METHOD FOR CALCULATING PHASE SHIFT ANGLES OF CHB-MLIS PHASE-SHIFTED PULSEWIDTH MODULATION UNDER ELL UNBALANCE

Lai Jidong; Nie Zhaowei; Dong Wei; Su Jianhui; Chen Qing; Lyu Zhenhua

doi:10.19912/j.0254-0096.tynxb.2024-0140

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (5) : 338-344. DOI: 10.19912/j.0254-0096.tynxb.2024-0140

METHOD FOR CALCULATING PHASE SHIFT ANGLES OF CHB-MLIS PHASE-SHIFTED PULSEWIDTH MODULATION UNDER ELL UNBALANCE

Lai Jidong¹, Nie Zhaowei¹, Dong Wei¹, Su Jianhui¹, Chen Qing¹, Lyu Zhenhua²

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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.

Key words

cascade H-bridge multilevel inverter / phase-shifted pulse width modulation / BP neural network / genetic algorithms / cell imbalance / harmonics

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Lai Jidong, Nie Zhaowei, Dong Wei, Su Jianhui, Chen Qing, Lyu Zhenhua. METHOD FOR CALCULATING PHASE SHIFT ANGLES OF CHB-MLIS PHASE-SHIFTED PULSEWIDTH MODULATION UNDER ELL UNBALANCE[J]. Acta Energiae Solaris Sinica. 2025, 46(5): 338-344 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0140

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