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: 2012-12-12
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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[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 the Decoupled Double Synchronous Reference Frame Soft Phase-locked Loop (DDSRF-SPLL).
[0052] The basic principle of DDSRF-SPLL see figure 2 As shown, the figure is the schematic diagram of DDSRF-SPLL.
[0053] DDSRF includes two rotating coordinate systems, of which the positive sequence dq +1 The synchronous rotating coordinate system rotates counterclockwise at an angular velocity of ω, and its angle is set as Negative sequence dq -1 The synchronous rotating coordinate system is rotated clockwise at an angular velocity of -ω, and its angle is set as ω is the angular velocity calculated by SPLL. u a , U b , U c It is the three-phase voltage of the grid detected by the voltage sensor. abc / dqm represents the three-phase static coordinate system to the positive sequence dq +1 Transformation of synchronous rotating coordin...
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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 method and system for coordinated control of low voltage ride-through of a full-power wind turbine converter. Background technique [0002] With the continuous expansion of the scale of wind power generation, the impact of wind power generation systems on the 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 and reactive power, so the power generation efficiency is high and the structure It is relatively simple and has good operational stability. See figure 1 , The picture is the current typical full-power wind power generation system structure diagram. [0003] The power generation system uses a full-power dual PWM converter (including the g...
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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