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Control loop performance index measurement method based on second-order filter

A control loop and index measurement technology, applied in electrical testing/monitoring and other directions, can solve the problem of unable to meet the needs of adaptive control of power converters, and achieve the effect of fast detection and high accuracy

Pending Publication Date: 2022-07-12
HEBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in weak grids, the loop gain should be measured as soon as possible, and existing methods still cannot meet the needs of adaptive control of power converters in weak grids

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  • Control loop performance index measurement method based on second-order filter
  • Control loop performance index measurement method based on second-order filter
  • Control loop performance index measurement method based on second-order filter

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Embodiment Construction

[0023] The technical solutions of the present invention will be described in detail below with reference to the accompanying drawings.

[0024] In this embodiment, the control loop under test adopts a relatively common single-phase full-bridge inverter circuit, and the filter is an LCL type filter. like figure 1 As shown, the method for measuring the performance index of the control loop provided by the present invention (ie figure 1 In order to reflect its anti-noise performance and dynamic performance, 5% of the background harmonics are introduced into the power grid, and the grid-connected impedance Z is changed many times. G Change the performance index of the system, and now test the outermost loop i.e. i in this scenario G The cutoff frequency and phase margin of the loop (which can be thought of as a current closed-loop system).

[0025] The present invention provides a method for measuring the performance index of a control loop based on a second-order filter. The m...

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Abstract

The invention discloses a control loop performance index measurement method based on a second-order filter, which adopts a dynamic frequency searching idea, combines a second-order band-pass filter B (s), a second-order high-pass filter H (s) and a PI regulator, has the measurement time far less than that of a traditional sine frequency sweeping method, and has the advantages of high detection speed, high accuracy and high reliability. And the method can be applied to an alternating-current power grid with rich background harmonic waves. According to the performance index measurement method, the cut-off frequency and the phase angle margin of a control loop can be measured, and valuable reference information is provided for stability analysis, closed-loop parameter design and online adaptive adjustment of a control system.

Description

technical field [0001] The invention belongs to the technical field of automatic control systems, and mainly realizes continuous and rapid measurement of the cut-off frequency and phase angle margin of a control loop, in particular to a method for measuring the performance index of a control loop based on a second-order filter. Background technique [0002] In automatic control theory, control loop performance indicators (including cutoff frequency and phase margin) can characterize the dynamic and steady-state performance of the control system. In the design stage of the control system, the designer needs to adjust it by scientifically and rationally designing the parameters of the controller, so that the control system can obtain satisfactory static and dynamic performance. Therefore, the control loop performance index has a very wide range of applications, such as online dynamic performance monitoring of server / spacecraft power supplies, stability analysis of cascaded pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B23/02
CPCG05B23/0243G05B2219/24065
Inventor 王嘉晨刘青侯琪曾祥辰黄山
Owner HEBEI UNIV OF TECH