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A method for virtual synchronous control of brushless doubly-fed machine

A doubly-fed machine, virtual synchronization technology, applied in the generator control circuit, control system, control generator and other directions, can solve the problems of power grid system stability and reliability decline

Inactive Publication Date: 2019-01-15
SHIHEZI UNIVERSITY
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, as the penetration rate of new energy continues to increase, the inertia in the grid gradually decreases, resulting in a decrease in the stability and reliability of the grid system.

Method used

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  • A method for virtual synchronous control of brushless doubly-fed machine
  • A method for virtual synchronous control of brushless doubly-fed machine
  • A method for virtual synchronous control of brushless doubly-fed machine

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Embodiment Construction

[0046] The present invention further elaborates on the virtual synchronous control method of the brushless doubly-fed motor through specific embodiments:

[0047] Such as figure 1 The structure diagram of the brushless doubly-fed motor is shown. The brushless doubly-fed motor adopts two double-stator winding structures with different pole pairs and no coupling, namely, the power winding (PW) and the control winding (CW).

[0048] Among them, the power winding is connected to the grid during grid-connected operation, and connected to the load during stand-alone operation; the control winding is connected to the back-to-back converter, and the control winding can realize variable voltage and frequency (VVVF) by controlling the converter, and the energy can flow in both directions, so that The motor can work in sub-synchronous, synchronous and super-synchronous modes. The speed of the motor rotor is:

[0049]

[0050] where ω p and ω c are the angular frequencies of the po...

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Abstract

Brushless doubly-fed machine (BDFM) is expected to be widely used in wind power generation due to its characteristics of doubly-fed machine without brush and slip ring. Doubly-fed wind turbine has a great influence on the system stability when it is connected to the grid through the power electronic interface, especially in the grid with high wind power permeability. If the wind turbine generatorsystem can have the friendly characteristics of traditional energy, it will greatly improve the stability of the system. Therefore, the invention provides a virtual synchronous control method for a brushless doubly-fed machine based on the control principle of the virtual synchronous generator, which simulates the operation characteristics of the synchronous generator. The phase angle and currentof the winding are controlled by active and reactive power respectively, and the operation characteristics of the synchronous motor are simulated. The inertia characteristics, frequency response characteristics and voltage regulation characteristics of synchronous generator set are simulated effectively by the control system.

Description

technical field [0001] The invention relates to the technical field of brushless double-fed motors, in particular to a virtual synchronous control method of brushless double-fed motors. Background technique [0002] On the basis of double-fed motors, brushless double-fed motors eliminate slip rings and brushes, reduce maintenance costs, and improve reliability. They are suitable for relatively harsh environments, especially for large-scale wind farms. However, as the penetration rate of new energy continues to increase, the inertia in the power grid gradually decreases, resulting in a decline in the stability and reliability of the power grid system. When the brushless double-fed motor is connected to the grid through the power electronic interface, it will have a great impact on the stability of the grid system, especially for the grid with a high penetration rate of wind power. If the brushless double-fed motor has the friendly characteristics of traditional energy, it wil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/48H02P9/00H02P9/10
CPCH02J3/386H02J3/48H02P9/007H02P9/105H02P9/107Y02E10/76
Inventor 鲁敏王澎张烨飞聂晶谢芹
Owner SHIHEZI UNIVERSITY
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