A control method of reactive power compensation device for preventing large-scale wind turbines from being disconnected from the grid

A technology of compensation device and wind turbine, which is applied in the direction of continuous tuning of components, etc., to achieve the effect of avoiding overvoltage problems, preventing cascading failures, and avoiding the expansion of failures

Active Publication Date: 2016-09-07
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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  • A control method of reactive power compensation device for preventing large-scale wind turbines from being disconnected from the grid
  • A control method of reactive power compensation device for preventing large-scale wind turbines from being disconnected from the grid
  • A control method of reactive power compensation device for preventing large-scale wind turbines from being disconnected from the grid

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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. Such as 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 mat...

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Abstract

The invention discloses a control method of a reactive power compensation device for preventing large-scale wind turbines from being disconnected from the grid, and belongs to the technical field of wind power generation. The invention sets the limit value of the low-voltage operation of the reactive power compensation device. When the voltage of the grid-connected point is lower than the value, it is judged that the grid is faulty, and the grid-connected switch will be automatically disconnected; after the fault is removed, the system control center will operate according to the network The state issues input commands to some reactive power compensation devices to ensure that the voltage quickly returns to the standard value. The invention can effectively avoid expansion of wind power system faults and prevent cascading faults.

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...

Claims

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Application Information

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Patent Type & Authority Patents(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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