Doubly-fed converter with reliable low-voltage ride-through capacity

A low-voltage ride-through, double-fed converter technology, applied in the direction of single-grid parallel feeding arrangement, etc., can solve the problems of large impact torque and poor reliability, and achieve the effect of improving service life

Inactive Publication Date: 2012-11-21
NANJING HIGH DRIVE ELECTROMECHANICAL AUTOMATION EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a solution for the problems of large impact torque and poor reliability when the current traditional doubly-fed converter performs low-voltage ride-through when

Method used

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  • Doubly-fed converter with reliable low-voltage ride-through capacity
  • Doubly-fed converter with reliable low-voltage ride-through capacity
  • Doubly-fed converter with reliable low-voltage ride-through capacity

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Embodiment Construction

[0035] The accompanying drawings disclose the specific structures of the embodiments of the present invention without limitation, and the present invention will be further described below in conjunction with the accompanying drawings.

[0036] by figure 2 As an example, the specific implementation of this new doubly-fed converter will be described.

[0037] figure 2 The fast grid-connected switch GK, the stator side Crowbar, the auxiliary power supply fast switching unit APS, etc. are added to the common traditional double-fed converter. The control strategy of the normal power grid is the same as that of the ordinary double-fed converter. The difference is that the control strategy when the power grid fails is somewhat different from the existing converter, and its algorithm is simple and reliable.

[0038] The entire working process of the present invention is as follows: when the power grid is working normally, the stator side Crowbar SC is disabled before grid connecti...

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Abstract

The invention relates to a doubly-fed converter with a reliable low-voltage ride-through capacity, and the doubly-fed converter consists of a rapid synchronization switch GK, a direct-current unload unit DBU, a stator Crowbar, an auxiliary power supply rapid switching unit APS, a network-side power module GSC, a rotor-side power module RSC, a synchronization circuit breaker K1, a controller KZQ and the like. The doubly-fed converter is provided with a port A, a port B, a port C and a port D, wherein the port A is connected with a stator of a doubly-fed wind power generator, the port B is connected with an electric network, the port C is connected with a rotor of a doubly-fed generator, and the port D is connected with a main control system power supply of a doubly-fed power generating unit; a terminal AC of the stator Crowbar is connected with a stator of the doubly-fed generator, and the direct-current unload unit is connected with a common direct-current bus of the GSC and the RSC; and the working status of each part of the doubly-fed converter is respectively controlled by a signal transmitted by the controller KZQ.

Description

technical field [0001] The invention designs a device and a control method for a converter of a doubly-fed wind power generating set with a perfect low voltage ride-through function, and is suitable for a doubly-fed wind power generating set. 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 D...

Claims

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Application Information

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IPC IPC(8): H02J3/38
Inventor 王中廖恩荣黄晓辉李志国辛志远
Owner NANJING HIGH DRIVE ELECTROMECHANICAL AUTOMATION EQUIP CO LTD
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