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Method for judging margin of multi-loop control system

A technology of control system and single-loop control, applied in general control system, control/regulation system, adaptive control, etc., can solve problems such as limitations, poor control quality and robustness, and achieve easy application, physical well-defined effects

Active Publication Date: 2019-06-28
北京航天飞腾装备技术有限责任公司
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Problems solved by technology

However, for the design and analysis of multi-loop control systems, control theory and engineering examples all show that there are situations where the phase and amplitude margins and cut-off frequencies meet the design indicators, and the control quality and robustness are not good. The method of judging the control quality and robustness of the multi-loop control system by the amplitude margin is limited

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Embodiment Construction

[0025] The invention provides a method for judging the margin of a multi-loop control system. The margin of the control system is defined as a delay margin, which can be quantitatively calculated to obtain the delay margin of the multi-loop control system, and then determine the control quality and robustness of the control system , which can be used in the design and analysis of multi-loop control systems, including the following steps:

[0026] Step 1, right figure 1 The multi-loop control system shown performs equivalent transformation, that is, the feedback output node 3 of the inner loop is moved to the output node 4 of the system, and the feedback input node 2 of the inner loop is moved to the input node 1 of the system, that is, transformed into a non-unit For a feedback single-loop control system, the transfer function of the forward channel loop is

[0027] G(s)=G c1 (s)S(s)P 1 (s)P 2 (s)

[0028] The feedback loop transfer function can be expressed as

[0029] ...

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Abstract

A method for judging margin of a multi-loop control system comprises the following steps: step 1, equivalently transforming the multi-loop control system into a non-unit feedback type single-loop control system; step 2, calculating a transformed open-loop transfer function open (s); step 3, calculating cut-off frequency as phase margin according to the open-loop transfer function open (s); step 4,calculating delay margin Dm, and judging control margin of the multi-loop control system according to the delay margin Dm. The method obtains delay margin of the control system through calculation, as compared with phase margin and amplitude margin, the delay margin can better explain control quality and robustness of the multi-loop control system, and the method has universality for the multi-loop control system.

Description

technical field [0001] The invention relates to a method for judging the margin of a multi-loop control system. Background technique [0002] Based on the classic control system design, it is necessary to test the frequency index of the open-loop control loop, that is, to calculate the phase and amplitude margin and cut-off frequency of the open-loop control loop, and then evaluate the control quality of the control loop. However, for the design and analysis of multi-loop control systems, control theory and engineering examples all show that there are situations where the phase and amplitude margins and cut-off frequencies meet the design indicators, and the control quality and robustness are not good. The method of amplitude margin to judge the control quality and robustness of multi-loop control system is limited. Contents of the invention [0003] The technical problem of the present invention is: to overcome the deficiencies of the prior art, the present invention pro...

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Application Information

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IPC IPC(8): G05B13/02
Inventor 王明光钟高伟魏丽霞王晓燕李广张超宗焕强
Owner 北京航天飞腾装备技术有限责任公司
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