CAJ | 학술논문

为解决三桥臂电容中点式三相四线有源电力滤波器存在的上下桥臂直流侧电压不平衡的问题和启动过程中直流侧电压超调的问题，提出一种三闭环控制策略。通过分析直流侧电压对控制系统的影响，纹波产生的原因，提出直流侧电压的控制指标。在分析直流侧电压与能量交换的关系的基础上，提出一种直流侧电压均压控制方法。针对直流侧总电压在启动过程中的超调问题给出解决方案，给出一种软启方案控制超调，并在大负载和小负载两种情况提出不同控制方案。最后通过实验数据，对这些控制方案进行了验证。
위해결삼교비전용중점식삼상사선유원전력려파기존재적상하교비직류측전압불평형적문제화계동과정중직류측전압초조적문제，제출일충삼폐배공제책략。통과분석직류측전압대공제계통적영향，문파산생적원인，제출직류측전압적공제지표。재분석직류측전압여능량교환적관계적기출상，제출일충직류측전압균압공제방법。침대직류측총전압재계동과정중적초조문제급출해결방안，급출일충연계방안공제초조，병재대부재화소부재량충정황제출불동공제방안。최후통과실험수거，대저사공제방안진행료험증。
To deal with DC voltage unbalance on two arms and the total DC voltage overshoot during startup, three closed loops control strategy of three-phase four-wire active power filter (APF) is shown. The influence of DC voltage on the APF and the origin of DC voltage ripple is analyzed. Besides the DC voltage control targets are presented. Based on the relationship of DC voltage and energy exchange, a method of DC voltage balance on two arms is proposed. A solution is given about the total DC voltage overshoot during startup. As the difference under heavy load and light load, control strategies are selected respectively. At last, experiment is done to verify the principle above.