Multi-objective fractional order PID control method for DC buck converter

Abstract

The invention discloses a multi-objective fractional-order PID control method for a DC buck converter. The method comprises the following steps: firstly, multiplying the error time between an actual output voltage and a reference voltage of the DC buck converter by an absolute error integral, an actual output voltage overshoot, and an settling time as three optimization objective functions; then,designing an efficient multi-objective differential evolution solver to obtain an optimal control parameter of the fractional-order PID control method offline; and finally, inputting the optimal control parameter into an actual digital processing signal processor to realize a real-time control of an output voltage of an actual DC buck converter. Compared with the prior art, the multi-objective fractional-order PID control method for the DC buck converter can automatically obtain the optimal control parameter of the DC buck converter by means of computer-aided design technology; and the actualoutput voltage of the DC buck converter has smaller overshoot and moire, faster stabilization speed, and better robust performance.

Description

technical field [0001] The invention relates to an intelligent control technology in the field of power electronic conversion, in particular to a multi-objective fractional-order PID control method for a DC step-down converter. Background technique [0002] As an important link in modern power electronic systems, switching power converters have a direct impact on the performance of the entire electronic and electronic system. Therefore, the modeling and control of switching power converters has always been a research hotspot in academic circles and engineering applications at home and abroad. one. Studies in recent years have shown that: as a typical piecewise smooth nonlinear time-varying system, switching power converters have nonlinear dynamic phenomena such as frequency reduction, low-frequency fluctuations, sub-harmonic oscillations, bifurcations, intermittences, and chaos. Complex nonlinear characteristics seriously affect the performance of the system. [0003] With...

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Problems solved by technology

However, the research on the application of fractional-order control methods in switching power conversion systems is still very limited, mainly focusing on the research on fractional-order PID control for Boost and Buck converters. The fractional-order PID control parameters used mainly rely on the experience of engineers or a single Single-objective optimization methods such as objective genetic algorithm are difficult to realize the compromise optimization of multiple performance indicators of the output voltage dynamic response and steady-state response of the DC converter at the same time

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