Doubly-fed wind power generation system, doubly-fed converter and machine-side shutdown control method of doubly-fed converter
A technology of doubly-fed converters and wind turbines, applied in the direction of generator control circuits, wind power generation, control generators, etc., can solve problems such as unsafe opening of stator contactors, and achieve the effect of avoiding arc adhesion
Pending Publication Date: 2021-05-28
SUNGROW POWER SUPPLY CO LTD
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Problems solved by technology
However, in the machine-side shutdown logic of the current doubly-fed converter, it is prone to unsafe opening of the stator contactor under high current, and this problem has yet to be resolved
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[0048] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0049] In this application, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes none. other elements specifically listed, or also include elements inherent in such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "com...
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The invention provides a doubly-fed wind power generation system, a doubly-fed converter and a machine side shutdown control method thereof. The method comprises the steps that after a doubly-fed converter is in a normal grid-connected operation state and receives a shutdown instruction, the power instruction of the doubly-fed converter is controlled to be zero, and then whether the stator current of the doubly-fed converter is smaller than or equal to preset safety current or not is judged; if the stator current is smaller than or equal to the preset safety current, a stator contactor is controlled to be opened; and after the stator contactor is successfully opened, a machine-side converter is controlled to seal waves and shut down. According to the invention, even if the control of the machine-side converter is abnormal, although the given power instruction is zero, the stator may have large current, the stator contactor is not forcibly disconnected in the state, the stator current is firstly judged, and only when the stator current is less than or equal to the preset safety current, the stator contactor of the doubly-fed converter is controlled to be switched off, so that the arc discharge and adhesion of the stator contactor caused by the unsafe opening of the large current can be avoided.
Description
technical field [0001] The invention relates to the technical field of wind power generation, in particular to a doubly-fed wind power generation system, a doubly-fed converter and a machine-side shutdown control method thereof. Background technique [0002] As a clean, abundant and renewable energy, wind power has been increasingly valued by all walks of life, especially in recent years, it has developed rapidly. At present, the doubly-fed wind power system is widely used due to its cost advantages such as converters and motors. In large-scale wind farms, doubly-fed wind power generation technology has become one of the most widely used wind power generation technologies. [0003] With the advancement of technology, the capacity of the complete unit continues to increase, and the current protection value of the doubly-fed converter involved is also increasing; therefore, if the unit continues to rely on overvoltage and overcurrent protection under serious faults, there may ...
Claims
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IPC IPC(8): H02J3/38H02P9/00H02P101/15
CPCH02J3/381H02P9/007H02J2300/28H02P2101/15Y02E10/76
Inventor 杨辉杨春源孟祥志汪令祥
Owner SUNGROW POWER SUPPLY CO LTD