Stator series impedance-based double-fed wind generation set high/low voltage ride through system and method

A technology of high and low voltage ride-through and doubly-fed wind turbines, applied in wind power generation, AC network voltage adjustment, electrical components, etc., can solve problems such as complex control and maintenance, high price of auxiliary circuits, etc., to ensure availability, ensure safety, shorten Effect of winding life

Active Publication Date: 2019-04-12
SHANGHAI JIAO TONG UNIV +1
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Problems solved by technology

[0011] The above patents use additional energy storage modules, 3 sets of inverter bridges, and three-phase transformers to realize low-v

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  • Stator series impedance-based double-fed wind generation set high/low voltage ride through system and method
  • Stator series impedance-based double-fed wind generation set high/low voltage ride through system and method
  • Stator series impedance-based double-fed wind generation set high/low voltage ride through system and method

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Embodiment Construction

[0044] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0045] Such as Figure 1 to Figure 8 As shown, a doubly-fed wind turbine high and low voltage ride-through system based on stator series impedance provided by the present invention includes a DFIG stator circuit connected to the power grid, and the DFIG stator circuit includes a filter inductor connected in sequence, a network measurement converter, The rotor-side converter and the double-fed wind generator, a series impedance protection circuit is connected in series between the double-fed wind generat...

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Abstract

The invention provides a stator series impedance-based double-fed wind generation set high/low voltage ride through system and method. The system comprises a DFIG stator loop connected with a power grid, wherein the DFIG stator loop comprises a filter inductor, a network side converter, a rotor side converter and a double-fed wind generation set, which are connected in sequence; a serial impedanceprotection circuit is arranged between the double-fed wind generation set and the filter inductor; the serial impedance protection circuit comprises a rapid switch and an impedance branch, which areconnected in parallel; the impedance branch comprises an impedance inductor and an impedance resistor, which are connected in series. According to the system and method, power grid comprehensive faultride through comprising high/low-voltage faults of DFIG is solved, complete compensation of DFIG stator voltage during faults is realized, the DFIG is enabled to satisfy rated working conditions, andtotal-power stator reactive support problem caused to power grids by DFIG during high/low-voltage faults is solved.

Description

technical field [0001] The invention relates to the field of operation of a doubly-fed wind power generation system under a faulty power grid, in particular to a high-low voltage ride-through method for a doubly-fed wind turbine based on stator series impedance. Background technique [0002] As the mainstream type of wind power generation, the doubly-fed induction wind turbine (DFIG) occupies a large proportion of the current installed wind power capacity due to its advantages of variable speed and constant frequency operation, small required converter capacity, and low cost. [0003] With the widespread manufacture and use of DFIG units equipped with crowbar circuits, most DFIGs have preliminarily met the requirements for non-off-grid operation under low-voltage faults in the power grid. When the power grid encounters a low-voltage fault, the crowbar circuit needs to be put into operation in time, and the rotor of the doubly-fed fan is short-circuited. From the perspective...

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Application Information

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IPC IPC(8): H02J3/38H02J3/16
CPCH02J3/386H02J3/16Y02E10/76Y02E40/30
Inventor 蔡旭叶迪卓然邵昊舒饶芳权
Owner SHANGHAI JIAO TONG UNIV
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