A grid-connected system and control method for doubly-fed wind power generators integrated into a DC transmission and distribution network

A technology of wind power generators and control methods, applied in the field of grid-connected systems and their control, capable of solving problems such as high cost and complicated installation, achieving the effects of improving reliability and efficiency and reducing grid-connected costs

Active Publication Date: 2018-11-30
STATE GRID HEBEI ELECTRIC POWER RES INST +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the voltage source converter is used to connect the doubly-fed wind turbine (DFIG) to the grid, which is costly and complicated to install.

Method used

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  • A grid-connected system and control method for doubly-fed wind power generators integrated into a DC transmission and distribution network
  • A grid-connected system and control method for doubly-fed wind power generators integrated into a DC transmission and distribution network
  • A grid-connected system and control method for doubly-fed wind power generators integrated into a DC transmission and distribution network

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Embodiment Construction

[0049] Combine below figure 1 , figure 2 , Figure 3-a~Figure 3-e And embodiment further describes the present invention.

[0050] The grid-connected system adopted in this embodiment includes a doubly-fed wind power generator 1, a local load 2, a diode uncontrolled rectifier converter 3 and an AC filter 4; The bus bar 5 supplies the local load 2, and the rest of the electric energy generated by the doubly-fed wind power generator 1 is connected to the diode uncontrolled rectifier converter 3 through the AC bus bar 5 and then imported into the bus bar 6 in the DC distribution network , the AC filter 4 is connected to the AC bus 5 .

[0051] Further, the diode uncontrolled rectifier converter 3 is a double-bridge twelve-pulse uncontrolled rectifier converter.

[0052] figure 2 is the control schematic diagram of the rotor-side converter of the wind turbine, and the implementation process of the control strategy of the rotor-side converter is as follows:

[0053]The grid...

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Abstract

The invention discloses a grid-connected system of merging a doubly-fed wind generator into a direct current transmission and distribution network and a control method thereof and belongs to the distributed-energy-generation and grid-connected field. The grid-connected system comprises the doubly-fed wind generator, a local load, a diode uncontrolled rectifier inverter and an alternating current filter. One part of electric energy emitted by the doubly-fed wind generator is provided for the local load through an alternating current bus. A residual part of the electric energy emitted by the doubly-fed wind generator is connected to the diode uncontrolled rectifier inverter through the alternating current bus and then flows into a conflux bus of a direct current power distribution network. The alternating current filter is connected to the alternating current bus. The control method is characterized in that the doubly-fed wind generator is merged into the conflux bus of the direct current power distribution network through the diode uncontrolled rectifier inverter; and through changing a control strategy of a rotor side inverter of the doubly-fed wind generator, grid connection is realized. The system and the method have advantages that cost is low, efficiency is high and reliability is high too.

Description

technical field [0001] The invention relates to a grid-connected system in which a doubly-fed wind power generator is integrated into a DC transmission and distribution network and a control method thereof, belonging to the field of distributed energy generation and grid-connected. Background technique [0002] With the continuous development of distributed energy in the power system, and the deepening of domestic and foreign scholars' research on DC transmission and distribution technology, how to realize the low-cost, high-efficiency, and high-reliability integration of distributed energy into the DC transmission and distribution network has caused received widespread attention. [0003] Generally speaking, when the doubly-fed wind generator (DFIG) exists in the DC distribution network as a distributed power source, part of the electric energy generated by it is used to supply the local load, and the rest is imported into the DC distribution network through the voltage sou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J1/10
CPCH02J1/10
Inventor 胡文平郭捷王磊段晓波周文马慧卓
Owner STATE GRID HEBEI ELECTRIC POWER RES INST
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