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Control method of reactive power of doubly fed wind power generator

A doubly-fed wind power generation, wind power generator technology, applied in the direction of motor generator control, electronic commutation motor control, wind power generation, etc.

Inactive Publication Date: 2013-09-18
CHINA AGRI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the existing doubly-fed wind-driven generator reactive power control method, and provide a doubly-fed wind-driven generator reactive power control method that does not require complex transformations and calculations such as vector rotation changes

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  • Control method of reactive power of doubly fed wind power generator

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Embodiment Construction

[0040] The present invention will be further described in detail below in conjunction with specific embodiments.

[0041] The basic hardware topology of a doubly-fed wind turbine is as follows: figure 1 As shown, the grid supplies power to the rotor of the doubly-fed wind turbine through the converter, and the generator is driven by the wind turbine, and its stator outputs active and reactive power to the grid. There are many known methods for measuring generator parameters, and the most commonly used method is to use no-load and locked-rotor tests to measure motor parameters. Using the method in Document 1, the parameters of the generator can also be obtained, such as the stator resistance R s , stator winding inductance Ls, stator and rotor winding mutual inductance L M and other parameters.

[0042] Document 1: "Estimation and Measurement of Asynchronous Motor Parameters in Vector Control System", Ma Xiaoliang, Electric Drive, Volume 40, Issue 7, 2010.

[0043] The gene...

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Abstract

The invention relates to a control method of reactive power of a doubly fed wind power generator. The doubly fed wind power generator comprises a doubly fed motor, wherein the motor comprises a stator and a driving rotor, and the stator supplies power to a grid; the grid has rated voltage, and the driving rotor is coupled with the stator; one end of the rotor is connected to a wind turbine through a transmission gear, and a rotor winding is a three-phase wound rotor winding; and the grid supplies power to the rotor through a converter, and stator voltage and stator flux are decomposed onto a synchronously rotary dq coordinate axis to control the reactive power output by the generator stator by adjusting the current of the rotor. In the method, no complex transformation and calculation of vector rotation change and the like are needed, the control sensitivity of a current control module is lower, the circuit parameters and the measurement delay of a converter system have smaller impact on current control, and the control technology is simple, and thereby the cost of a controller is also reduced. The control method is suitable for application of a low-power wind power generator.

Description

technical field [0001] The invention relates to a wind power generator, in particular to a control method for reactive power of a doubly-fed wind power generator connected to a grid. Background technique [0002] Today, with increasing energy consumption and increasingly serious environmental pollution, wind energy, as a renewable green energy, has received widespread attention from all over the world, and wind power generation technology has also become a hot research topic among scholars from various countries in recent years. Wind energy is a random energy that changes frequently. The variable-speed constant-frequency wind power generation technology can ensure that the wind energy can be captured and utilized to the maximum at most wind speeds, and has incomparable advantages over the traditional constant-speed constant-frequency wind power generation technology. , and the doubly-fed wind turbine can well meet the technical requirements of variable-speed constant-frequen...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/14H02J3/18
CPCY02E10/763Y02E40/30Y02E10/76
Inventor 杨柳刘嫣红毛志怀
Owner CHINA AGRI UNIV
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