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中文摘要：
针对级联型H桥有源电力滤波器（APF）直流电压的不平衡，提出了改进的电压内、外环加电流环控制方法，实现直流电压的均衡控制。采用基于瞬时无功功率理论的ip-iq谐波检测法和CPS—SPWM调制技术，搭建了2级级联型APF模型。仿真结果表明，采取所提出控制策略的级联型H桥APF能够很好地补偿谐波电流，同时也能维持直流电压的平衡和稳定，从而验证了方法的正确性和可行性。
英文摘要：
An improved tri-loop control method of outer vohage loop, inner voltage loop and current loop was put forward for the imbalance of the capacitors voltage at shunt H-bridge cascaded multilevel APF DC side. A detecting circuit of ip-iq harmonic and reactive current based on instantaneous reactive power theory, and carrier phase-shifted SPWM technique, were used to build two cascade units APF model. The simulation results show that using the proposed control strategy, the output compensation current is traced, meanwhile the DC capacitor voltage of H-bridge is stable, and the DC voltages among H-bridges are balanced. So, the controlling method is proper and feasible.
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