CAJ | 학술논문

在单相级联脉冲宽度调制(pulse width modulation， PWM)整流器中，直流电压不平衡情况下的均压控制要求较高，控制性能受锁相环影响较大。为此，提出了一种应用于单相级联PWM整流器中的无锁相环控制策略。利用在两相静止坐标系下瞬时功率与电压、电流的关系计算出指令电流信号，以实现电网电流对电压的跟踪控制；此外，叠加无锁相环均压指令，实现各级均压控制；同时采用准比例谐振控制器实现电流内环无静差控制。仿真结果验证了该无锁相环控制策略的有效性。
재단상급련맥충관도조제(pulse width modulation， PWM)정류기중，직류전압불평형정황하적균압공제요구교고，공제성능수쇄상배영향교대。위차，제출료일충응용우단상급련PWM정류기중적무쇄상배공제책략。이용재량상정지좌표계하순시공솔여전압、전류적관계계산출지령전류신호，이실현전망전류대전압적근종공제；차외，첩가무쇄상배균압지령，실현각급균압공제；동시채용준비례해진공제기실현전류내배무정차공제。방진결과험증료해무쇄상배공제책략적유효성。
ABSTRACT:As for single-phase cascaded pulse width modulation (PWM) filter since the control performance is sensitive to the phase-lock loop, so there is a higher demand on the voltage sharing control under the unbalanced DC voltage. For this reason, a phase-lock loopless control strategy applied in single-phase cascaded PWM filter is proposed. Utilizing the relations among instantaneous power, voltage and current in two-phase static coordinate system the instruction current signal is calculated to implement the real-time tracking of grid current to grid voltage. Besides, phase-lock loopless voltage sharing instruction signals of different levels in the cascaded PWM filter are superposed to the modulation signals respectively to correct power imbalance quantities in corresponding levels of the cascaded PWM filter to implement the voltage sharing control of different levels, meanwhile, the quasi-proportional resonant controller is used to implement the astatic control of current inner loop. The validity of the proposed phase-lock loopless control strategy is verified by simulation results.