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Self-adaptive PI (proportional-integral) control method and self-adaptive PI control system

A control method and control system technology, which is applied in the field of automatic control and automatic control of rotor excitation converters, can solve the problems that control parameters cannot be adjusted in real time, and achieve the problem of overcoming the failure of PI control parameters, strong robustness, good dynamics and The effect of steady-state characteristics

Inactive Publication Date: 2013-09-11
LG ELECTRONICS CHINA RANDD CENT SHANGHAI CO LTD
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Problems solved by technology

[0005] The purpose of the present invention is to provide an adaptive PI control method and system in order to overcome the deficiency that the control parameters in the prior art cannot be adjusted in real time

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  • Self-adaptive PI (proportional-integral) control method and self-adaptive PI control system

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specific Embodiment

[0074] The self-adaptive PI control method and system of the invention can be used for the excitation control of the wound rotor synchronous motor in the electric vehicle field. In the process of motor excitation control, the structure of PI regulator is as follows: Figure 7As shown, after the converter starts, the execution steps of the PI controller are as follows:

[0075] 1. First enter the soft start stage, complete the corresponding parameter identification, and obtain the equivalent resistance R and equivalent inductance L of the motor rotor. The specific methods and steps are shown in the above-mentioned embodiments;

[0076] 2. Using the equivalent resistance R, the equivalent inductance L, and the current setting value command given by the main controller, calculate the ratio and integral coefficient required by the PI controller. The specific methods and steps are as shown in the above-mentioned embodiments;

[0077] 3. The PI regulator enters the rapid response s...

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Abstract

The invention discloses a self-adaptive PI (proportional-integral) control method and a self-adaptive PI control system. The method includes the steps: 1), sampling and computing voltage and current of a convertor to generate corresponding voltage change rate and current change rate; 2), when the voltage change rate is lower than a voltage change rate set value and the current change rate is lower than a current change rate set rate, generating an equivalent resistance value; 3), when the voltage change rate is higher than the voltage change rate set value and the current change rate is higher than the current change rate set rate, generating an equivalent inductance value; 4), generating a proportionality coefficient and an integral coefficient of a PI controller according to a current set value, the equivalent inductance value and the equivalent resistance value; and 5), when errors of a current sampled value and the current set value of the converter are within an error set range, entering a steady-state PI control stage, and otherwise, returning to the step 2)-the step 4) to re-perform parameter identification and regenerate proportional and integral coefficients of the PI controller.

Description

technical field [0001] The present invention relates to the field of automatic control, in particular to the field of automatic control of rotor excitation converters, specifically an adaptive PI control method and system for rotor excitation converters based on online parameter identification. Background technique [0002] In the design of existing converters, there is generally no function of load parameter identification. The traditional PI control parameter design is to set various control parameters according to the system model and expert experience. [0003] PI parameter control is a classic control law, which is widely used in various control systems. PI controllers can be implemented with analog circuits or digital algorithms. Proportional control can realize quick response to deviation, and integral control can eliminate static error. Combining proportional and integral control can speed up the response to deviation while eliminating static error. The designer ...

Claims

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Application Information

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IPC IPC(8): H02P6/00
Inventor 王议锋王成山车延博张轶强
Owner LG ELECTRONICS CHINA RANDD CENT SHANGHAI CO LTD