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Unplanned island effect small hydropower station system coping processing method and device

A technology of islanding effect and processing method, applied in the field of microgrid, can solve problems such as failure of electronic and automation equipment, inability to adjust frequency and power in time, and product quality degradation.

Active Publication Date: 2021-01-01
广东电网有限责任公司韶关供电局
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] There are many small hydropower installations in my country and they are widely distributed. Because of its small installed capacity, it has accelerated the full development and utilization of hydropower resources, and has been built with low cost. However, sometimes unplanned situations such as failures occur in the main network. The unplanned island effect of the small hydropower grid has affected part of the small hydropower grid, and usually the small hydropower grid cannot adjust the frequency and power in a timely manner. power supply efficiency of the grid
[0003] At present, the only way to eliminate the impact of the unplanned island effect is to disconnect the small hydropower installations, but this will cause power outages for the loads in the grid. Frequent sudden power outages will deteriorate the quality of power supply, resulting in shortened load life and product quality. The failure of automation equipment affects the daily life of users, reduces the reliability of electricity consumption by users, and causes waste of water resources, which reduces the efficiency of small hydropower. If the recovery time of the main network is too long, small hydropower will be restarted and connected to the network. The time is too long, resulting in long-term power outages for users

Method used

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  • Unplanned island effect small hydropower station system coping processing method and device

Examples

Experimental program
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Effect test

Embodiment 1

[0043] figure 1 It is a flowchart of a method for dealing with an unplanned island effect in a small hydropower system provided by an embodiment of the present invention. The method for dealing with unplanned islanding effects in small hydropower systems can be executed by the device for dealing with unplanned islanding effects in small hydropower systems provided in the embodiments of the present invention, and the device can be implemented in the form of software and / or hardware. Such as figure 1 As shown, the method may specifically include the following:

[0044] S110 , after monitoring the failure of the main grid, control the circuit breaker on the high voltage side of the main transformer between the small hydropower system and the main grid to be disconnected.

[0045] Among them, when the grid supplies power, the main grid sometimes fails suddenly, for example, the main grid circuit is broken, the main grid is short-circuited, etc., which cause the voltage frequency...

Embodiment 2

[0065] On the basis of the above-mentioned embodiments, this embodiment further optimizes the time when the frequency change of the switching power exceeds the limit. Specifically, figure 2 A flow chart for obtaining the frequency change time limit of the switching power provided by the embodiment of the present invention, the steps of obtaining the frequency change time limit of the switching power may specifically include the following steps:

[0066] S210. Calculate the rate of change of the limit-exceeding time corresponding to the switching power.

[0067] Specifically, on the basis of the above-mentioned embodiments, by exchanging the power P change Adjust the limit active power P with the electromechanical unit in the small hydropower system TM for comparison, ensure that the exchange power P change Within the controllable limit when the small hydropower system unit is running stably, the exchange power P can be further obtained change The frequency change over-limi...

Embodiment 3

[0079] image 3 It is a schematic structural diagram of an unplanned island effect small hydropower system coping treatment device provided by an embodiment of the present invention. Such as image 3 As shown, the device may include:

[0080] The monitoring and control module 310 is configured to control the circuit breaker on the high-voltage side of the main transformer between the small hydropower system and the main grid to disconnect after detecting a failure of the main grid.

[0081] The power measurement module 320 is used to measure and obtain the exchanged power between the small hydropower system and the main grid.

[0082] The power comparison module 330 is used to determine that the absolute value of the exchange power is less than or equal to the regulation limit active power of the electromechanical unit in the small hydropower system, and the reactive exchange power between the small hydropower system and the main grid is less than or equal to the electromech...

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Abstract

The invention discloses an unplanned island effect small hydropower station system coping processing method and device. The method comprises the steps of controlling a circuit breaker on the high-voltage side of a main transformer between a small hydropower system and a main power grid to be disconnected after monitoring that the main power grid fails, measuring to obtain exchange power between the small hydropower system and the main power grid, and determining that the absolute value of the exchange power is smaller than or equal to electromechanical group regulation limit active power in the small hydropower system, if the reactive exchange power between the small hydropower station system and the main power grid is smaller than or equal to the electromechanical group regulation limit reactive power in the small hydropower station system, obtaining the frequency change off-limit time of the exchange power, determining that the frequency change off-limit time is smaller than the electromechanical group regulation time of the small hydropower station system, and according to the exchange power, adjusting output power of the electromechanical group of the small hydropower station system to realize the stable operation of the small hydropower station system, so that the unplanned island effect in the small hydropower station system can be eliminated, and the normal power supplyof the small hydropower station system to the load is maintained.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of micro-grids, and in particular to a method and device for dealing with unplanned islanding effects in small hydropower systems. Background technique [0002] There are many small hydropower installations in my country and they are widely distributed. Because of its small installed capacity, it has accelerated the full development and utilization of hydropower resources, and has been built with low cost. However, sometimes unplanned situations such as failures occur in the main network. The unplanned island effect of the small hydropower grid has affected part of the small hydropower grid, and usually the small hydropower grid cannot adjust the frequency and power in a timely manner. power supply efficiency of the grid. [0003] At present, the only way to eliminate the impact of the unplanned island effect is to disconnect the small hydropower installations, but this will cause power ...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/48H02J3/50
CPCH02J3/388H02J3/48H02J3/50H02J2300/20
Inventor 欧阳本凯阙胜和黄伟黄玉琛庄泽宏
Owner 广东电网有限责任公司韶关供电局
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