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Fan control system fault-tolerance control method considering random time delay

A control system and fault-tolerant control technology, applied in pump control, machine/engine, mechanical equipment, etc., can solve problems such as degradation, system instability, etc., and achieve effective application prospects, reduce conservatism, and good performance characteristics.

Pending Publication Date: 2021-04-16
BEIJING HUANENG XINRUI CONTROL TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to various external random factors or communication interference in the actual control system, the time lag actually appears in a random form
Moreover, the structure of the system cannot be fixed, because failures in the fan control system are inevitable and unpredictable, which will lead to system instability and performance degradation

Method used

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  • Fan control system fault-tolerance control method considering random time delay
  • Fan control system fault-tolerance control method considering random time delay
  • Fan control system fault-tolerance control method considering random time delay

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0158] Take a typical fan torque control system as an example:

[0159]

[0160] in:

[0161] Q=[0 0 0.542]

[0162] Select actuator failure rate G=0.5, maximum controlled output torque 5N m, maximum control input u max =10, another parameter ε 1 =1,ε 2 =0.2, for ξ 0 =0.1,h 0 =0.01s, h 1 = 0.02s, h 2 = 0.04s. The following table shows that with the integral upper bound h 2 the drop of H ∞ The performance index σ also increases accordingly.

[0163] In order to further evaluate the performance of the system, the presence of external disturbances is considered:

[0164]

[0165] By applying the present invention to a typical fan torque control system, the minimum H ∞ The performance index σ is 11.7782, and the allowable controller gain matrix Calculated as:

[0166]

[0167] see figure 2 Reflects the Bernoulli probability distribution of ξ(t), image 3 Reflects the system control performance. It can be seen from the figure that when the actuator fai...

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Abstract

The invention discloses a fan control system fault-tolerance control method considering random time delay. The fan control system fault-tolerance control method considering random time delay comprises the steps that the influence of external disturbance is considered, and a state space equation of a fan torque control system is established; an improved system state equation is obtained by considering faults of an actuator in a network control system and applying input time delay and Bernoulli distribution; a constraint matrix of a controller is obtained by adopting a Lyapunov stability analysis method; and a gain matrix of a state feedback controller is obtained by calculating a matrix inequation. According to the method, a fan torque control system with actuator faults and random time delay is considered, a closed-loop control system model is established, a solution for asymptotic stability and fault-tolerance control of a closed-loop system is provided, a Lyapunov Krasovski function containing random time delay information is established, the time delay is analyzed and processed based on an extended complementary convex optimization matrix method, sufficient conditions for stabilizing the system are obtained, the conservative property of the system is remarkably reduced, and better performance characteristics are obtained.

Description

technical field [0001] The invention relates to the control field of a fan control system, in particular to a sampling data control method of a fan control system that takes into account random time delays and actuator failures, the method can make the system stable and meet performance requirements, and perform fault-tolerant control. Background technique [0002] The fan control system connects various units such as sensors, controllers, and controlled objects through a communication network. Various disturbances are inevitably encountered in a wind turbine control system, which may lead to system instability and performance degradation. Traditional control methods are realized through continuous time signals, but digital signals are often required in fan control systems. As we all know, most controllers in practical systems are designed with digital technology. Therefore, the sampling data control method that can directly design a digital controller for a continuous-tim...

Claims

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Application Information

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IPC IPC(8): F04D25/08F04D27/00
Inventor 王雅宾孙晓刚褚孝国翁存兴王传鑫
Owner BEIJING HUANENG XINRUI CONTROL TECH
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