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Method and device for actively protecting double-fed wind power generator converter

A technology for wind power generators and doubly-fed converters, applied in emergency protection circuit devices for limiting overcurrent/overvoltage, emergency protection circuit devices, circuit devices, etc., to achieve simple design, reduced device cost, and improved reliability sexual effect

Inactive Publication Date: 2011-11-23
CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the crowbar protection device on the rotor side introduced in this paper still needs a control device for control, so there are still defects in the aforementioned problems

Method used

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  • Method and device for actively protecting double-fed wind power generator converter
  • Method and device for actively protecting double-fed wind power generator converter
  • Method and device for actively protecting double-fed wind power generator converter

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Embodiment 1

[0037] Such as Figure 1~2 As shown, an active crowbar protection device for double-fed wind turbine converter, including: diode 7, relay 4, double-fed converter 2, high-power resistor R1, filter resistor R, filter capacitor C; Crowbar protection device 1 The output terminal is connected to the three phases A, B, and C on the rotor side of the double-fed converter 2, and the relay 4 is connected to the double-fed converter 2, and the double-fed converter 2 can control its on-off; among them, the pull-in coil of the relay 5 is the pull-in coil of relay 4, and K is the relay switch. According to the general relay principle, when the current in the pull-in coil is greater than the critical value, the coil pulls in and the switch is closed; when the current in the pull-in coil is less than the critical value, The coil is released and the switch opens. But in this invention, as shown in Table 1, the relay pull-in coil 5 is connected with the doubly-fed converter 2, and the relay p...

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Abstract

The invention discloses a method and a device for actively protecting a double-fed wind power generator converter. A crowbar protection device accesses a rotor side of the converter, provides bypass for a rotor side circuit, limits a current which passes through a double-fed converter and keeps a generator from operating out of network by using a low-voltage ride-through control strategy. When a system is stabilized, the crowbar protection device is cut off, and a double-fed wind power generator normally operates. The invention is characterized in that: an output end of the crowbar protection device is connected with an A phase, a B phase and a C phase of the rotor side of the double-fed converter; a relay and the converter are connected as shown by figure 2; coils Q of the relay are connected in series to a main circuit of a crowbar; and a switch of the relay is connected in series with R1, so the converter can control the switch-on and switch-off of the relay, the switch-on or switch-off of the relay is determined by the size of the current which passes through operating coils of the relay, and the crowbar protection device is controlled to be triggered or not.

Description

technical field [0001] The present invention relates to a protection method and device for a wind power generator, specifically an active Crowbar (sudden short circuit protection device) protection method and device for a doubly-fed wind power generator converter, which is mainly used in the control of a doubly-fed wind power generator system. Background technique [0002] On the generator rotor side of the doubly-fed wind turbine converter, a Crowbar protection device is generally installed to prevent damage to the converter due to excessive rotor current when the power grid fails. [0003] The traditional crowbar protection strategy of the double-fed wind turbine converter is: when the power grid fails, the rotor current is too large. After detecting that the rotor current is too large, the main control system issues an instruction to start the crowbar protection circuit to protect the converter. . Because this protection strategy needs to be equipped with a dedicated co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02
Inventor 罗成胡佑群张东辉李远琼王宝归
Owner CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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