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A method for drawing voltage withstand curve in thermal power plants

A kind of endurance, thermal power plant technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve problems such as insulation damage, loss of load, overvoltage tripping, etc., to achieve the effect of economical and stable operation

Active Publication Date: 2020-02-18
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Voltage sags may cause power shortages and load loss, and voltage swells may cause faults such as insulation damage, overvoltage tripping, and overexcitation

Method used

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  • A method for drawing voltage withstand curve in thermal power plants
  • A method for drawing voltage withstand curve in thermal power plants
  • A method for drawing voltage withstand curve in thermal power plants

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Embodiment Construction

[0019] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0020] The invention provides a voltage tolerance curve drawing method that is concise, efficient, easy to calculate and has no influence on the normal operation of the actual control system.

[0021] In order to evaluate the sensitivity of the sensitive equipment, the invention provides a method for drawing the voltage tolerance curve of the sensitive equipment. The specific implementation of this method is as follows:

[0022] 1. The closed-loop transfer function G(s) expression of the control process is obtained by modeling the thermal power plant

[0023] attached figure 1 Among them, R(s) represents the rated input quantity, E(s) represents the deviation between the input quantity and the feedback quantity, P(...

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Abstract

The invention discloses a voltage tolerance curve drawing method for thermal power plant sensitive equipment. The method comprises the steps of system complex frequency modeling, voltage sag (or voltage swell) simulation and time domain equation solving and analysis; for system complex frequency modeling, the thermal power plant technology process is converted into a continuous system transfer function model; for voltage sag (or voltage swell) simulation, a step function is used for simulating a voltage sag (or voltage swell) signal which is likely to be borne during equipment running; for time domain equation solving and analysis, evaluation on the voltage tolerance level of the sensitive equipment is achieved. The voltage tolerance curve drawing method is simple and precise.

Description

technical field [0001] The invention belongs to the field of power systems, in particular to a method for drawing voltage tolerance curves of thermal power plant sensitive equipment in terms of power quality. Background technique [0002] The voltage withstand curve is an important method to evaluate the sensitivity of sensitive equipment to voltage sags (or swells), and the resulting state of sensitive equipment can be intuitively obtained. Voltage sags can lead to loss of load due to power shortages, and voltage swells can cause faults such as insulation damage, overvoltage trips, and overexcitation. A simple and convenient method for drawing voltage withstand curves, which can provide good operation guidance for on-site control engineers, and can accurately control the voltage sag (or swell) of equipment in advance, thereby improving the power produced by thermal power plants quality. Contents of the invention [0003] The technical scheme of the invention is a method...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
CPCG01R31/003
Inventor 孟庆伟刘思怡李家腾康忠健
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)