Non-linear robust fault detection method for generator car based on observer

A technology for fault detection and power generation. It is used in instruments, electrical testing/monitoring, testing/monitoring control systems, etc., and can solve problems such as few fault detection methods and no consideration of interference and uncertainty.

Pending Publication Date: 2022-06-03
HANGZHOU ELECTRIC EQUIP MFG +2
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Problems solved by technology

However, in the presence of unknown inputs, even if the system is not faulty, the residuals will not be zero. Existing fault detection often does not consider ...

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  • Non-linear robust fault detection method for generator car based on observer
  • Non-linear robust fault detection method for generator car based on observer
  • Non-linear robust fault detection method for generator car based on observer

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Embodiment Construction

[0088] The present invention will be described in further detail below with reference to the accompanying drawings, but it is not intended to limit the protection scope of the present invention.

[0089] like Figure 1-3 As shown, the core of the present invention is to provide an observer-based nonlinear robust fault detection method for power generation, which can consider the influence of uncertainty and disturbance, is sensitive to faults, and is robust to disturbances. Firstly, a synchronous generator model is established, the required parameters are calculated, the observer is used to observe, the state space model expression is calculated, the Lipschitz nonlinear equivalent model is established, and then the fault modeling is carried out, the residual error is calculated and the fault threshold is calculated, and the residual error is calculated. The peak norm is compared with the residual threshold to determine whether a fault alarm is required.

[0090] An observer-b...

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Abstract

The invention discloses a generator car nonlinear robust fault detection method based on an observer, and the method comprises the steps: 1, building a dynamic model of a generator car, considering a distributed model of the generator car and a phasor measurement unit at a high-voltage side of a transformer, and obtaining a needed output measurement value on a bus at the high-voltage side of the transformer; (2) observing by an observer to obtain a state space model expression, and establishing a Lipschitz nonlinear equivalent model; (3) fault modeling is carried out, fault vectors representing all possible faults are obtained, residual errors are calculated, and a fault threshold value is calculated through a residual error peak value; and (4) designing a fault diagnosis filter, and providing a fault detection (FD) scheme based on a nonlinear observer. According to the method, the influence of interference and model uncertainty is considered, a nonlinear model influenced by disturbance is adopted, and the method can be used for nonlinear robust fault detection of the generator car.

Description

technical field [0001] The invention relates to the field of power system fault diagnosis, in particular to an observer-based nonlinear robust fault detection method for a generator car. Background technique [0002] Among the various energy sources in nature, electric energy has the outstanding characteristics of large-scale centralized production, long-distance economic transmission, and intelligent automatic control. It has not only become the main energy source for human production and life, but also has played an important role in the generation and development of modern human civilization. important impetus. With the rapid development of the country, the continuous development of social and economic level and the continuous enrichment of people's material life, the demand for electricity is increasing day by day. At this time, along with the modification of the power system structure, the change of the operating environment, the advancement of communication infrastruc...

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Application Information

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IPC IPC(8): G05B23/02
CPCG05B23/0243G05B2219/24065Y04S10/22
Inventor 郭强汪李忠俞啸玲张旭峰胡翔缪宇峰周念成
Owner HANGZHOU ELECTRIC EQUIP MFG
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