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RMC-based DFIG (Doubly Fed Induction Generator) direct-current grid-connected power generation system and magnetic chain directional control method thereof

A technology for grid-connected power generation and high-voltage DC power grid, which is applied in parallel operation of DC power supplies and conversion of irreversible AC power input to DC power output. And other issues

Active Publication Date: 2013-11-20
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This grid-connected system must use the sending end station to change the DFIG output power from AC transmission to DC transmission, and the sending end station needs to maintain a stable motor stator terminal voltage under different working conditions. The system structure is complex and the control is difficult.
In addition, the traditional converters used in HVDC have many conversion stages, which increases energy loss, and the use of electrolytic capacitors for voltage stabilization increases the volume and weight of the system, while reducing the reliability of the system

Method used

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  • RMC-based DFIG (Doubly Fed Induction Generator) direct-current grid-connected power generation system and magnetic chain directional control method thereof
  • RMC-based DFIG (Doubly Fed Induction Generator) direct-current grid-connected power generation system and magnetic chain directional control method thereof
  • RMC-based DFIG (Doubly Fed Induction Generator) direct-current grid-connected power generation system and magnetic chain directional control method thereof

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Embodiment Construction

[0070] In order to describe the present invention more specifically, the technical solution and its control method of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0071] Such as figure 2 As shown, an RMC-based DFIG DC grid-connected power generation system includes multiple DFIGs and high-voltage DC grids. Each DFIG is connected with a stator RMC converter and a rotor RMC converter; a stator RMC converter and a rotor RMC converter There is a controller connected to the converters; DFIG has three-phase stator windings and three-phase rotor windings, and the three-phase stator windings and three-phase rotor windings are all connected in a star connection; where:

[0072] Such as image 3 As shown in (a), the stator RMC converter includes RMC, single-phase high-frequency transformer T and single-phase full-bridge uncontrolled converter. The three-phase AC side of RMC is connected to the three-pha...

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Abstract

The invention discloses an RMC-based DFIG (Doubly Fed Induction Generator) direct-current grid-connected power generation system. The system comprises a plurality of DFIGs and a high-voltage direct-current grid, wherein each DFIG is connected with a stator RMC current converter and a rotor RMC current converter which are both connected with a controller; the stator RMC current converter plays the role of converting alternating current output by the DFIG into direct current, boosting the voltage to voltage level of HVDC and meanwhile realizing maximum wind energy tracking operation of the DFIG; and the rotor RMC current converter plays the role of providing excitation for a DFIG rotor and meanwhile realizing stable DFIG stator terminal voltage control. The invention also discloses a magnetic chain directional control method of the system. Transmission of power is directly changed into high-voltage direct current transmission from alternating current transmission by the stator side RMC current converter. The system is simple in structure and stable in running performance, so that the control on the DFIG and direct-current transmission is simplified.

Description

technical field [0001] The invention belongs to the technical field of wind power grid-connected power generation, in particular to an RMC (reduced matrix converter)-based DFIG DC grid-connected power generation system and a flux linkage directional control method thereof. Background technique [0002] With the increase of population and the development of economy, human beings' demand for energy is also increasing, and the traditional energy reserves are becoming increasingly exhausted, thus bringing about the problem of energy shortage. With the depletion of traditional energy sources, wind energy has become a very promising new energy source. In today's society, the wind power industry has become a pillar industry in the field of new energy sources. [0003] With the wide application of onshore wind farms, offshore wind farms are also developing continuously. Compared with onshore wind farms, offshore wind power has become an important sustainable energy source due to it...

Claims

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Application Information

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IPC IPC(8): H02J1/10H02M7/12
Inventor 易曦露年珩
Owner ZHEJIANG UNIV
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