Abstract
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.
Highlights
With the increasing demand for high quality power supplies, PWM voltage source inverters have become an important unit of high-performance power conversion systems such as solar energy systems, wind energy systems and fuel cell systems [1–4]
The performance of the inverter is usually evaluated according to the following criteria: (1) The presence of a low total harmonic distortion (THD) output voltage waveform under linear or non-linear loading conditions
Based on the fast convergence properties of the terminal attractor, the restrictive sliding mode control (RSMC) can bring the system tracking error to zero in a restricted time and establish more accurate control, which is suitable for the control of PWM voltage source inverters [12–14]
Summary
With the increasing demand for high quality power supplies, PWM voltage source inverters have become an important unit of high-performance power conversion systems such as solar energy systems, wind energy systems and fuel cell systems [1–4]. Based on the fast convergence properties of the terminal attractor, the RSMC can bring the system tracking error to zero in a restricted time and establish more accurate control, which is suitable for the control of PWM voltage source inverters [12–14]. The DPSO selectively guides the update of particles based on the magnitude of the density, speeding up the convergence of the algorithm It has easy calculation and enhanced population diversity that demonstrates global seeking ability and has been widely used to solve many optimization problems [21–24]. Whether the load is linear or highly non-linear, the proposed controller will enable fast dynamics and steady-state performance in the output voltage of PWM voltage source inverters. The PWM voltage source inverter is compared with a PWM voltage source inverter controlled by a conventional RSMC, showing the superior performance of the proposed inverter
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