Robust Optimal Control Design for Performance Enhancement of PWM Voltage Source Inverter

PWM (pulse-width modulation) voltage source inverters are used in a wide range of AC power systems where the output voltage must be controlled to follow a sinusoidal reference waveform. In order to achieve precision and fast-tracking control, restrictive sliding mode control (RSMC) provides a fast s...

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Bibliographic Details
Published in:Micromachines (Basel) 2022-03, Vol.13 (3), p.435
Main Authors: Chang, En-Chih, Cheng, Hung-Liang, Chang, Chien-Hsuan, Wu, Rong-Ching, Cheng, Chun-An, Xiao, Zheng-Kai, Lu, Wen-Jie, Wei, Zhi-Yu
Format: Article
Language:English
Subjects:
Algorithms
Controllers
Convergence
density particle swarm optimization
Dynamic response
Electric potential
Electric power systems
enhanced restrictive sliding mode control
Equilibrium
Harmonic distortion
Inverters
Optimal control
Optimization
Parameters
Particle swarm optimization
Pulse duration modulation
PWM voltage source inverter
Robust control
Sliding mode control
Tracking control
Voltage
Waveforms
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Summary:PWM (pulse-width modulation) voltage source inverters are used in a wide range of AC power systems where the output voltage must be controlled to follow a sinusoidal reference waveform. In order to achieve precision and fast-tracking control, restrictive sliding mode control (RSMC) provides a fast system state convergence time. However, the RSMC still suffers from the chattering problem, which leads to high harmonic distortion and slow response of the inverter output state. Furthermore, the load of the inverter may be severe load changing and the control parameters become difficult to adjust, worsening the adaptability to achieve the desired control of the inverter output. In this paper, a robust optimal control design comprised of an enhanced restrictive sliding mode control (ERSMC) and density particle swarm optimization (DPSO) algorithm is proposed, and then applied to PWM voltage source inverters. The ERSMC not only has finite time convergence but also provides chatter elimination. The DPSO is highly adaptable for acquiring the control parameters of the ERSMC and finding the best solution in the global domain. The proposed controller is realized for the actual PWM voltage source inverter controlled by a TI DSP-based development platform, so that the inverter output voltage has fast dynamic response and satisfactory steady-state behavior despite high load changing and non-linear disturbances.
ISSN:2072-666X
2072-666X
DOI:10.3390/mi13030435