针对电网谐波具有严重的危害性，提出了一种用以抑制电网谐波的多功能单相单位功率因数变换器．采用四管全桥式开关的主电路拓扑结构和较为简单的双环（直流电压环和总电流环）控制策略，使得此装置不但可以用作单位功率因数整流器，以替代许多传统电力电子装置的输入阶段的整流部分，而且还可以同时用作有源功率滤波器，实现对用户已有的非线性功率装置在工作时所产生的谐波和无功电流的补偿．为从理论上研究此装置的工作原理，给出了电流环的数学模型，并分析了电流环的动态特性．讨论了电流失真的产生原因及其相应的抑制方法．给出的小功率实验装置的实验结果表明，该装置工作时的输入功率因数接近１，从而验证了所提出方案的可行性 Aiming at the serious harmfulness of power network harmonics, a multi-functional single-phase unit power factor converter is proposed to restrain the harmonics of power system. The main circuit topology of the four-tube full-bridge switch and the simple double loop (DC voltage loop and total current loop) control strategy make this device not only be used as a unit power factor rectifier but also as an alternative to many conventional power electronic devices Phase rectifier part, but also can be used at the same time as the active power filter to achieve the user’s existing non-linear power devices in the work of the harmonic and reactive current compensation. In order to theoretically study the working principle of the device, the mathematical model of the current loop is given and the dynamic characteristics of the current loop are analyzed. The causes of the current distortion and corresponding suppression methods are discussed. The experimental results of the low-power experimental device show that the input power factor of the device is close to 1, which verifies the feasibility of the proposed scheme