基于电压型控制DC-DC变换器双脉宽调制对电流谐波抑制的研究

The Study of Current Harmonic Suppression Based on the Voltage Type Double Pulse Width Modulation Control of DC-DC Converter

物理滤波是传统变换器开关产生动作的基础,本研究基于谐波对滤波的严重依赖,探寻减少此依赖的方法,并抑制电流谐波而展开研究,通过调制双脉宽减少源头谐波的产生来实现。BUCK电路这种直流斩波器,开关是基于双脉冲来进行控制的,当电流是连续时,就会对输出波执行傅里叶展开操作,双脉冲相位差直接影响到各次谐波的幅值。对比例系数H(n, D),G(n, D)与谐波周期占空比Don以及谐波次数n建立数学模型,构建它们之间的函数关系,基于Matlab仿真对谐波抑制的效果进行分析比较。除此之外,设计并选择最简控制电压型的手段以及其实现方法。

Filtering of physics is the basis of the traditional converter switch action. This study is based on the heavy rely of the harmonic wave on filtering, exploring methods to reduce the dependence, and researches on the suppression of harmonic current, by double pulse width modulation to reduce the generation of harmonic source. The BUCK circuit dc chopper is based on double pulse to control switch, when the current is continuous, it can be operated on output wave fourier, double pulse phase difference directly affects every harmonic amplitude. A mathematical model of proportion coefficient of H （n, D）, G （n, D） and harmonic cycle Don duty ratio is established in this paper, and the harmonic number n, function relation between them is built up, the effect of harmonic generation based on Matlab simulation is analyzed. In addition, the similarities and differences between pulse width modulation and traditional methods are compared and analyzed for the optimal control voltage type of the means and its implementation methods.