Chaotic particle swarm multi-objective optimization method based on three-phase three-switch two-level rectifier

Abstract

The invention relates to a chaotic particle swarm multi-objective optimization method based on a three-phase three-switch two-level rectifier, which comprises the following steps of: firstly, establishing a three-phase three-switch two-level rectifier model based on PI control under a two-synchronous rotating coordinate system; analyzing the current inner ring and the voltage outer ring respectively to obtain the influence of control parameters on the system, selecting a total harmonic distortion rate, a DC voltage error absolute value integral and a time multiplied by the error absolute valueintegral as a chaotic particle swarm optimization objective function of the three-phase three-switch two-level rectifier according to the relation between the controlled quantity and the system control parameters; initializing a particle swarm by utilizing a unidirectional coupling mapping lattice space-time chaotic model, setting model simulation parameters according to the obtained optimizationresult, and building a chaotic particle swarm multi-objective optimization (CPSO) optimization model; finally, achieving the feasibility of the method through simulation experiments and analysis experiment results. Aiming at the problems of voltage imbalance and load sudden change of a three-phase power grid in practical application, the output performance and the adaptability of the three-phasethree-switch two-level rectifier can be improved.

Description

Technical field [0001] The invention belongs to the field of three-phase three-switch two-level rectifier and particle swarm algorithm, and in particular relates to a chaotic particle swarm multi-object optimization method based on a three-phase three-switch two-level rectifier. Background technique [0002] Due to the rapid economic development in recent years, the demand for energy has increased. Low-carbon energy saving has become a common requirement of all countries in the world. The green and low-carbon development of electric energy is of great significance to energy conservation and environmental protection. Therefore, how to obtain high-quality electric energy has become the focus of current research. In order to solve the problem of harmonic pollution, PWM technology is introduced into the rectifier to produce a PWM rectifier. Its advantage is that the grid-side current is sinusoidal and theoretically can achieve unity power factor. , Low distortion rate of network curr...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the difficult problem of multi-objective parameter selection, and

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