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Excitation control method of doubly-fed wind-driven generator

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

Inactive Publication Date: 2014-01-22
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 power generator active power control method, to provide a doubly-fed wind power generation that does not require complex transformations and calculations such as vector rotation changes, and can realize decoupling control of active and reactive power machine excitation control method

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  • Excitation control method of doubly-fed wind-driven generator
  • Excitation control method of doubly-fed wind-driven generator
  • Excitation control method of doubly-fed wind-driven generator

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Embodiment Construction

[0051] The present invention will be further described in detail below in conjunction with specific embodiments.

[0052] 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.

[0053] Document 1: "Estimation and Measurement of Asynchronous Motor Parameters in Vector Control System", Ma Xiaoliang, Electric Drive, Volume 40, Issue 7, 2010.

[0054] The gene...

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Abstract

The invention relates to an excitation control method of a doubly-fed wind-driven generator. The doubly-fed wind-driven generator has a doubly-fed motor. The motor includes: a stator, which supplies power for a power grid having a voltage with a rated value; and a driving rotor, which is coupled with the stator. One end of the rotor is connected with a wind turbine by a change-speed gear. A rotor winding is a three-phase wound rotor winding. The power grid supplies power for the rotor by a current transformer; and a stator voltage and a stator linkage are deposed on an xsynchronization rotation dq coordinate axis; therefore, it can be realized that power output by the generator stator is controlled by adjusting the rotor current. According to the method provided in the invention, there is no need to carry out complex conversion and calculation like vector rotation changing and the like; active and reactive decoupling control can be realized; a current control module has low control sensitivity; a circuit parameter and measurement time delay of a current transformer system has a little influence on current control; and the control technology is simple and thus cost of the controller is reduced.

Description

technical field [0001] The invention relates to a wind power generator, in particular to an excitation control method for 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-frequency win...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/14H02P21/16
Inventor 杨柳刘嫣红毛志怀
Owner CHINA AGRI UNIV
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