, and dramatically improves the performance of VSI by adjusting the magnitude-phase characteristics of the controlled object. The analysis and experimental results show that the novel single-loop controller maintains low total harmonic distortion content and fast transient response.