Method for suppressing total output reactive power fluctuation by adopting doubly-fed induction wind power system with series grid-side converter under unbalanced voltage

A series grid-side, double-fed induction technology, applied in reactive power adjustment/elimination/compensation, reactive power compensation, wind power generation, etc., can solve problems such as total output reactive power control of the system

Inactive Publication Date: 2012-04-25
CHONGQING UNIV
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Problems solved by technology

However, this literature is mainly aimed at the control scheme of the DFIG system using SGSC to suppress the double frequency fluctuation of the total output active power, and has not yet proposed a feasible scheme for the total output reactive power control of the system under the unbalanced grid voltage

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  • Method for suppressing total output reactive power fluctuation by adopting doubly-fed induction wind power system with series grid-side converter under unbalanced voltage
  • Method for suppressing total output reactive power fluctuation by adopting doubly-fed induction wind power system with series grid-side converter under unbalanced voltage
  • Method for suppressing total output reactive power fluctuation by adopting doubly-fed induction wind power system with series grid-side converter under unbalanced voltage

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Embodiment Construction

[0082] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0083] Such as figure 1 As shown, the present invention uses a method for suppressing fluctuations in total output reactive power of a doubly-fed induction wind power system using series grid-side converters under unbalanced voltages. It includes control objects: DC link capacitor 1, motor-side converter 2 , parallel network side converter 3, space vector pulse width modulation module 4, double-fed induction wind turbine 5, series grid side converter 6, step-up transformer 7, current Hall sensor 8, voltage Hall sensor 9, and network Side converter current command given value calculation module 10, positive sequence voltage control module 11, negative sequence voltage control module 12, notch filter 13, constant power transformation from forward synchronous angular velocity rotating coordinate system to stationary two-phase αβ coordinate axis s...

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Abstract

The invention discloses a method for suppressing total output reactive power fluctuation by adopting a doubly-fed induction wind power system with series grid-side converters under unbalanced voltage. The method relates to the control of series and parallel grid-side converters and motor-side converters. Pulse-width modulation (PWM) driving signals of the series and parallel grid-side converters are generated through a specific method to control the series and parallel grid-side converters. Under unbalanced grid voltage, a doubly-fed induction generator (DFIG) with the series grid-side converters does not change the control strategies of a rotor-side converter. On the premise that the doubled frequency fluctuation of the output power of the generator does not occur, the doubled frequency fluctuation of the electromagnetic torque does not occur and the three-phase current of a stator and a rotor are in balance, through the coordination control of the series grid-side converters and theparallel grid-side converters, the goal that the doubled frequency fluctuation of the total output reactive power of the entire system does not occur is realized, and the quality of reactive power provided by the DFIG wind power system to the grid under unbalanced grid voltage is improved.

Description

technical field [0001] The present invention relates to the technical improvement of the doubly-fed induction wind power generation system using series grid-side converters, in particular to a control method for suppressing fluctuations in total output reactive power of the doubly-fed induction wind power generation system using series grid-side converters under unbalanced voltage, It belongs to the technical field of power control. Background technique [0002] The stator of a doubly fed induction generator (DFIG) is directly connected to the power grid. If appropriate control measures are not taken, a small stator voltage imbalance will cause a large imbalance in the stator and rotor currents, resulting in power generation The electromagnetic torque and grid-connected power of the motor fluctuate greatly, and the long-term asymmetric operation of the stator and rotor windings of the motor will also cause problems such as unbalanced heating and winding insulation. The root...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18
CPCY02E10/763Y02E40/30Y02E10/76
Inventor 姚骏廖勇夏先锋李清
Owner CHONGQING UNIV
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