On-line monitoring and analysis method of excitation system regulation performance based on phasor measurement technology

A technology of excitation system and phasor measurement, which is applied in the field of power grid, can solve the problems of lack of accuracy and achieve the effect of convenient testing

Active Publication Date: 2011-12-28
NARI TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the performance parameters of the unit excitation system are basically reported by the power plant itself, and then evaluated by the operation management agency. Such evaluation methods and results are obviously lacking in accuracy.

Method used

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  • On-line monitoring and analysis method of excitation system regulation performance based on phasor measurement technology
  • On-line monitoring and analysis method of excitation system regulation performance based on phasor measurement technology
  • On-line monitoring and analysis method of excitation system regulation performance based on phasor measurement technology

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Embodiment Construction

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and examples. However, the invention is not limited to the examples given.

[0034] This example includes a unit machine terminal voltage drop disturbance, the response process of the excitation system voltage rise adjustment, and the method of the present invention is used to detect and calculate the dynamic performance characteristics of the excitation adjustment during the disturbance process on-line and in real time.

[0035] figure 1 U is the generator terminal voltage, I is the generator terminal current, U f is the excitation voltage, I f is the excitation current.

[0036] (1) Unit disturbance detection and excitation response action judgment

[0037] Disturbance detection calculation formula: ΔU(t 1 )=(U(t 1 )-U(t 1 +Δt)) / U(t 1 ) (4)

[0038] ΔI(t 1 ) = I(t 1 +Δt)-I(t 1 ) (5)

[0039] Excitation response action judgment:

[0040] ΔU f (t 1...

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Abstract

The invention discloses a method for online monitoring and analyzing adjustment performance of an excitation system based on a phasor measurement technology. The method comprises the following steps of: (1) online monitoring change conditions of key electric parameters, such as terminal voltage/current, excitation voltage and the like by utilizing real-time PMU (Power Management Unit) data of a machine set collected by a phasor measurement unit and the excitation system thereof, and detecting disturbance generation of the machine set and adjustment action response of the excitation system in real time; and (2) analyzing dynamic behaviour characteristics of the excitation system of a computing machine set in a disturbance process in real time, wherein the dynamic behaviour characteristics include parameters, such as disturbance occurrence time, a maximum value of excitation voltage/current and occurrence time thereof, terminal voltage steady time, voltage static adjustment rate before/after disturbance, excitation voltage multiple, voltage response time of the excitation system, voltage transient adjustment rate and the like. The method disclosed by the invention can be operated online and can be used for testing conveniently without special requirement limitation. The method can be applied to carrying out online detection, analysis and evaluation reference of the dynamic adjustment performance of the operated excitation system.

Description

technical field [0001] The invention belongs to the technical field of power grids, and more precisely relates to an online monitoring and analysis method for the regulation performance of a generator excitation system, in particular to an online monitoring and analysis method for the regulation performance of an excitation system based on phasor measurement technology. Background technique [0002] The generator excitation system is an important control unit of the synchronous generator, and its dynamic adjustment performance has a direct impact on the stability and reliability of the generator and power system operation. At present, in order to analyze and evaluate the performance of the excitation system, and at the same time, in order to avoid interference with the normal operation of the power grid, the conventional test method is to conduct a separate offline test of the excitation system, which not only requires a lot of preparatory work but also cannot It is often pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/34
Inventor 王波陆进军戴则梅
Owner NARI TECH CO LTD
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