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Reactive power compensation device control method for preventing large-scale chain offline of wind generation sets

A compensation device, wind turbine technology, applied in the direction of continuous tuning of components, etc., to prevent cascading failures, avoid failure expansion, and avoid overvoltage problems

Active Publication Date: 2014-01-22
STATE GRID ELECTRIC POWER RES INST +1
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  • Abstract
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Problems solved by technology

[0005] The purpose of the present invention is to provide a control method for reactive power compensation devices used to prevent large-scale wind turbines from being disconnected from the grid in response to the problem of voltage drops caused by short-circuit faults in wind power systems, and to realize emergency control of reactive power compensation devices in the grid , so as to prevent the wind turbine from being disconnected from the grid due to overvoltage, and suppress the scope of the accident

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  • Reactive power compensation device control method for preventing large-scale chain offline of wind generation sets
  • Reactive power compensation device control method for preventing large-scale chain offline of wind generation sets
  • Reactive power compensation device control method for preventing large-scale chain offline of wind generation sets

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[0024] The present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0025] figure 1 It is a flowchart of the method of the present invention. like figure 1 Shown, the inventive method comprises the following steps:

[0026] 1) Set the low-voltage operation limit value Ul of each reactive power compensation device. Ul can adopt the lowest voltage value under the normal operation state of the power grid without short-circuit faults.

[0027] 2) The system control center receives the voltage amplitude of each main node and the reactive power data output by each reactive power compensation device in real time, and at the same time updates the reactive voltage sensitivity of the node where each reactive power compensation device is located to each main node. The reactive voltage sensitivity of the nodes where each reactive power compensation device is located to each main node can be solved and updated using a mature...

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Abstract

The invention discloses a reactive power compensation device control method for preventing large-scale chain offline of wind generation sets and belongs to the technical field of wind power generation. The reactive power compensation device control method comprises the following steps: a low-voltage running limit of reactive power compensation devices is set and when the voltage of a grid connection point is lower than the low-voltage running limit, that a power grid fault occurs is judged, and a grid connection switch is automatically disconnected; after the fault is removed, input commands are issued to part of the reactive power compensation devices by a system control center according to the network operation state to ensure that the voltage rapidly returns to the standard value. Through the adoption of the method, the fault of a wind power system can be effectively prevented from being expanded and the chain faults are prevented.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and more precisely, the invention relates to a control method of a reactive power compensation device used for preventing large-scale wind turbines from being disconnected from the grid. Background technique [0002] The cascading off-grid accident of large-scale wind turbines is one of the new problems that have emerged during the rapid development of cluster wind power in my country. The low-voltage ride-through capability of wind turbines is considered to be the main factor for the occurrence and propagation of these cascading faults. However, through the simulation analysis of wind turbine chain disconnection, it can be found that the lack of low-voltage ride-through capability of wind turbines is indeed the main factor leading to the first batch of wind turbine disconnection, but the subsequent chain disconnection is due to excess reactive power in the grid, resulting in The v...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03J3/16
Inventor 罗剑波李雪明许士光陈永华陈汹汤奕
Owner STATE GRID ELECTRIC POWER RES INST
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