摘要
针对三相四线制有源电力滤波器(APF)因采用外部A/D有延时现象,致使滞环控制不准确的问题,提出了一种新的滞环控制方式。通过设置一个新带宽,进行有无死区的判断:若补偿电流在带宽范围内和过零时则死区存在,否则死区不存在;再按照一般的滞环控制方式产生PWM驱动信号,从而达到抑制开关管开关延时和死区延时的效果。仿真和试验结果均表明,该算法的优越性明显,电流补偿效果好。
In view of the time delay phenomenon of three-phase four-wire system active power filter when exterior A/D is used,which makes control inaccurate,a new hysteresis current control strategy is proposed.A new band width is established, which is used to judge whether there is a dead area.When the compensation current is in bandwidth range and zero crossing,the dead area exists,otherwise it exits.Then the general hysteresis control method is used to produce PWM driving signal and to achieve the effect of restraining switch time delay and the dead area time delay,The simulative and the test results indicate that the superiority of this algorithm is obvious and the current compensation effect is good.
出处
《电力电子技术》
CSCD
北大核心
2009年第10期27-28,共2页
Power Electronics
