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Method for suppressing voltage fluctuation and flicker caused by wind power

A technology of voltage fluctuation and flicker, applied in the direction of electronic commutation motor control, motor generator control, control of electromechanical brakes, etc., can solve the problems of high cost and increase of short circuit capacity at large grid connection points.

Inactive Publication Date: 2014-05-07
北京科诺伟业科技股份有限公司 +1
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Problems solved by technology

These two points are the solutions proposed for the grid environment where the wind turbines will be merged into. The grid needs to be improved, the line reactance and resistance ratio should be selected, and the short-circuit capacity at the large grid-connected point should be increased. The cost is relatively high.

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  • Method for suppressing voltage fluctuation and flicker caused by wind power
  • Method for suppressing voltage fluctuation and flicker caused by wind power
  • Method for suppressing voltage fluctuation and flicker caused by wind power

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0016] figure 1 It is a schematic diagram of the voltage fluctuation and flicker suppression method caused by wind power of the present invention.

[0017] Such as figure 1 As shown, the wind turbine direct torque control system 101 realizes the direct control of flux linkage and torque by detecting the stator voltage and current of the wind turbine. In the existing wind turbine direct torque control system 101, the excitation power supply u on the rotor side is independently adjusted r The amplitude and phase of the rotor can change the rotor current, and then control the electromagnetic torque of the direct torque control system of the wind turbine.

[0018] It should be noted that the algebraic expression of the fifth-order model of the doubly-fed wind turbine involved in the existing wind turbine direct torque control system is:

[0019...

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Abstract

The invention discloses a method for suppressing voltage fluctuation and flicker caused by wind power. According to the method, the active disturbance rejection control technology is introduced into torque control of a wind generator, a torque sharp-wave signal is grouped into unknown disturbance, and rotor current fluctuation is suppressed through nonlinear state error feedback in the case of unknown disturbance so as to keep output torque stable and suppress fluctuation and flicker of voltage of the wind generator. The method overcomes the limitation of voltage fluctuation and flicker governance by a power grid, and fluctuation and flicker of output voltage of a wind turbine are suppressed before wind power is grid-connected, which is conducive to improvement of the dynamic performance of the wind turbine and the quality of power supply.

Description

technical field [0001] The invention relates to a wind power generation control method, in particular to a voltage fluctuation and flicker suppression method caused by wind power. Background technique [0002] Voltage fluctuation and flicker are an important technical index of power quality. When there is a load with impact power in the power system (such as rolling mill, electric arc furnace), the voltage drop in the power grid will change accordingly, resulting in voltage fluctuations. The voltage fluctuation value with a frequency in the range of 5-12Hz, even if it is only 1% of the rated voltage, the flicker of incandescent lighting caused by it is enough to make people feel uncomfortable, so the working condition of the incandescent lamp is selected as the judgment voltage fluctuation. The value, the subjective feeling of the light flicker caused by the voltage change is called "flicker". [0003] The usual suppression measures for voltage fluctuation and flicker incl...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P9/00H02P21/13H02P21/14
Inventor 李斌冯成张雷李海东
Owner 北京科诺伟业科技股份有限公司
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