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Parameter adjusting method of variable parameter PI (proportion-integral) adjuster

A parameter adjustment and regulator technology, applied in the field of power electronics, can solve the problem of not taking into account the dynamic performance and steady-state performance.

Inactive Publication Date: 2013-11-13
CHINA XD ELECTRIC CO LTD
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Problems solved by technology

[0004] The purpose of the present invention is to provide a parameter adjustment method of a variable parameter PI regulator, by adjusting the parameters of the PI regulator, to solve the above-mentioned process of controlling the PWM rectifier through parameters, the problem that the dynamic performance and the steady-state performance cannot be taken into account

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  • Parameter adjusting method of variable parameter PI (proportion-integral) adjuster
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  • Parameter adjusting method of variable parameter PI (proportion-integral) adjuster

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Embodiment Construction

[0037] In order to clearly illustrate the solution of the present invention, the following describes in detail in conjunction with the embodiments and accompanying drawings.

[0038] see figure 1 , the steps of the embodiment include:

[0039] S11: Determine the error between the current DC bus voltage and the target voltage;

[0040] S12: Determine the deviation state of the error and the variation trend of the error, and adjust the proportional adjustment coefficient Kp accordingly;

[0041] S13: Adjust the final PI parameter according to the Kp and the output parameter Ki of the integral term.

[0042] Through the above steps, the proportional adjustment coefficient Kp is adjusted correspondingly according to the deviation state and change trend of the error, and finally the PI parameter is adjusted. Since Kp is adjusted according to the error situation, dynamic performance and steady-state performance are taken into account during the process of controlling the PWM rect...

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Abstract

The invention discloses a parameter adjusting method of a variable parameter PI adjuster. The parameter adjusting method comprises the following steps of determining an error between the current voltage of a DC (direct current) bus and a target voltage; determining the deviation state and the variation trend of the error and correspondingly adjusting a proportion adjusting coefficient Kp; according to the Kp and integral terms, outputting a parameter Ki and adjusting the final PI parameter. Therefore, the proportion adjusting coefficient Kp is adjusted correspondingly according to the deviation state and the variation trend of the error and the PI parameter is adjusted in the end; due to the fact that the Kp is adjusted according to the error, during the process of controlling a PWM (pulse-width modulation) rectifier through the parameter, dynamic properties and steady-state properties can be both guaranteed.

Description

technical field [0001] The invention belongs to the field of power electronics and relates to a parameter adjustment method of a variable parameter PI regulator. Background technique [0002] At present, the PWM rectifier control method adopts the current and voltage double-loop control strategy, and the voltage loop mostly adopts single-coefficient control. From the point of view of the overall control effect of the system, since the regulator parameters cannot be changed, it is difficult for this single-coefficient control method to balance dynamic performance and steady-state performance. [0003] The control system using a single-coefficient proportional-integral controller first considers the steady-state performance of the system, so the parameter selection is relatively small. When the system load suddenly increases, the DC bus voltage will have a voltage drop process. If the parameter selection is small, the voltage drop will be larger. Similarly, when the system ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/12
Inventor 刘辉臣苏位峰张东升卫三民苟锐锋李侠周京华
Owner CHINA XD ELECTRIC CO LTD
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