Fractional order PID control method for electrostatic dust collection power source

Abstract

The invention discloses a fractional order PID control method for an electrostatic dust collection power source. The phase angle and gain of an open-loop system are obtained in combination with a transfer function of the high-frequency electrostatic dust collection power source and a transfer function of the fractional order PID control method; a margin relation is used for obtaining a KP, a KI and a KD of a fractional order PID control system; furthermore, multiple sets of KPs, KI s and KDs are obtained according to different differential integral orders; according to a time domain expression, the output quantity of a fractional order PID controller is obtained through calculation; according to an ITAE measurement criterion, system output error values of different sets of data are obtained; one set of data is adopted as setting parameters when an ITAE value is minimum; in combination with the linear relation between the output quantity of the PID controller and IGBT driving frequency, driving frequency for reasonably controlling an IGBT is obtained. Fractional order PPID parameters can be accurately set, so that ideal control over the high-frequency electrostatic dust collection system is achieved; a floating-point type DSP is adopted for efficiently processing fractional order calculus calculation; the fractional order PID control method has the advantages of being short in rise time, small in steady-state error, high in robustness, wide in application range and the like.

Description

technical field [0001] The invention relates to the development of a control system for a high-frequency, high-voltage, and high-power power supply for electrostatic dust removal, and belongs to the technical field of high-power, high-voltage power supplies. Background technique [0002] In recent years, my country's industrial level and scale have continued to develop and expand, and the amount of exhaust gas emissions has gradually increased. These smoke and dust carry a large amount of harmful substances into the atmosphere, seriously affecting the ecological environment and human health. In order to strengthen the control of environmental pollution, many countries have included dust emission in national standards for control, and the emission standards have gradually become stricter. [0003] The electrostatic dust removal scheme widely used at home and abroad is mainly based on the power supply of industrial frequency. This type of power supply has simple structure, la...

AI Technical Summary

Problems solved by technology

However, there are the following disadvantages: low power supply efficiency, small power factor; large output voltage fluctuations lead to relatively low dust removal efficiency

However, since the research object or controlled object is generally not an ideal integer-order system, but is composed of differential equations and integral equations of any order, the limitations of integer-order PID cannot meet the performance requirements of the controlled object.

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