针对传统的多模块并联有源电力滤波器需要对谐波和无功电流进行检测，算法复杂的问题，提出将直接电流控制策略推广应用到多模块并联APF( active power filter)中，给出了直接电流控制的多模块并联APF的稳定性分析方法。首先构建了直流侧电压、网侧电流双闭环控制方案；然后建立了系统的小信号模型，分析了系统的稳定性，并给出控制参数的设计准则；最后通过一台1 kVA、10 kHz两模块并联APF的原理样机实验验证了理论分析的正确性。%The traditional multi-modular shunt active power filter ( APF ) needs to handle harmonic and reactive current, the algorithm is complex, and the harmonic compensation performance is deteriorated. In order to solve this problem, a multi-modular shunt APF based on direct current control ( DCC) was proposed. At the same time, the stability analysis for the APF with DCC was presented. Double closed loop control scheme for the DC voltage and in-gird current was constructed, and then the small-signal model and stability conditions were studied. The design guidelines for the multi-modular shunt APF sys-tem were also deduced. A 1kVA prototype based on two APF modules in parallel connection operating at 10 kHz was developed to verify the theoretical analysis.
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