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A method and device for judging the conversion of large and small grid operating conditions by the governor of a hydropower plant

A discrimination method and governor technology, applied in the field of power system, can solve the problems of untimely, inaccurate conversion judgment, etc., and achieve the effect of preventing misjudgment, avoiding misjudgment, and solving the working condition that cannot normally enter the large network.

Active Publication Date: 2021-11-05
NANJING NARI GROUP CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] In order to solve the above problems, the present invention proposes a method and device for discriminating the switching between large and small network operating conditions by the governor of a hydropower plant, so as to realize the decision output of the conversion between the large network and the small network, and solve the problem of the current governor for the large network. The technical problem of inaccurate and untimely conversion judgment between the small network and the small network

Method used

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  • A method and device for judging the conversion of large and small grid operating conditions by the governor of a hydropower plant
  • A method and device for judging the conversion of large and small grid operating conditions by the governor of a hydropower plant
  • A method and device for judging the conversion of large and small grid operating conditions by the governor of a hydropower plant

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Experimental program
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Embodiment 1

[0033] A hydropower governor is a discrimination method of large, small network working conditions, and makes full use of external data information, and extracts, processing, processing, and proposes a reasonable logic judgment. The specific steps are as follows:

[0034] 1) Judgment whether it is met to meet the conditions of the large network working conditions into the small network working conditions, if the condition is satisfied, it is determined that the power grid is transferred to the small network operating conditions;

[0035] The power network is transferred from the large network operating conditions to the small network working condition: the GCB circuit breaker is placed in the closing position, the system frequency exceeds the preset frequency, and the generator set does not appear frequency hopping failure;

[0036]2) Judging whether it is met to meet the conditions of the small network working conditions into the big network working condition, if the condition is...

Embodiment 2

[0039] On the basis of the first embodiment, it is determined whether or not the generator set has a frequency hopping fault, calculates the slope of the generator set frequency curve. If the slope exceeds the set slope value, it is determined that the frequency sampling distortion, the cumulative distortion, and the number of times exceeds the number of times The threshold preset value θ is determined to have a frequency hopping failure. This method can perform validity of frequency hopping, eliminate invalid data, and draw effective data. The specific method is:

[0040] Two points are collected on the generator set frequency curve, calculate the slope between the two-point frequency, if the slope is greater than the set slope value, then count once; thus cycle, if the count value is greater than the gate preset value θ, That is, it is determined that the frequency jump fault is displayed. When the manual reset fault is cleared, the numerical value is re-count, and if the value ...

Embodiment 3

[0050] Based on the first embodiment, it is determined whether or not the power generator set frequency is: continuous sampling of the preset time period in the generator set frequency, in a preset time period, satisfying the set condition, determining the frequency of generator sets, Otherwise, it is determined that the frequency of generator sets is unstable, and the determination is re-judging, the setting condition is the amount of sampling point in the preset frequency range of the generator set, which exceeds the set threshold, ie the utilization probability The statistical method determines the frequency stability of the unit.

[0051] In this embodiment, according to the probability statistics, the governor is continuously sampled for a preset time period for a preset time period every three minutes. During the preset time period, it is determined that the system frequency has been stabilized. One of the basic conditions of the big network, otherwise it will be re-judgment...

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Abstract

The invention discloses a method and device for judging the switching between large and small network working conditions by a governor of a hydropower plant. The working condition of the large network is transferred to the working condition of the small network, and the conditions for the power grid to be transferred from the large network to the small network are as follows: the GCB circuit breaker is placed in the closing position, the system frequency exceeds the preset frequency, and the generator set does not appear frequency jump Change failure; judge whether the conditions for changing from small grid working condition to large grid working condition are satisfied. The condition of the situation is: the GCB circuit breaker is placed in the closing position, the frequency of the generating set is stable, and the decision output of the conversion between the large network and the small network is realized, and the current governor is inaccurate in judging the conversion between the large network and the small network. Untimely technical issues.

Description

Technical field [0001] The present invention belongs to the technical field of power system, and more particularly to a method and apparatus for the conversion of a hydropower plant governor on large, small network working conditions. Background technique [0002] The power system is different from the proportion of power grid load and power generation capacity, and there are two basic states and conditions of the large network and small network in actual operation. Generally, the definition of the two is, when the total power generation power of power generation is smaller than the power grid load in the power system 8% of the total, that is, it is considered to be a big network, otherwise it is a small network, this definition or principle is clear. Since the big net has natural self-stability, it is also a power grid structure of power mainstream, so most of my country's regional and regional power grids are mostly in large network state, and all power control equipment contro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00H02J3/38
CPCH02J3/00H02J3/381H02J2203/20
Inventor 荣红金黎明刘欣宇靳光永陈涛何林波钱凤秦晓峰吴春旺陈逸鸣
Owner NANJING NARI GROUP CORP
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