LCL型三电平并网逆变器无差拍控制

摘要

电压源型脉冲宽度调制(pulse width modulation,PWM)整流器交流侧通过LCL滤波器代替单电感滤波器接入电网,可以由较小的电感电容组合达到较好的滤波效果;但电容支路的引入将使传统的控制策略很难达到优良的控制效果,为此,以LCL滤波器运算电路为基础建立数学模型,并对该数学模型设计出 LCL 型三电平并网逆变器无差拍控制.MATLAB/Simulink仿真实验验证了所提的 LCL 型三电平并网逆变器无差拍控制的有效性.%It is able to achieve a better filtering effect by means of smaller inductance capacitor combination which is to use LCL filter to replace single inductor filter at the AC side of pulse width modulation(PWM)rectifier to connect into the pow-er grid,but introduction of the capacitor branch makes the traditional control strategy difficult in achieving excellent control effect.Therefore,this paper establishes a mathematical model based on operational circuit of LCL filter and designs dead-beat control for this LCL three-level grid-connected inverter.Simulating experiment based on MATLAB/SIMULINK veri-fies effectiveness of the dead-beat control.