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

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: 2014-10-01
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 novel doubly-fed wind turbine with perfect low-voltage ride-through capability in order to solve the problems of large impact torque and poor reliability during low-voltage ride-through of the current traditional double-fed converter when the grid voltage drops. Doubly-fed converter and its control method, applicable to various doubly-fed generating sets

Method used

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

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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 novel doubly-fed converter with perfect and reliable low-voltage ride-through capability. The doubly-fed converter is rapidly switched by a fast grid-connected switch GK, a DC unloading unit DBU, a stator Crowbar, and an auxiliary power supply Unit APS, grid-side power module GSC, rotor-side power module RSC, grid-connected circuit breaker K1 and controller KZQ, etc. This doubly-fed converter is provided with A port, B port, C port and D port, where A port is connected to the doubly-fed wind turbine stator, B port is connected to the grid, C port is connected to the doubly-fed generator rotor, and D The port is connected to the power supply of the main control system of the doubly-fed generator set; the AC end of the stator crowbar is connected to the stator of the doubly-fed generator, and the DC unloading unit is connected to the common DC bus of GSC and RSC; the work of each part of the doubly-fed converter The state is controlled by the signal sent 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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Patent Type & Authority Patents(China)
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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