半桥变流器均压与锁相控制的交互影响  

Interactions Between the Voltage Balance and the Phase-locked Loop Control for Half-bridge Converters

作　　者：张斯翔 王琦 杨飞[2] 徐坤山 ZHANG Si-xiang;WANG Qi;YANG Fei;XU Kun-shan(China Three Gorges Corporation,Chengdu 610041,China;不详)

机构地区：[1]中国长江三峡集团有限公司,四川成都610041 [2]国电南瑞科技股份有限公司,江苏南京211106 [3]南京工程学院,江苏南京211106

出　　处：《电力电子技术》2020年第9期36-38,共3页Power Electronics

基　　金：中国长江三峡集团有限公司科研项目(JD-FD-06003)。

摘　　要：半桥类变流器输出电压谐波含量小、功率器件电压应力较低,其输出电流中直流分量对半桥电容电压压差的均衡具有重要作用。但在变流器非线性环节锁相环(PLL)的作用下,变流器输出电流的偶次谐波成分会被放大。为提高半桥类变流器输出电流质量,在此提出基于移动平均值滤波和偶次谐波陷波器的控制方法,对进入PLL的公共耦合点电压信号进行滤波处理,削弱了半桥电容电压均压控制同锁相控制间的低频谐波交互影响。实验验证了所提滤波控制方法对抑制输出电流偶次谐波的有效性。The half-bridge converter is characterized by the low output harmonics and the low voltage stress of the power devices.The DC component of the output current is of high impact on the voltage balance of the DC-side capacitors,which may amplify the even harmonic current under the effect of the non-linear phase-locked loop(PLL).For the sake of improving the output current quality,the moving-average filter and the even-harmonic notch filter are proposed to filter out the voltage at the point of common coupling,which is sent to the input of the PLL.The low-frequency interactions between the PLL and the voltage balance of the capacitors are mitigated.Experiments verify the effectiveness of the proposed filter-based control method in suppressing the even harmonic of the output current.

关 键 词：半桥变流器 均压控制 锁相环 偶次谐波 

分 类 号：TM46[电气工程—电器]