期刊
IEEE TRANSACTIONS ON POWER ELECTRONICS
卷 36, 期 1, 页码 274-284出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2020.3002968
关键词
Switches; Capacitors; Voltage control; Modulation; Harmonic analysis; Switching frequency; Topology; Model predictive control (MPC); multilevel inverter; selective harmonic elimination (SHE); voltage balancing
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- National Natural Science Foundation of China [61973307, 61936008]
This article presents a composite strategy that combines SHE-PWM and MPC for 7L-HC inverters. By integrating the unified SHE formulation and using MPC to control capacitor voltages, the strategy successfully reduces switching frequency, improves harmonic performance, and ensures voltage balance.
A composite strategy that combines selective harmonic elimination pulsewidth modulation (SHE-PWM) and model predictive control (MPC) for seven-level hybrid-clamped (7L-HC) inverters is presented in this article. By introducing the unified SHE formulation, all seven-level switching patterns and corresponding switching angles can be obtained simultaneously. Therefore, the optimal switching pattern with the designed optimization goal of each modulation index can be evaluated, and the best expected output performance is achieved. For the voltage balancing issue of 7L-HC, MPC is adopted to control the dc-link and flying capacitors. After receiving the output voltage level signal from the SHE-PWM modulator, the optimal switching state that belongs to the received output voltage level that minimizes the cost function is selected by the MPC module, where the cost function is designed to simultaneously balance capacitor voltages and reduce the switching frequency. Dynamic weighting factors with variable band limits are also proposed to further improve the system performance. The potential industrial application of high-power motor drive is used as an example in designing the key parameters for both SHE and MPC parts. Simulation and experimental results confirmed the validity of this composite SHE-MPC strategy in reducing the switching frequency and improving harmonic performances while keeping capacitor voltages well balanced.
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