Demagnetizing control method for double-feeding type wind power generation system to LVRT (Low Voltage Ride Through)

A technology of wind power generation system and low voltage ride through, which is applied in the direction of control system, control generator, electrical components, etc. It can solve the problems that the stator flux linkage cannot be directly detected and the system parameter dependence is large.
CN102570952BInactive Publication Date: 2014-04-23XI AN JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XI AN JIAOTONG UNIV
Publication Date
2014-04-23
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a demagnetizing control method for a double-feeding type wind power generation system to LVRT (Low Voltage Ride Through). A converter on a rotor side is utilized to inject a rotor demagnetizing current component reverse to a stator direct current (space vector) into a rotor loop, so that the accelerating attenuation for a stator direct current magnetic chain is realized. During the control process, only a stator current amplitude value is detected and the stator magnetic chain need not be observed, so that the demagnetizing control method is free from dependence on system parameters. According to a simulated result, the demagnetizing control method provided by the invention is capable of effectively realizing the attenuation for the stator direct current magnetic chain, is free from dependence on the system parameters, and is stronger in robustness.
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Description

【Technical field】

[0001] The invention relates to the field of new energy (wind power generation) research, in particular to a demagnetization control method for a stator DC flux linkage during a grid failure and recovery period of a doubly-fed wind power generation system. 【Background technique】

[0002] Since the 1970s, energy and environmental protection have gradually become one of the world's mainstream concerns. With the continuous increase of energy consumption and the continuous reduction of traditional energy sources, the development of new energy sources has attracted widespread attention and promotion from the whole society. Among them, wind power generation has achieved rapid development in recent years because of its large-scale utilization and low cost. Double-fed wind power generation system has become the mainstream choice in wind power generation system due to its advantages of variable speed operation, independent control of active and reactive power and lo...

Claims

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