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A Fast Synchronization Method for Small Hydropower Stations by Directly Comparing Voltage Sampling Values

A technology of comparing voltage and small hydropower, applied in the direction of single-network parallel feeding arrangement, etc., can solve the problems of reduced reliability of power supply, long recovery time, and long fault detection time

Active Publication Date: 2021-09-21
GUANGZHOU COLLEGE OF SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] This method takes a long time to detect faults, resulting in a long recovery time, which reduces the reliability of power supply
At the same time, when a fault occurs, the distribution network needs to adjust the voltage parameters by cutting off the power supply terminal or the load terminal, which will greatly increase the closing time

Method used

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  • A Fast Synchronization Method for Small Hydropower Stations by Directly Comparing Voltage Sampling Values

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Embodiment Construction

[0021] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] Such as figure 1 As shown, a small hydropower fast synchronization method directly compares voltage sampling values. The small hydropower includes a voltage transformer and a fast synchronization system. The voltage transformer will collect the small hydropower side voltage U X and distribution network voltage U L sent to the fast synchronous system, and the fast synchronous system converts the small hydropower side voltage U X and distribution network voltage U L For comparison, the fast synchronous system controls the reclosing start of the small hydropower station according to the comparison result.

[0023] The quick synchronization of small hydropower includes the following steps:

[0024] a). Whether the small hydropower trip is detected; if yes, proceed to step b);

[0025] b). Fast synchronous system startup, rando...

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Abstract

The invention provides a fast synchronizing method for small hydropower that directly compares voltage sampling values. The small hydropower includes a voltage transformer and a fast synchronization system, and the voltage transformer will collect the voltage U X and distribution network voltage U L sent to the fast synchronous system, and the fast synchronous system converts the small hydropower side voltage U X and distribution network voltage U L Compare, fast synchronous system controls the reclosing switch start of small hydropower according to comparison result; In the present invention, collection point is selected at random, has improved the reliability of method like this; By small hydropower side voltage U X and distribution network voltage U L Carry out direct comparison, when the two are close to the grid, the method is simple and convenient, and the power outage time is shortened; by judging whether a / n≥0.8 is true, this avoids the fluctuation of the voltage itself or the mismeasurement of the voltage sampling that affects the authenticity of the data .

Description

technical field [0001] The invention relates to the field of grid connection of small hydropower, in particular to a fast synchronizing method for small hydropower directly comparing voltage sampling values. Background technique [0002] The existing closing schemes all require a long waiting time, and at the cost of decoupling all small power sources in the area, reclosing after decoupling the small hydropower will require the reconnection of the small hydropower grid. At this time, for distributed small hydropower As far as hydropower is concerned, it will take a lot of time to re-connect to the grid, and the operation is also very cumbersome, which will take a long time to restore the normal grid operation mode. [0003] The existing implementation scheme adopts the existing smart electronic equipment for small hydropower grid connection, and mostly uses the full-wave Fourier algorithm, which requires at least one cycle of data window (20ms), and the calculation process i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/40
CPCH02J3/40
Inventor 王玕张紫凡王智东陈志峰林涛莫锐
Owner GUANGZHOU COLLEGE OF SOUTH CHINA UNIV OF TECH
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