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Intelligent power control unit for low voltage ride through and application thereof

A low-voltage ride-through, control unit technology, applied in electrical components, reducing/preventing power oscillation, output power conversion devices, etc. Effect

Inactive Publication Date: 2011-05-11
NANJING HIGH DRIVE ELECTROMECHANICAL AUTOMATION EQUIP CO LTD
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Problems solved by technology

[0009] The purpose of the present invention is to solve the practical problem of poor low-voltage ride-through capability generally existing in the grid-connected operation of wind power generators, especially the poor low-voltage ride-through capability of constant-speed constant-frequency asynchronous generator sets or variable-speed constant-frequency double-fed generator sets, Provide a low voltage ride through intelligent power control unit and its application

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  • Intelligent power control unit for low voltage ride through and application thereof
  • Intelligent power control unit for low voltage ride through and application thereof
  • Intelligent power control unit for low voltage ride through and application thereof

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Embodiment Construction

[0036] The accompanying drawings disclose the specific structures of the embodiments of the present invention and several applications thereof without limitation, and the present invention will be further described below in conjunction with the accompanying drawings.

[0037] Depend on figure 1 It can be seen that the IPCU is equipped with A port, B port and C port, and the control unit is also equipped with a built-in auxiliary frequency converter AI for stabilizing the stator voltage and providing reactive power and a controllable active load for absorbing active power; the A port A high-speed switch GK is set between the B port and the A port and the C port is set with a built-in auxiliary frequency converter AI, wherein the AC bus of the built-in auxiliary frequency converter AI is connected to the A port, and the DC The side is connected with the C port;

[0038] In this embodiment, the controllable active load is connected to the DC output terminal of the built-in auxil...

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Abstract

The invention relates to an intelligent power control unit (IPCU) for low voltage ride through, which comprises a port A, a port B, a port C, a built-in auxiliary frequency converter for stabilizing stator voltage at the moment of ride through and for providing reactive power, and a controllable active load for absorbing active power; a high speed switch is arranged between the port A and the port B; the built-in auxiliary frequency converter is arranged between the port A and the port C; and the built-in auxiliary frequency converter and the controllable active load are sequentially connected between the port A and the port C in series or connected with the controllable active load from the port A through a three-phase bridge-type rectifier, so that the branch circuit of the built-in auxiliary frequency converter is connected with that of the controllable active load in parallel. When the IPCU is used, the port A is connected with the stator winding of a wind generating set, the port B is connected with the power network, and the port C is connected with the DC bus of an external auxiliary frequency converter.

Description

technical field [0001] The invention relates to a low-voltage ride-through intelligent power control unit and its application, in particular to a low-voltage ride-through intelligent power control unit designed for various types of wind power generators without the low-voltage ride-through function. That is to say, it is suitable for transforming the existing asynchronous wind power generator, and it is also suitable for improving the doubly-fed wind power generator with frequency converter. 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 w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/24H02J2300/28H02J3/381Y02E10/76H01L29/66333H02J3/36H02M5/4585Y02B70/30
Inventor 王中廖恩荣李更生李志国黄晓辉辛志远
Owner NANJING HIGH DRIVE ELECTROMECHANICAL AUTOMATION EQUIP CO LTD
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