CAJ | 학술논문

为实现不平衡负载情况下无功和负序的同时补偿，详细分析了基于模块化多电平换流器的静止同步补偿器(modular multilevel converter-static synchronous compensator， MMC-STATCOM)负序补偿的工作原理，将指令电流信号与实际输出电流相比较产生的三相误差信号变换到两相静止坐标系下，采用比例谐振控制器控制，实现电流无静差跟踪，减小了控制系统复杂程度。针对传统二倍频环流抑制方法的复杂性，提出了基于系统小信号模型的环流抑制方法，该方法针对每一相进行单独控制，适用性广泛。仿真结果验证了所提控制方法的可行性。
위실현불평형부재정황하무공화부서적동시보상，상세분석료기우모괴화다전평환류기적정지동보보상기(modular multilevel converter-static synchronous compensator， MMC-STATCOM)부서보상적공작원리，장지령전류신호여실제수출전류상비교산생적삼상오차신호변환도량상정지좌표계하，채용비례해진공제기공제，실현전류무정차근종，감소료공제계통복잡정도。침대전통이배빈배류억제방법적복잡성，제출료기우계통소신호모형적배류억제방법，해방법침대매일상진행단독공제，괄용성엄범。방진결과험증료소제공제방법적가행성。
The working principle of negative sequence current compensation in modular multilevel converter based static synchronous compensator (MMC-STATCOM) is analyzed, and to reduce the complexity of control system the three-phase current error signal obtained from the comparison of the regulating current signal with actual output current is transformed into two-phase rest frame and proportional-resonant controller is adopted to implement the astatic current tracking. In allusion to the complexity of traditional method to restrain two-fold frequency circulating current, a system small-signal model based circulating current suppressing method is proposed, and in view of the feature of the proposed control method that the current of each phase is controlled individually this method can be widely applied. The feasibility of the proposed control method is validated by simulation results.