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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 field of new energy research, and can solve problems such as large dependence on system parameters and inability to directly detect stator flux linkage

Inactive Publication Date: 2012-07-11
XI AN JIAOTONG UNIV
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Problems solved by technology

However, the stator flux linkage cannot be directly detected. The stator flux linkage required in the traditional solution is observed through the stator electromotive force and the stator current. The process of observing the flux linkage needs to know the resistance value of the stator resistance
Because there is no way to directly measure the resistance value of the stator resistance, and it will change with the working conditions of the system, so the traditional demagnetization control is very dependent on the system parameters

Method used

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

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Embodiment Construction

[0049] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0050] refer to figure 1 , a typical doubly-fed wind turbine includes wind turbines, gearboxes, doubly-fed motors, back-to-back converters and step-up transformers. Since the converter only handles slip times the rated power, its cost, volume, and loss are lower than those of a full-power converter, so it is widely used in wind power generation systems. However, since the stator of the doubly-fed wind turbine is directly connected to the grid, grid faults will be transmitted to the rotor converter through the coupling of the stator and rotor of the motor, thus posing a great threat to the motor.

[0051] When no demagnetization control is applied, the response of the doubly-fed motor under 50% grid voltage drop is shown in Figure 2. It can be seen that the voltage drop caused by the grid fault produces a DC component in the stator flux linkage, and this DC ...

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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.

Description

【Technical field】 [0001] The invention relates to the research field of new energy (wind power generation), in particular to a demagnetization control method of 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 low...

Claims

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Application Information

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IPC IPC(8): H02P9/12
Inventor 刘进军周临原周思展朱仰榷
Owner XI AN JIAOTONG UNIV
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