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Wind power plant flexible direct current access system and starting control method and device

A flexible DC and access system technology, applied in the direction of power transmission AC network, reducing/preventing power oscillation, single-network parallel feeding arrangement, etc., can solve problems such as wide-frequency domain oscillation, achieve resonance suppression, broadband oscillation suppression, and reduce The effect of LFO risk

Active Publication Date: 2020-04-28
XUJI GRP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a wind farm flexible DC access system and start-up control method and device to solve the problem of wide-frequency domain oscillation when the existing wind farm starts

Method used

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  • Wind power plant flexible direct current access system and starting control method and device
  • Wind power plant flexible direct current access system and starting control method and device
  • Wind power plant flexible direct current access system and starting control method and device

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Embodiment 1

[0031] The wind farm flexible DC access system (hereinafter referred to as the system) proposed in this embodiment, such as figure 1 As shown, taking the output voltage level of 220KV as an example, it includes offshore wind farms and offshore converter stations (i.e., flexible DC offshore converter stations). The offshore wind farm contains several wind turbines (including grid-connected kV fan step-up transformer), these fans are connected to the low-voltage side of the wind farm step-up transformer (referred to as step-up transformer) through a 35kV collection line (that is, the collection submarine cable), and the high-voltage side of the wind farm step-up transformer is connected to the wind farm through a submarine cable. The connection transformer of the offshore converter station (referred to as the connection transformer), the connection transformer and the offshore converter station are usually located on the same offshore platform, and the two are connected through t...

Embodiment 2

[0080] The difference between the wind farm flexible DC access system proposed in this embodiment and Embodiment 1 is that the scale of the system proposed in this embodiment is small, and the system can switch to the normal operation mode only when the system reaches the rated operating condition. The process of the critical operation scale is not involved in the process, and the connection relationship of the system and the startup of the hot standby state are exactly the same as those in Embodiment 1, and will not be repeated here.

[0081] The process of the control method adopted by the flexible DC access system of the wind farm in this embodiment is as follows:

[0082] When the converter station is started, the voltage outer loop control mode is adopted, and the PI regulator adopts the first control parameter;

[0083] When the system reaches the rated operating condition, the converter station adopts the control mode of the voltage outer loop and the current inner loop...

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Abstract

The invention relates to a wind power plant flexible direct current access system and a starting control method and device. The starting control method comprises the steps that when an offshore converter station is started, a voltage outer loop control mode is adopted, and a PI regulator adopts a first control parameter; if the unlocking number of the fans in the wind power plant reaches a critical operation scale, the converter station adopts a control mode of a voltage outer loop and a current inner loop, and PI regulators in the voltage outer loop and the current inner loop adopt first control parameters; and if the system reaches the rated operation condition, the converter station adopts a control mode of the voltage outer loop and the current inner loop, and the PI regulators in thevoltage outer loop and the current inner loop adopt second control parameters. According to the method, for a large-scale wind power plant, stable transition of the large-scale wind power plant from outage to rated operation can be achieved, oscillation in the starting process can be restrained, and the transient and steady state characteristics under the rated working condition are not affected.

Description

technical field [0001] The invention relates to a flexible direct current access system of a wind farm, a start-up control method and a device, and belongs to the technical field of flexible direct current transmission and large-scale new energy grid connection. Background technique [0002] With the increasing shortage of energy and environmental protection issues, as well as the country's planning and support for new energy industries, offshore wind power has attracted the attention of coastal countries around the world due to its characteristics of not occupying land on land and rich wind energy resources. Offshore wind power will welcome To develop on a large scale, and more and more to the direction of long-distance deep sea expansion. [0003] With the increase of offshore distance, the AC transmission method can no longer meet the demand, and the flexible DC connection method has become the preferred method for large-scale offshore wind power transmission. However, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/24H02J3/38
CPCH02J3/24H02J3/36Y02E60/60
Inventor 刘启建李道洋刘欣和杨美娟王先为行登江胡少花钱芳
Owner XUJI GRP