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A low-frequency oscillation discrimination method and system based on generator power signal

A generator power and low-frequency oscillation technology, which is applied in the direction of motor generator testing, electricity measurement, and electrical variable measurement, can solve the problems of signal output inherently long delay, long time, and poor anti-interference ability, and achieve short calculation time , less data processing and high accuracy

Active Publication Date: 2022-07-19
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional power transmitters mostly use analog transmitters, the time is relatively long, the inherent delay of signal output is long, the anti-interference ability is poor, and it is easy to be interfered, resulting in distortion of the output power signal. The generator power signal output by the analog transmitter cannot accurately reflect the real operating conditions of the generator

Method used

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  • A low-frequency oscillation discrimination method and system based on generator power signal
  • A low-frequency oscillation discrimination method and system based on generator power signal
  • A low-frequency oscillation discrimination method and system based on generator power signal

Examples

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Embodiment 1

[0034] This embodiment provides a method for judging low-frequency oscillation based on a generator power signal, the flowchart of which is as follows figure 1 shown, it includes the steps:

[0035] 1) Real-time measurement of the power signal P of the generator set of the prime mover 0 ;

[0036] 2) Connect the generator power signal P 0 Divide by the rated power P of the unit e Get the power per unit value P u , for the power per unit value P u Perform band-pass filtering to filter out high-frequency components and low-frequency components to obtain the effective power per unit value P, and set the upper and lower limits P max and P min , when the effective power per unit value P is greater than P max The timer is 1, when the effective power per unit value P is less than P min The timepiece is -1, 1 and -1 alternately appear once to count 1, and the count is N within the counting time t, and N is divided by t to obtain the frequency f of the power change P ;

[003...

Embodiment 2

[0041] This embodiment provides a low-frequency oscillation discrimination system based on a generator power signal, such as Image 6 shown, it includes:

[0042] The generator power measurement module is used to measure the generator power of the prime mover in real time and output it to the power per unit value calculation module;

[0043] The power per unit value calculation module is used to calculate the generator power per unit value signal and output it to the power per unit value signal filtering module;

[0044] The power per-unit signal filtering module is used to perform band-pass filtering on the power per-unit signal, filter out high-frequency and low-frequency components, become the effective power per-unit signal, and output it to the effective-power per-unit signal screening module;

[0045] The effective power per unit value signal screening module is used to screen the effective power per unit value signal, and input the screening result to the effective pow...

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Abstract

The invention discloses a low-frequency oscillation discrimination method and system based on a generator power signal. The technical scheme adopted by the method of the present invention is: 1) real-time measurement of the generator power signal of the prime mover unit; 2) dividing the generator power signal by the rated power of the unit to obtain the power per unit value, and performing band-pass filtering on the power per unit value, Filter out high-frequency components and low-frequency components, get the effective power per unit value, and set its upper and lower limits P max and P min , when the effective power per unit value is greater than P max The timer is 1, when the effective power per unit value is less than P min The timepiece is ‑1, 1 and ‑1 appear alternately to count 1, and the count is N within the counting time t, and N is divided by t to obtain the frequency f of the power change P ; 3) When the power changes the frequency f P greater than the set value f Pd , it is determined that the prime mover has low-frequency forced oscillation; when f P less than or equal to the set value f Pd , then re-measure the generator power signal of the prime mover. The invention can quickly detect and judge the occurrence of low-frequency forced oscillation of the prime mover by using the existing signal of the power transmitter.

Description

technical field [0001] The invention belongs to the field of low-frequency oscillation of electric power systems, and relates to the discrimination of forced oscillation when a prime mover is disturbed, in particular to a low-frequency oscillation discrimination method and system based on a generator power signal. Background technique [0002] In recent years, after a large number of AC and DC UHV power transmission projects have been put into operation, the pattern of one power grid in the country has basically been formed, which greatly facilitates the allocation of energy resources across the country and solves the contradiction between power supply and demand in some areas. , but it also brings or magnifies some problems, such as the problem of low-frequency oscillation of the power system, and the problem of insufficient primary frequency regulation capability of the UHV receiving-end power grid. Low frequency oscillation of power system refers to a power angle stabilit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/34G01R31/00
CPCG01R31/343G01R31/00
Inventor 张宝丁阳俊顾正皓鲍文龙高宽应光耀
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY