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Method and system for cooperatively controlling low voltage ride through of full-power fan converter

A low-voltage ride-through and cooperative control technology, applied in power transmission AC network, single-network parallel feeding arrangement, etc., can solve problems such as energy mismatch, and achieve the effect of reducing mechanical stress

Active Publication Date: 2011-06-08
SUNGROW POWER SUPPLY CO LTD
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Problems solved by technology

[0013] The technical problem to be solved by the present invention is to provide a cooperative control method and system for low-voltage ride-through of full-power wind turbine converters, which can solve the power grid problem without changing the converter components and the electromagnetic torque of the generator. Energy mismatch problem caused by voltage drop

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  • Method and system for cooperatively controlling low voltage ride through of full-power fan converter

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Embodiment Construction

[0051] In order for those skilled in the art to better understand and implement the technical solution of the present invention, the following first introduces a double synchronous coordinate system software phase-locked loop (DDSRF-SPLL, Decoupled Double Synchronous Reference Frame Soft Phase-locked Loop).

[0052] The basic principle of DDSRF-SPLL see figure 2 As shown, this figure is the schematic diagram of DDSRF-SPLL.

[0053] DDSRF includes two rotating coordinate systems, where the positive order dq +1 The synchronous rotating coordinate system rotates counterclockwise at ω angular velocity, and its angle is set to while the negative sequence dq -1 The synchronous rotating coordinate system rotates clockwise at an angular velocity of -ω, and its angle is set to ω is the angular velocity calculated by SPLL. u a , u b , u c It is the three-phase voltage of the power grid detected by the voltage sensor. abc / dqm means three-phase static coordinate system to posit...

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Abstract

The invention provides a method and system for cooperatively controlling a low voltage ride through of a full-power fan converter. The method comprises the following steps of: judging dropping and resilient stability of a voltage of a power grid; when the voltage of the power grid is in a dropping transient state or a rising transient state, carrying out temporary forced locking on a driving signal of a power switching tube device of a network side converter; and when the voltage of the power grid is in a dropping stable state or is recovered to the normal stable state, relieving locking of the driving signal of the power switching tube device of the network side converter. Meanwhile, the method and the system are matched with work of a crowbar circuit so as to realize the low voltage ride through of the network side converter. In the invention, different states of the voltage of the power grid are judged by a positive sequence component and a negative sequence component of the voltage of the power grid so as to carry out different controls. Moreover, only the network side converter is controlled and a machine side converter can always normally operate, so that the mechanical stress of a wind machine and a driving chain, which is caused by electromagnetic torque pulsation of a generator, is reduced.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a cooperative control method and system for low-voltage ride-through of full-power wind turbine converters. Background technique [0002] With the continuous expansion of the scale of wind power generation, the influence of wind power generation system on the power grid has become more and more significant. In a full-power wind power system, the stator winding of the generator is connected to the grid through a full-power converter, which has good adaptability to grid fluctuations and can realize independent control of grid-connected active power and reactive power, so the power generation efficiency is high and the structure Relatively simple, good running stability. see figure 1 , which is a structural diagram of a typical full-power wind power generation system at present. [0003] The power generation system uses full-power dual PWM converters (including the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/36
CPCY02E60/60
Inventor 曹仁贤王成悦汪令祥杨春源屠运武
Owner SUNGROW POWER SUPPLY CO LTD
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