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A Design Method of Fuzzy Pi Controller Parameters in PWM Rectifier

A parameter design and controller technology, applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc. Effect

Inactive Publication Date: 2017-03-01
SOUTHWEST JIAOTONG UNIV
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  • Summary
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  • Description
  • Claims
  • Application Information

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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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  • A Design Method of Fuzzy Pi Controller Parameters in PWM Rectifier
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  • A Design Method of Fuzzy Pi Controller Parameters in PWM Rectifier

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Embodiment Construction

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

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

[0025]

[0026] where K u , T u is the parameter of the voltage outer loop PI regulator; C is the capacitance value, T eu is the sum of the small inertia time constant of voltage sampling and the equivalent time of the current ...

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Abstract

The invention discloses a parameter design method of a PWM rectifier fuzzy PI controller. When designing the parameters of the fuzzy controller for the voltage outer loop of the PWM rectifier, the PI parameters of the voltage outer loop are first calculated according to the conventional PI controller design method. Based on this, multiple sets of PI parameters of the same order of magnitude are selected according to the arithmetic sequence, and the selected multiple sets of parameters are substituted into the system for simulation, and the simulation results of system dynamic performance under each set of PI parameters are recorded. The maximum KP parameter change KP_max and the KI parameter change maximum value Ki_max of the PI regulator are determined from the curve characteristics of the simulation results. The actual Kp and Ki parameters are adjusted in real time according to the system deviation e and deviation change rate ec according to the principle of fuzzy control, and the PI parameters are obtained from the characteristics of the system dynamic performance simulation curve, which avoids blind selection of parameters and makes the system adjust The time is short and the overshoot is small.

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 the research of power electronics technology. PWM rectifiers can realize voltage adjustment, unit power factor, and even bidirectional energy flow. Compared with traditional uncontrollable rectifiers, the reactive power and harmonic "pollution" to the power grid are greatly reduced, so they have been widely used. Conventional voltage-type PWM rectifiers based on the dq coordinate system generally adopt a double-closed-loop control method, that is, an outer voltage loop and an inner current 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 relat...

Claims

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Application Information

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