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A method for measuring control loop performance index

A control loop and index measurement technology, applied in the control field, can solve problems such as large errors in bandwidth measurement values, and achieve the effect of fast detection speed

Active Publication Date: 2022-06-28
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the test is performed with the help of a dynamic signal analyzer, since the frequency sweep data output rate is restricted by the serial port baud rate, there will be a large error in the bandwidth measurement value at high frequencies

Method used

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  • A method for measuring control loop performance index
  • A method for measuring control loop performance index
  • A method for measuring control loop performance index

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Embodiment Construction

[0022] The technical solutions of the present invention will be described in detail below with reference to the accompanying drawings.

[0023] In this embodiment, the control loop under test adopts a relatively common single-phase full-bridge inverter circuit, the filter is an LCL filter, and the control loop is i L -V o -i g The three-loop control mode (the left side is the inner ring, the right side is the outer ring), and the specific control form is DB-DB-PI. like figure 1 As shown, now test the outermost ring i.e. i g The bandwidth of the loop (which can be regarded as a current closed-loop system);

[0024] The method for measuring the performance index of the control loop provided by the present invention is used for measuring figure 1 i in the circuit g The bandwidth of the loop control loop, including the following steps:

[0025] (1) inject small signal

[0026] Towards the control loop under test (i g A variable frequency sine wave small signal x is inject...

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Abstract

The invention discloses a method for measuring the performance index of the control loop. The method for measuring the performance index of the control loop adopts the idea of ​​dynamic frequency seeking, does not need to scan frequency like the traditional frequency response method, and has fast detection speed. The performance index measurement method can measure the cut-off frequency and phase angle margin of the control loop, which provides valuable reference information for the closed-loop optimization design of the control system.

Description

technical field [0001] The invention belongs to the technical field of control, in particular to a method for measuring a control loop performance index. Background technique [0002] Based on the theory of automatic control, the controlled object in the field of electrical engineering is often simplified as a linear steady system. This type of system is convenient for mathematical modeling and analysis, and its control system is generally composed of single or multiple control loops cascaded. Each control loop is independent of each other and controlled by its own loop regulator (linear or non-linear). Therefore, the design of the loop regulator is the core of the entire control system design, and needs to follow the given performance indicators (ie: loop bandwidth and phase angle margin) to meet the expected dynamic and static performance requirements of the system. However, due to the influence of system model error, parameter disturbance and other factors, there is alw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B23/02
CPCG05B23/0256G05B2219/24065
Inventor 刘青王嘉晨韩伟健辛振陈建良明磊
Owner HEBEI UNIV OF TECH