针对单元不平衡下级联H桥多电平逆变器（CHB-MLIs）载波移相PWM（PS-PWM）调制策略移相角难以求解的问题,提出一种变移相角载波移相调制策略移相角通用计算方法。针对多单元CHB-MLIs变移相角PS-PWM调制策略中非线性超越方程组无法用解析方法求解的问题,提出一种基于BP神经网络（BPNN）与遗传算法（GA）的混合算法（BPNN-GA）进行求解。利用BPNN预处理单元直流侧电压与调制度,映射得到一组移相角模糊解,再将此模糊解作为GA的初始种群进行迭代寻优,得到载波移相角。最后,基于10单元CHB-MLIs对所提方法进行仿真验证,结果表明,单元不平衡情况下采用所提载波移相角计算方法可有效消除输出电压边带谐波。
Abstract
In order to address the challenge of determining the phase shift angles of carrier phase shift PWM （PS-PWM） modulation strategy for cascaded H-bridge multilevel inverter （CHB-MLIs） in the presence of cell imbalance, this paper proposes a general calculation method for phase shift angles of carrier phase shift modulation. The problem that the nonlinear transcendental equations in the multi-cell CHB-MLIs variable phase shift Angle PS-PWM modulation strategy cannot be solved analytically is addressed in this paper by proposing a hybrid algorithm （BPNN-GA） based on BP neural network （BPNN） and genetic algorithm （GA）. The DC-side voltage and modulation indexes of cells are preprocessed by BPNN to obtain a set of fuzzy solutions for the phase shift angles. These fuzzy solutions are then iteratively optimized using GA with the fuzzy solutions as the initial population, thus obtaining accurate carrier phase shift angles. Finally, the proposed method is verified based on the 10-cell CHB-MLIs simulation model, and the simulation results demonstrate that, in cases when the cell is unbalanced, the proposed carrier phase shift angle calculation method can successfully remove the sideband harmonics of output voltage.
关键词
级联H桥多电平逆变器 /
载波移相调制策略 /
BP神经网络 /
遗传算法 /
单元不平衡 /
谐波
Key words
cascade H-bridge multilevel inverter /
phase-shifted pulse width modulation /
BP neural network /
genetic algorithms /
cell imbalance /
harmonics
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基金
国家电网有限公司总部科技项目（5100-202255376A-2-0-ZN)
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