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Method for designing parameters of parameter self-tuning fuzzy PI (proportion integration) in PWM (pulse width modulation) rectifiers

A technology of parameter design and rectifier, applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., can solve the problem that it is difficult to show the superiority of the fuzzy PI controller, and achieve the effect of avoiding blindness

Inactive Publication Date: 2015-07-22
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

In actual operation, the reference value and variation range of the parameter self-tuning PI controller are mostly set according to engineering experience, and the parameter design has a certain degree of blindness, which makes it difficult to show the superiority of the fuzzy PI controller

Method used

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  • Method for designing parameters of parameter self-tuning fuzzy PI (proportion integration) in PWM (pulse width modulation) rectifiers
  • Method for designing parameters of parameter self-tuning fuzzy PI (proportion integration) in PWM (pulse width modulation) rectifiers
  • Method for designing parameters of parameter self-tuning fuzzy PI (proportion integration) in PWM (pulse width modulation) rectifiers

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Embodiment Construction

[0023] The present invention proposes a fuzzy controller parameter design method for the previously studied parameter self-tuning fuzzy PI controller of the voltage outer loop, so as to achieve the purpose of optimizing the dynamic performance of the DC side output of the PWM rectifier. Starting from the control structure of the PWM rectifier, the specific steps of this method are as follows:

[0024] a, three-phase PWM rectifier topology such as figure 1 Shown by its figure 2 Shows the dq decoupling control block diagram, get image 3 The shown voltage outer loop simplifies the control block diagram. The voltage regulator is designed according to the classic type II system, and the corrected open-loop transfer function is:

[0025] W ou ( s ) = 0.75 K u ( T u s + 1 ) CT u ( T eu s + 1 ) - - - ( 1 )

[0026] Where K u ,T u Is the voltage outer loop PI regulator parameter; C is the capacitance...

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Abstract

The invention discloses a method for designing parameters of fuzzy PI (proportion integration) controllers of PWM (pulse width modulation) rectifiers. The method includes acquiring voltage external loop PI parameters by means of computation according to conventional processes for designing the PI controllers when the parameters of the voltage outer loop fuzzy controllers of the PWM rectifiers are designed; selecting a plurality of groups of PI parameters of the same order of magnitude according to arithmetic sequences on the basis of the voltage outer loop PI parameters, substituting the selected multiple groups of parameters into systems to carry out simulation and recording dynamic performance simulation results of the systems under the conditions of the various groups of PI parameters; determining the maximum values K<P_max> of variation of parameters K of PI adjusters and the maximum values K<i_max> of variation of parameters K of the PI adjusters by the aid of curve characters of the simulation results. The method has the advantages that actual parameters K and K are adjusted in real-time according to fuzzy control principles and deviation e and deviation variation rates ec of the systems, the PI parameters are acquired by the aid of the dynamic performance simulation curve characters of the systems, accordingly, blind selection of the parameters can be prevented, and the systems are short in adjusting time and low in overshoot on the premise that the systems work stably.

Description

Technical field [0001] The invention belongs to the technical field of power electronics, and relates to a PI parameter design method of a fuzzy controller in a PWM rectifier. Background technique [0002] With the rapid development of green energy technology, PWM rectifier technology has become a hot spot in power electronics technology research. The PWM rectifier can achieve adjustable voltage, unit power factor, and even two-way energy flow. Compared with traditional uncontrollable rectifiers, the reactive power and harmonic "pollution" of the power grid is greatly reduced, so it has been widely used. Conventional voltage-type PWM rectifiers based on the dq coordinate system generally adopt double closed-loop control methods, namely, voltage outer loop and current inner loop. The design of the control system is extremely important to the performance of the rectifier, and the design of PI parameters in the design of the control system is closely related to the dynamic performa...

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Application Information

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IPC IPC(8): H02M7/219
Inventor 何晓琼李乾勇陈亚军柳明舒泽亮
Owner SOUTHWEST JIAOTONG UNIV
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