Capacity allocation method of wind power plant dynamic reactive power compensation device based on low voltage ride through

A low-voltage ride-through and compensation device technology, applied in reactive power adjustment/elimination/compensation, wind power generation, flexible AC transmission system, etc., can solve the problem of high price of dynamic reactive power compensation devices, and achieve enhanced reactive power/voltage regulation Ability to suppress voltage fluctuations, not easily under-compensated or over-compensated

Active Publication Date: 2014-07-02
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0005] However, if the dynamic reactive power compensation device is used, considering the high price of the dynamic reactive power compensation device, how to determine its reasonable configuration capacity, improve the stability of the power grid and the low-voltage ride-through capability of the wind turbine, and ensure the safety and economy of the power grid operation. is an urgent problem

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  • Capacity allocation method of wind power plant dynamic reactive power compensation device based on low voltage ride through
  • Capacity allocation method of wind power plant dynamic reactive power compensation device based on low voltage ride through
  • Capacity allocation method of wind power plant dynamic reactive power compensation device based on low voltage ride through

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Embodiment Construction

[0039] The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0040] The wind farm is composed of 25 fixed-speed asynchronous wind turbines with a single rated power of 2MW connected in parallel. The outlet voltage of the wind turbine is 0.69kV. It is connected to the internal power grid of the wind farm through a 0.69 / 35kV transformer, and then connected to a 35 / 110kV booster. Station, and connected to the local 110kV power grid through a 5-kilometer transmission line, and the dynamic reactive power compensation device is connected to the low-voltage side busbar of the 35 / 110kV step-up station. The dynamic reactive power compensation device can be SVC or STATCOM, and this embodiment takes SVC as an example, and the grid structure of this embodiment is as follows figure 2 shown.

[0041] to combine figure 1 The planning process,...

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Abstract

The invention discloses a capacity allocation method of a wind power plant dynamic reactive power compensation device based on low voltage ride through. The method sequentially includes the following steps that n fault combination conditions are made according to a set wind power plant low voltage ride through requirement; three-phase shortcircuit faults are set in a power grid, grid connection points sequentially operate under the n fault combination conditions made in the step S1, and the minimum dynamic reactive power compensation capacities Q1 used for enabling a wind power plant to return to operate normally after faults happen are acquired respectively; the maximum value of the Q1 is chosen as the wind power plant dynamic reactive power compensation allocation capacity. The capacity allocation method of the wind power plant dynamic reactive power compensation device based on low voltage ride through is suitable for existing grid connection wind power plant planning, and beneficial to improving the transient voltage stability of a regional power grid of the wind power plant and the low voltage ride through capacity of the wind power plant.

Description

technical field [0001] The invention relates to a dynamic reactive power compensation configuration planning technology of a wind farm, in particular to a capacity configuration method of a dynamic reactive power compensation device of a wind farm based on low voltage ride through. Background technique [0002] In recent years, wind energy, as a clean and abundant renewable green energy, has received more and more attention. Due to the randomness and volatility of wind energy, the grid-connected operation of wind power is facing many problems. How to regulate the reactive power / voltage of the regional power grid containing wind power is one of the important problems. [0003] At present, the reactive power compensation devices commonly used in substations are mainly shunt capacitors and shunt reactors. The adjustment of the compensation capacity is discrete and the adjustment speed is slow. It can only provide minute-level reactive power support. When the wind farm fluctuate...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18
CPCY02E10/763Y02E40/16Y02E40/12Y02E10/76Y02E40/10
Inventor 张勇军陈艳李钦豪
Owner SOUTH CHINA UNIV OF TECH
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