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Controller of exciting power-supply net sided converter for double-feedback speed-variable frequency-constant wind-driven generator

A grid-side converter and wind turbine technology, which is applied in the control of wind turbines, motor generators, wind turbines, etc., can solve problems such as large common-mode voltage, large input current harmonics, and DC voltage fluctuations, and achieve The effects of eliminating common mode voltage and differential mode voltage, reducing grid side current harmonics, and eliminating influence

Inactive Publication Date: 2007-06-20
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0019] The present invention aims at the technical deficiencies of large input current harmonics, DC voltage fluctuations, output differential mode voltage, and common mode voltage of the existing excitation power grid side when the grid is unbalanced, and proposes a controller for a grid side converter. The present invention It can effectively suppress the impact of unbalanced power grid on the performance of excitation power supply

Method used

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  • Controller of exciting power-supply net sided converter for double-feedback speed-variable frequency-constant wind-driven generator
  • Controller of exciting power-supply net sided converter for double-feedback speed-variable frequency-constant wind-driven generator
  • Controller of exciting power-supply net sided converter for double-feedback speed-variable frequency-constant wind-driven generator

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Embodiment Construction

[0038] As shown in FIG. 3 , the hardware circuit of the present invention includes a current transformer 1 , a voltage transformer 2 , a voltage and current processing unit 3 , a DSP processing unit 4 , an IPM drive protection unit 5 , an L filter inductor 7 , and a bridge rectifier circuit 6 . The grid is connected to the rectifier circuit 6 through a filter inductor 7 . The voltage transformer 1 measures the voltage of the three-phase grid, the current transformer 2 measures the three-phase current, and the measured voltage and current digital quantities are input to the voltage and current processing unit 3 . The voltage and current are filtered and AD converted in the voltage and current processing unit 3 to obtain digital signals of the voltage and current, which are input to the DSP processing unit 4 . The DSP processing unit 4 performs control calculations, outputs PWM signals, and inputs them to the driving protection unit 5 , and the driving protection unit 5 finally ...

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Abstract

The invention is concerned with a controller of side converter to excitation electrical source web of double fed variable speed constant frequency wind generator. It controls current by a deadbeat control based on predicted current control, turns the current command signal of dq coordinate to two-phase immobile coordinate to get positive and negative order current present value of alpha and beta axes. Get present value of current to two-phase immobile coordinate through addition operation and carry immobile coordinate commutation about current of power system to get alpha and beta component of actual current value. Make the difference of command and present value, and get inductance pressure drop according to change ratio of current to count the input voltage, and get impulse signal to control on-off tube through SVPWM (space voltage vector). It keeps the control precision of DC voltage, eliminates influence to rotor side converter of fluctuation to DC side voltage, restrains common-mode voltage and differential-mode voltage output by rotor side converter to reduce burden of processor under lopsided state of power system.

Description

technical field [0001] The invention relates to an excitation power supply of a doubly-fed variable-speed constant-frequency wind power generator, in particular to a controller for a converter of the excitation power grid side of a variable-speed constant-frequency wind power generator. Background technique [0002] At present, there are four main wind power technologies in the world: fixed pitch regulation wind power technology, variable pitch regulation technology, active fixed pitch regulation technology, and variable speed constant frequency wind power generation technology. Among these four adjustment methods, theoretically speaking, the variable-speed constant-frequency wind power generation technology is the most optimized technology, and it has the following advantages: [0003] 1. Maximize the capture of wind energy. [0004] 2. Wide speed operating range, suitable for wind turbine speed changes caused by wind speed changes. [0005] 3. The use of advanced PWM con...

Claims

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Application Information

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IPC IPC(8): H02M7/12F03D7/00H02P21/00H02P21/24
CPCY02E10/76Y02E10/723Y02E10/72
Inventor 林资旭李亚西赵斌许洪华武鑫赵栋利潘磊郭金东付旺保
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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