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Wind power station island emergent cutting method based on mixing index

A technology for wind farms and machine cut-offs, applied in wind power generation, single-network parallel feeding arrangements, etc., can solve problems affecting system safety and stability, frequent wind farm off-grid accidents, failure to complete reclosing, etc., to ensure power supply safety , power supply recovery, and the effect of ensuring power supply quality

Active Publication Date: 2018-01-09
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this reclosing mode, the small power supply side often fails to detect the synchronization, and the reclosing cannot be completed.
This has led to frequent off-grid accidents of wind farms, affecting the safety and stability of the system

Method used

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  • Wind power station island emergent cutting method based on mixing index
  • Wind power station island emergent cutting method based on mixing index
  • Wind power station island emergent cutting method based on mixing index

Examples

Experimental program
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Embodiment Construction

[0028] The present invention mainly includes a calculation module of the minimum cut-off quantity and a cut-off module. Wherein: the minimum cutting amount calculation module is collected and based on figure 1 The schematic diagram shown in the schematic diagram calculates the equivalent power angle and inertia time constant of the wind farm at the time of the fault to calculate the limit reclosing time, and finds the minimum cut-off amount; the cut-off module first calculates the mixed cut-off of each fan Machine index CPI and sort out the priority level, and then according to the priority level from high to low, cut the machine until the amount of cutting machine is greater than the minimum amount of cutting machine.

[0029] Such as figure 2 with image 3 As shown, a wind farm isolated island emergency shutdown method based on mixed indicators includes the following steps: (1) load the real-time state quantities of each fan in the wind farm at the moment of action of the...

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Abstract

The invention discloses a wind power station island emergent cutting method based on mixing index. When a junctor of the wind power station breaks down, two index including voltage and frequency, which are closely related to the self-protection of a blower fan. Mixing weight is conducted on the voltage and frequency based on the change speed ratio, obtaining an integrated cutting index. Priority division is conducted on the blower fan in the wind power station by means of the integrated cutting index. The blower fan having high priority is cut at first to stabilize the whole wind power stationand prevent the network removing of the linked blower fan caused by index deterioration. The invention is advantageous in that the aim of stabilizing the index of the wind power station can be achieved; it is guaranteed that when the junctor breaks down, the wind power station can stably pass the island operation period; compared with other cutting method, the two important indexes of voltage andfrequency are taken into consideration comprehensively; operation is simple; feasibility and utility are good.

Description

technical field [0001] The invention relates to the field of power system control, in particular to a method for emergency shutdown of wind farm islands based on mixed indexes. Background technique [0002] Wind energy is a renewable clean energy. Its wide sources and non-polluting characteristics make the use of wind power generation a common choice for countries all over the world. But wind power itself has certain limitations. There is no coupling relationship between the speed of the doubly-fed induction generator and the grid frequency. After the tie-line fails, there is a time interval of about 1.5s between the action of the tie-line protection and the reclosing of the tie-line. During this 1.5s, the island operation Most of the wind farms in the wind farm will be off-grid due to their own frequency or voltage protection action, and according to China's "3 ~ 110kV Power Grid Relay Protection Device Operation Setting Regulations", for the selection of 110kV double-ende...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCY02E10/76
Inventor 张天琪赵剑锋
Owner SOUTHEAST UNIV
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