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Single-loop control system performance evaluation method based on ARMA model

A single-loop control and system performance technology, applied in the field of control, can solve the problems of unsuitable industrial on-line performance evaluation and unsatisfactory evaluation methods

Active Publication Date: 2018-12-18
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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Problems solved by technology

[0005] In short, the existing evaluation methods are not ideal and are not suitable for on-line performance evaluation at industrial sites, and further research is necessary

Method used

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  • Single-loop control system performance evaluation method based on ARMA model
  • Single-loop control system performance evaluation method based on ARMA model
  • Single-loop control system performance evaluation method based on ARMA model

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Embodiment Construction

[0068] The present invention proposes a performance evaluation method based on the impulse response curve for the single input single output (SISO) control loop of the sampling PI controller. This method obtains the impulse response curve and Harris index value of the system by analyzing the time series of historical output data for a period of time, and combining the two indexes to give the controller parameter adjustment suggestions and adjustment range. The method does not need the precise model and transfer function matrix of the system, and only analyzes and processes the output data and delay time of the system. In a thermal power plant with a high level of automation, the DCS control system is adopted, and the operating data is easy to store and obtain, which provides us with abundant resources for analysis and calculations using the operating data.

[0069] Reference figure 2 The performance evaluation method of a single-in-single-out control loop based on impulse respon...

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Abstract

The invention discloses a single-loop control system performance evaluation method based on an ARMA model, which is used for solving the online evaluation problem of a control system. The method comprises the following steps of a, acquiring current moment data of a controlled variable PV of a to-be-evaluated control loop; b, preprocessing output data: removing abnormal data and performing stabilizing processing; c, calculating performance indexes of the control loop; and d, giving optimization suggestions of PI controller parameters according to the performance indexes of the control loop. Thetime series analysis is carried out on the historical output data in a period of time to obtain the performance indexes of the control loop; and an adjusting direction of the PI controller parametersis given according to the performance indexes of the control loop, so that the performance of a controller is optimal. According to the method, an accurate model and a transfer function matrix of thesystem are not needed, and only system operation data and delay time information are needed; the normal operation of the system is not influenced; and the method is suitable for online performance evaluation of an industrial field.

Description

Technical field [0001] The invention relates to a method for accurately evaluating the control performance of a single loop control system, and belongs to the technical field of control. Background technique [0002] About 90% of the controllers in the industrial process are PID controllers, whose control performance is closely related to product quality, operating costs and production safety. In the actual production process, the PID controller parameters are optimized only in the debugging stage. However, with the long-term operation of the loop and the change of the field working conditions, the performance of the controller is degraded, economic benefits and even safety hazards are caused. . Therefore, it is very important to find a suitable method to enable users to understand the difference between the performance of the control loop and the expected control target, so that the problem can be found in time and system performance can be optimized. [0003] In recent years, m...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B23/02
CPCG05B23/0243
Inventor 王印松苏婉婉孙天舒蒋雄杰黄启东高建强刘卫亮
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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