Analysis of Harmonic Characteristics in Non-Ideal Conditions of Modular Series/Parallel Inverter Based on Carrier Phase Shift Control
Chen Yihan1, Guo Honghao1, Chen Jiawei2
1. College of Automation & AI Nanjing University of Posts & Telecommunications Nanjing 210023 China; 2. College of Automation Engineering Chongqing University Chongqing 400044 China
Abstract：With the larger scale application of multi-electric and all-electric aircraft, higher requirements are put forward on the power capacity of aeronautical static inverter (ASI), and more power expansion is realized by modular series and parallel methods. The expansion mode combined with carrier phase shift modulation can further reduce the switching frequency harmonic components of the system. However, the parameter imbalance between the modular modules on the airborne occasion and the control mode based on the analog circuit cause additional low frequency or DC offset disturbances in control signals, resulting in superimposing unconventional harmonic components on the input and output sides of the ASI. In this paper, based on the double-Fourier analysis and exponential function model of bridge voltage, the input and output harmonic distributions of modular series and parallel ASI are performed under non-ideal conditions. Analysis and comparison reveal the harmonic distribution characteristics of the modular ASI. Finally, the correctness of theoretical analysis is verified by simulation and experiment.
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2020, Vol. 35 
