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PI control system and method based on empirical error

A control system and experience technology, applied in the field of electronic information, can solve the problem of unstable output of power quality control equipment, and achieve the effects of improving control smoothness and output stability, ensuring effectiveness, and reducing output fluctuations.

Active Publication Date: 2021-04-23
河南知汇电力技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention provides a PI control system and method based on empirical errors to solve the technical problem of unstable output of existing power quality control equipment

Method used

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  • PI control system and method based on empirical error
  • PI control system and method based on empirical error
  • PI control system and method based on empirical error

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: a kind of PI control system based on experience error, see figure 1 , the actual output signal of the system is y o , the standard signal to be output is y * , from y o Introduce a feedback branch and y * They are sent to the comparator together, and the error signal e(t) is output, and then the error signal e(t) is divided into two branches, one is connected to the proportional device Kp, and the other is input to the experience generator to obtain the empirical error em(t) and then connected Integrator Ki, and finally sum the outputs of the proportional device Kp and the integrator Ki to obtain the control signal u(t). The control signal u(t) acts on the controlled object to the output signal y o Make adjustments to reduce output fluctuations and improve stability. In the existing PI control system, see figure 2 , the control variable u(t) is the error function e(t) multiplied by the proportional coefficient Kp plus the integral of the error funct...

Embodiment 2

[0029] Embodiment 2: a kind of PI control method based on experience error, see image 3 , including the following steps,

[0030] S1: Set the required reference current y*;

[0031] S2: the actual output current y of the acquisition system o ;

[0032] S3: the actual output current y o Compared with the reference current y*, the difference e(t) is obtained;

[0033] S4: Calculate the mean value of e(t) within a period T;

[0034] S5: Process e(t) and em(t) according to the following relationship to obtain the control variable u(t): ;

[0035] S6: Digitally process u(t) into a closing control signal for controlling the switch of the converter, and control the closing of the switch of the converter, thereby realizing the control of the output current.

[0036] exist figure 2 In the existing PI control system shown, the control quantity is determined by the instantaneous error e(t). Under continuous time control, the specific formula of the control quantity is as follo...

experiment example 1

[0040] Experimental Example 1: Apply the scheme described in Example 2 to SVG products, and the input and output test results are as follows Figure 4 As shown, compared with the traditional PI, the output control quantity u(t) of the present invention changes within the range of 0.1V, and the fluctuation of u(t) (that is, the glitch on the u(t) curve) is greatly reduced, which means It means that the influence of instantaneous error fluctuation on output stability can be effectively suppressed by the control method of the present invention.

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Abstract

The invention discloses a PI control system and method based on an empirical error, and aims to solve the technical problem of unstable output of existing power quality control equipment. A control error is formed according to a target value and an actual output value, the proportion of the error and the integral of an empirical error are linearly combined to form a control quantity to control a controlled object, and the empirical error is generated by an empirical generator. The invention aims to solve the problem of output fluctuation caused by instantaneous error fluctuation and improve the control smoothness and the output stability, thereby ensuring the effectiveness of power quality control equipment.

Description

technical field [0001] The invention relates to the technical field of electronic information, in particular to a PI control system and method based on empirical errors. Background technique [0002] With the development of power electronics technology, a large number of non-linear and impact loads are connected to the power grid, causing increasingly severe power quality problems; at the same time, the construction of smart grids and new energy development put forward new requirements for power quality, which makes power quality governance imminent. Power quality control has become one of the major issues facing the fields of power electronics, electrical automation and power systems, and power quality control equipment as an effective power control tool has also received more and more attention. [0003] Traditional power quality control equipment is widely used in engineering practice, especially in power quality control equipment due to its advantages of simple method, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04H02J3/18H02J3/26
CPCG05B13/042H02J3/1842H02J3/26Y02E40/30Y02E40/50
Inventor 尹小正张云阳赫海燕
Owner 河南知汇电力技术有限公司
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