【摘要】 在各次谐波对应的同步旋转坐标系下,采用比例积分(proportion integration,PI)调节器对网侧各次谐波电流进行分次闭环控制,以有效消除采样精度、控制延时、脉冲宽度调制(pulse width modulation,PWM)死区等对补偿效果造成的影响,实现无静差补偿;在此基础上,针对负载中包含并联电容器时有源电力滤波器的稳定性问题,采用等效系统的方法进行了分析,并基于分次闭环控制提出了简单易行解决方案。数字仿真和物理试验验证了所提控制方法的的有效性。更多还原

【Abstract】 In synchronous rotating coordinate systems corresponding to various orders of harmonics,the proportion integration(PI) regulators are used to compensate various orders of harmonics by closed-loop control of grid-side current to effectively eliminate the affections of sampling precision,control system delay,dead zone of pulse width modulation(PWM) on compensation effect to implement the control with zero steady-state error.On this basis,in allusion to the stability of active power filter when shunt capacitor is contained in the load,the analysis is performed by equivalent system.By adopting order-based closed-loop control,a solution that is simple and easy to realize is given.Results of digital simulation and physical experiments show that the proposed control method is effective.更多还原