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DFIG direct current grid-connected power generation system based on RMC and torque control method of DFIG direct current grid-connected power generation system

A torque control and grid-connected power generation technology, which is applied in the direction of motor generator control, electronic commutation motor control, control system, etc., can solve the problems of many converter conversion stages, difficult control, and reduced system reliability.

Active Publication Date: 2015-05-20
ZHEJIANG UNIV
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  • Summary
  • 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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  • DFIG direct current grid-connected power generation system based on RMC and torque control method of DFIG direct current grid-connected power generation system
  • DFIG direct current grid-connected power generation system based on RMC and torque control method of DFIG direct current grid-connected power generation system
  • DFIG direct current grid-connected power generation system based on RMC and torque control method of DFIG direct current grid-connected power generation system

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Embodiment Construction

[0081] 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.

[0082] like 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:

[0083] The stator RMC converter is used to convert the DC voltage on the high-voltage DC grid into a positive and negative alternating square wave voltage during the start-up phase of DFIG, and step down the square wave voltage, and then...

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Abstract

The invention discloses a DFIG direct current grid-connected power generation system based on an RMC. The DFIG direct current grid-connected power generation system comprises a plurality of DFIGs and a high-voltage direct current power grid; each DFIG is connected with a stator RMC converter and a rotor RMC converter; each stator RMC converter and the corresponding rotor RMC converter share one controller. Compared with a traditional DFIG grid-connected system, the DFIG system enables an industrial frequency transformer to be smaller in size and lighter in weight. According to the DFIG system, the number of levels of the converters is reduced, a voltage stabilizing capacitor with the large size is replaced by a filter capacitor with the small size and the light weight, and the system is simple in structure and stable in operation performance. The invention further discloses a torque control method of the system, through the synergistic effect of the stator RMC converters and the rotor RMC converters, the constant electromagnetic torque output by the DFIGs and the constant amplitude of air gap flux linkage are guaranteed, and the output active power and the input reactive power of the stator side and the rotor side of a motor are controlled to be equal.

Description

technical field [0001] The invention belongs to the technical field of wind power grid-connected power generation, and specifically relates to an RMC (reduced matrix converter)-based DFIG DC grid-connected power generation system and a torque 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 its advan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/36H02P21/14
Inventor 易曦露年珩
Owner ZHEJIANG UNIV
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