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Generator set multivariable system identification method based on normal operating data

A technology for generating sets and normal operation, applied in general control systems, control/regulation systems, instruments, etc., and can solve problems such as low identification accuracy

Inactive Publication Date: 2014-04-30
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +1
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Problems solved by technology

[0006] Based on this, it is necessary to provide a multi-variable system identification method based on normal operation data for the low identification accuracy of the existing system closed-loop identification technology

Method used

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  • Generator set multivariable system identification method based on normal operating data
  • Generator set multivariable system identification method based on normal operating data
  • Generator set multivariable system identification method based on normal operating data

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Embodiment Construction

[0015] The specific implementation of the method for identifying the multivariable system of a generating set based on normal operating data of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0016] refer to figure 1 as shown, figure 1 It is a flow chart of an embodiment of a method for identifying a multivariable system of a generating set based on normal operating data, including the following steps:

[0017] Step S1: Perform a step response test on the multivariable system of the generating set during normal operation, and obtain input and output signals of each loop of the multivariable system of the generating set.

[0018] In one embodiment, the step response test process of step S1 includes as follows:

[0019] When the multi-variable system of the generator set is running normally, apply the step test signal of the set value to the reference input of each circuit in turn, and keep other reference inputs unchang...

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Abstract

The invention provides a generator set multivariable system identification method based on normal operating data. The method comprises the steps that the step response test is carried out on a generator set multivariable system running normally to obtain input and output signals of loops of the generator set multivariable system, the signal decomposition and the spectral analysis are carried out to obtain the maximum critical frequency of all the loops of the generator set multivariable system, the frequency characteristics of the generator set multivariable system on a plurality of frequency points are calculated according to the maximum critical frequency, and a transfer function matrix model of the generator set multivariable system is established according to the frequency characteristics. According to the technical scheme, the identification process of the strongly-coupled generator set multivariable system is divided into the identification processes of a plurality of single-input and single-output systems, the frequency characteristics of the system in the important frequency bands are determined through the step response test carried out when the systems run normally under the normal running state of the generator set multivariable system, the identification process is simple, the anti-interference capability is high, and the identification precision is high.

Description

technical field [0001] The invention relates to the technical field of multivariable system applications, in particular to a multivariable system identification method for generating sets based on normal operation data. Background technique [0002] The large unit units of modern thermal power plants have the characteristics of large time-delay, time-varying, nonlinear, strong coupling, and large differences in the dynamic characteristics of the machine and furnace. It is a typical multi-input and multi-output process object. The unit unit coordination control system is the most complex system in the automatic control system of the power plant. Its task is to make the unit load closely follow the external load demand and maintain the stability of the front pressure. When the unit operates with a coordinated control system, the boiler, steam turbine and generator are controlled as a unified whole. [0003] Most of the current control methods combine the characteristics of bo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
Inventor 张曦王亚刚陈世和李晓枫朱亚清庞志强史玲玲
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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