【摘要】 为了解决非线性负载容量日益增加的问题,提出了一种能根据自身容量补偿谐波电流的有源滤波器。当检测谐波电流超出滤波器自身容量时,该滤波器可根据自身容量用优化方式输出补偿电流。这种设计使整个有源电力滤波器系统即使在过载情况下也工作得很好,解决了有源滤波器容量灵活扩充的问题。理论分析和仿真结果均证明了其有效性。更多还原

【Abstract】 To solve the problem that active power filters(APFs) should meet the needs of increasing nonlinear loads,this paper proposes an APF having the capacity-limitation function of compensating load harmonics.In this APF,if the detected harmonic current exceeds the limit current of the APF,the compensating current can be limited with an optimal approach under capacity-limitation.Consequently,the APF proposed in this paper is optimized to maximize the APF efficiency and to minimize the total harmonic distortion of the line current supplied by the source.When such capacity-limited APFs are cascade-connected between source and load,all harmonic components will be automatically distributed to the APFs participating in the compensation without needing control interconnection.Through the proposed design,the capacity-limitation makes the system work well even under overload conditions.The APF has expansion flexibility when larger APFs arc required for a larger system.In addition to describe the theoretic bases of the proposed APF,this paper also researches the control algorithm of the APF.Theoretical analysis and simulation results are provided for demonstrating the effectiveness of the proposed approach.更多还原