中文摘要：

将串联型有源滤波器用于降低直流电源纹波，以满足高精度大功率稳压直流电源的低纹波供电需求．分析已有直流电源中有源滤波方案的优缺点，在此基础上将有、无源滤波措施结合，提出一种新的串联混合型直流有源滤波器．无源器件滤除主要直流纹波成分，有源模块用于提高滤波效果．电路结构保证滤波器中有源模块不承受直流电压，不流过直流电流，易于实现．基于传递函数理论建立有源滤波器S域数学模型，并分析控制系统性能．将单环反馈控制和阻抗合成技术结合，这种复合控制策略能够有效提高有源滤波器的滤波效果，并通过仿真和试验结果验证提出方案的有效性．

英文摘要：

Active filter （AF） was applied to reduce the ripple of DC power supply, and the principle was analyzed. Based on the conventional structures, a novel series hybrid DC active filter was proposed. The main DC ripple component was filtered by the passive components, and the active module was used to improve the filtering effect. The hybrid AF could ensure the active filters not bearing DC component voltage and not flowing DC component current, and could be realized easily. The mathematical model of the system was established based on transfer function, and the control system was also analyzed in detail. Incorporating simple feedback control and the resistive load synthesis technology, a hybrid control structure was proposed to improve the suppressing ripple effect of DC power supply. The proposed method was verified by simulation and experiment results.