CAJ | 학술논문

直流侧电压的大小和变化将直接影响有源电力滤波器（APF）的补偿性能。经过对功率模型的数学推导，得出通过注入零序电压可以有效地控制各级联 H 桥相相之间直流侧电压的平衡；同时对模块间电压不平衡及电网电压不平衡下导致的直流侧电压不平衡原因进行了分析；最后结合直流侧全局稳压和模块间均压，构成电压的三层控制，实现了电压均衡和稳定，在电网不平衡的情况下也可以起到较好的效果。仿真结果验证了所提控制策略的有效性。
직류측전압적대소화변화장직접영향유원전력려파기（APF）적보상성능。경과대공솔모형적수학추도，득출통과주입령서전압가이유효지공제각급련 H 교상상지간직류측전압적평형；동시대모괴간전압불평형급전망전압불평형하도치적직류측전압불평형원인진행료분석；최후결합직류측전국은압화모괴간균압，구성전압적삼층공제，실현료전압균형화은정，재전망불평형적정황하야가이기도교호적효과。방진결과험증료소제공제책략적유효성。
The size and the changes of DC side voltage will directly affect the compensation performance of active power filter(APF).The pulse delay,the difference loss of active power and other factors will lead to the voltage imbalance of each module and each phase of cascaded H bridge APF.By analyzing the power model,this paper obtained that the strategy can control the balance and stability of DC side voltage effectively by injecting zero-sequence voltage.It also studied the unbalance reason of DC side voltage for every module of each phase and phase voltage under the unbalanced grid.At last,combining the DC side voltage stabilizing and the single module DC voltage control,the paper presented a three-step decoupling control strategy,which ensures the balance and stability of voltage.It can also play a very good role in the unbalanced grid conditions.The effectiveness of the proposed control strategy was verified by the simulation results.