DFIG and SVC reactive emergency coordination control method in wind power plant

A coordinated control, wind farm technology, applied in reactive power adjustment/elimination/compensation, wind power generation, electrical components, etc., and can solve problems such as large-scale off-grid and fluctuating fans

Inactive Publication Date: 2020-05-01
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the shortcomings of the existing reactive power emergency control scheme, the purpose of the present invention is to provide a reactive power emergency coordination control method of DFIG and SVC in the wind farm, which is used to solve the large-scale fluctuation of the grid-connected point voltage of the wind farm during the fault period and cause large-scale wind turbines. The problem of off-grid provides a reference for the transient voltage stability control of the power grid after a fault

Method used

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  • DFIG and SVC reactive emergency coordination control method in wind power plant
  • DFIG and SVC reactive emergency coordination control method in wind power plant
  • DFIG and SVC reactive emergency coordination control method in wind power plant

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Embodiment 1

[0046] figure 1 It is a flowchart of a reactive power emergency coordinated control method of DFIG and SVC in a wind farm. figure 1 Among them, a kind of reactive power emergency coordinated control method of DFIG and SVC in a wind farm provided by the present invention includes:

[0047] S1: Set the reference voltage threshold for DFIG to participate in reactive power support, and the reference voltage threshold for SVC switching operation;

[0048] S2: Based on the grid-connected point voltage, DFIG machine terminal voltage and Crowbar protection action information, adjust the operating status of the wind turbine and SVC;

[0049] S3: Calculate the limit reactive power adjustable amount of each reactive power compensation device based on various adjustable states;

[0050] S4: Distribution of adjustable reactive power in the wind farm, calculating emergency adjustable reactive power of wind turbines and SVC equipment;

[0051] S5: After ensuring that the voltage returns t...

Embodiment 2

[0102] figure 2 It is a schematic diagram of the structure of a single wind farm connected to a 220kV regional grid. Among them, the wind farm can be equivalent to three double-fed wind turbines (DFIG) with the same parameters, denoted by G1, G2, and G3 respectively. The installed capacity is 66MW, 50MW, and 132MW respectively. The / 35kV box-type transformer is boosted and connected to the collector line, and SVC equipment is centrally configured on the side of the 35kV step-up bus of the wind farm, and the compensation capacity is about 40% of the total installed capacity of the wind farm. The gathering point of the wind farm group is boosted by a 35 / 220kV step-up transformer and then connected to the external network through a 220kV overhead transmission line.

[0103] It is set that a unipolar blocking fault occurs in the DC system near the wind farm at 0.5s. On the premise that SVC does not participate in reactive power compensation and DFIG does not participate in reac...

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Abstract

The invention discloses a DFIG and SVC reactive emergency coordination control method in a wind power plant. The method comprises steps of setting a reference voltage threshold value of DFIG participating in reactive power support and a reference voltage threshold value of SVC switching operation; based on a grid-connected point voltage, a DFIG terminal voltage and the Crowbar protection action information, adjusting operation states of a wind turbine generator and the SVC; calculating the limit reactive adjustable quantity of each reactive compensation device based on multiple adjustable states; performing reactive power adjustable quantity distribution in the wind power plant, and calculating emergency reactive power adjustable quantities of a wind turbine generator and SVC equipment; and after that the voltage is recovered to a normal control range is ensured, performing a conventional reactive power allocation scheme of the wind turbine generator and the SVC equipment. The DFIG andSVC reactive emergency coordination control method in a wind power plant is advantaged in that on the premise that a multi-direct-current weak sending end system has an alternating-current and direct-current cascading fault, based on the basic principle of near-region wind power plant reactive power source coordination control, the dynamic reactive response characteristics of DFIG, SVC and otherdevices in the wind power plant are fully utilized, and a problem that large-scale off-grid of a draught fan is caused by large-amplitude fluctuation of a grid-connected point voltage of a wind powerplant in the fault period is further solved.

Description

technical field [0001] The invention belongs to the field of voltage stability and reactive power emergency control after large-scale wind power is connected to the grid, and in particular relates to a reactive power emergency coordinated control method of DFIG and SVC in a wind farm. Background technique [0002] With the rapid increase of the proportion of new energy in the AC-DC hybrid power system, the impact of large fluctuations in the voltage of the grid-connected points of nearby wind farms after a fault on the stable operation of new energy units cannot be ignored. [0003] At present, in view of the large-scale fluctuation of the grid-connected point voltage after the AC-DC cascading failure, the large-scale off-grid of the fan is caused. Domestic and foreign scholars have done a lot of research on the emergency switching control of new energy units, conventional power units or loads. The main considerations are: "Priority cut off the new energy units, and then cut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/18H02J3/50
CPCH02J3/1864H02J3/24H02J3/50Y02E10/76Y02E40/10
Inventor 李潇刘文颖王维洲王方雨张振宇夏鹏牛栓保张雨薇张尧翔朱丽萍柯贤波张雯程许春蕾胡阳陈鑫鑫郇悦刘紫东曾贇杨美颖
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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