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针对已有串联结构有源滤波器(active DC filter,ADF)的不足,分析了HVDC系统中直流ADF基本原理后,提出了一种低成本的结合有、无源滤波方案,保证滤波器有源模块不承受直流电压,不流过直流电流,有效降低ADF装置容量的串联混合型结构;从传递函数角度建立ADF系统数学模型,将消谐控制方法用于ADF,分析其补偿原理;初步分析ADF设备与无源滤波PF设备的配合使用情况,以进一步减小有源滤波装置容量。仿真和实验结果验证该方案的有效性。
Aiming at the deficiency of the existing active DC filter (ADF) in series structure, after analyzing the basic principle of DC ADF in HVDC system, a low cost combined passive filter is proposed to ensure that the active filter ADF system mathematical model is established from the perspective of transfer function, the harmonic elimination control method is applied to ADF, and the compensation principle is analyzed. The ADF Equipment and passive filter PF equipment with the use of the situation, in order to further reduce the active filtering device capacity. Simulation and experimental results verify the effectiveness of the scheme.