Unlock instant, AI-driven research and patent intelligence for your innovation.

Wind farm flexible direct current access system and start-up control method and device

A flexible DC, access system technology, applied in power transmission AC network, reducing/preventing power oscillation, single-network parallel feeding arrangement, etc. Avoid the effect of medium and high frequency oscillation

Active Publication Date: 2021-04-20
XUJI GRP +2
View PDF4 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Wind farm flexible direct current access system and start-up control method and device
  • Wind farm flexible direct current access system and start-up control method and device
  • Wind farm flexible direct current access system and start-up control method and device

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a flexible DC connection system of a wind farm, a start-up control method and a device. The start-up control methods include: when the offshore converter station is started, the voltage outer loop control mode is adopted, and the PI regulator adopts the first control parameter; The PI regulators in the voltage outer loop and the current inner loop both use the first control parameter; if the system reaches the rated operating condition, the converter station adopts the control mode of the voltage outer loop and the current inner loop , the PI regulators in both the voltage outer loop and the current inner loop adopt the second control parameter. This method is aimed at large-scale wind farms, and can realize the smooth transition of large-scale wind farms from outage to rated operation. It can not only suppress the oscillation during startup, but also not affect the temporary and steady-state characteristics of rated working conditions.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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