DVR (Dynamic Voltage Restorers)-based low-voltage ride through support device of wind generating set

A technology for wind turbines and low-voltage ride-through, applied in wind power generation, reactive power compensation, reactive power adjustment/elimination/compensation, etc., can solve problems that have not been reported and applied, and achieve improved service life and low cost , high reliability effect

Inactive Publication Date: 2012-05-09
NANJING JUNENG ELECTRICAL CONTROL AUTOMATION EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] At present, the traditional dynamic voltage restorer DVR is added to other functional modules to be use

Method used

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  • DVR (Dynamic Voltage Restorers)-based low-voltage ride through support device of wind generating set
  • DVR (Dynamic Voltage Restorers)-based low-voltage ride through support device of wind generating set
  • DVR (Dynamic Voltage Restorers)-based low-voltage ride through support device of wind generating set

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0042] by figure 1 It can be seen that there are three-phase independent H-bridge inverter units between the A port and the B port of the dynamic voltage restorer DVR, and each independent H-bridge inverter unit is equipped with a filter and an H-bridge inverter. Each phase filter LB A , LB B , LB C The input side is respectively arranged in series between the A port and B port of the DVR, one end is connected to the corresponding output end of the wind turbine, and the other end is connected to the corresponding power grid by the B port of the DVR, and enters the corresponding phases after filtering. H-bridge inverter UI A , UI B And UI C AC input side. Three H-bridge inverter UI A , UI B And UI C The output side of the DVR is connected in parallel to form the C port of the DVR, and a DC capacitor C is provided in the C port 1 . The dynamic voltage restorer DVR of this structure can realize synchronous compensation for the voltage at the output terminal of the wind turbine gen...

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Abstract

The invention relates to a DVR (Dynamic Voltage Restorers)-based low-voltage ride through support device of a wind generating set, consisting of a DVR, an active power release circuit, a network-side reactive current injection inverter and a controller, wherein the DVR is provided with a port A, a port B and a port C, wherein the port A is connected with the output end of the wind generating set, the port B is connected with a grid, a filter input side of the DVR is connected to a main loop in a serial connection mode, an output side of an H bridge inverter is the port C, and a direct-current capacitor is arranged in the port C; the reactive current injection inverter is provided with a port AC and a port DC, wherein the port AC is connected with the port B of the DVR, and a direct-current bus capacitor is arranged at the port DC; a stator Crowbar is provided with a port AC and a port DC, wherein the port AC is connected with the port A of the DVR, and the direct-current bus capacitor is arranged at the port DC; and a working state of the DVR is controlled by a triggering signal sent by the controller.

Description

technical field [0001] The invention relates to a low-voltage ride-through supporting device of a wind power generating set capable of realizing low-voltage ride-through, which is realized based on a series dynamic voltage restorer DVR. Background technique [0002] With the rapid development of wind power generation, the installed capacity of wind power is constantly increasing, and the proportion of wind power in the power generation capacity is also increasing. When the proportion of wind power installed capacity in the power system is relatively large, after a power system fault causes a voltage drop, the removal of the wind farm will seriously affect the stability of the system operation. Studies have shown that when wind turbines have low voltage ride through (Low Voltage Ride Through, LVRT) capabilities, the stability of the entire power system can be improved. Therefore, countries with a large proportion of wind power installed capacity in the world, such as Denmark...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/18
CPCY02E10/763Y02E40/30Y02E10/76
Inventor 黄晓辉廖恩荣李更生王中李志国辛志远
Owner NANJING JUNENG ELECTRICAL CONTROL AUTOMATION EQUIP
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