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Transient-state reconstruction system for improving fault ride-through capability of DFIG (Double-Fed Induction Generator) and control method

A fault ride-through and system reconfiguration technology, applied in the field of power system operation, analysis and dispatching, can solve problems such as increasing system hardware costs and difficulty in meeting wind turbine network access requirements

Inactive Publication Date: 2017-03-15
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Improving control strategies, such as de-excitation control, introducing PI-R controller as a supplement to PI controller, etc., can improve the fault ride-through capability of DFIG, but it is still difficult to meet the increasingly stringent grid-connection requirements of wind turbines in the grid-connected code
Adding hardware-assisted methods, such as installing a dynamic voltage restorer (DVR) and a series coupling compensation device (SCC) on the stator side, can effectively compensate the stator terminal voltage to a normal level and improve the fault ride-through capability of DFIG, but it will obviously increase significantly System hardware cost

Method used

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  • Transient-state reconstruction system for improving fault ride-through capability of DFIG (Double-Fed Induction Generator) and control method
  • Transient-state reconstruction system for improving fault ride-through capability of DFIG (Double-Fed Induction Generator) and control method
  • Transient-state reconstruction system for improving fault ride-through capability of DFIG (Double-Fed Induction Generator) and control method

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Embodiment

[0085] This patent verifies the effectiveness of the control method in improving the DFIG fault ride-through capability in the following two fault situations: 1) two-phase grounding, voltage drop fault; 2) three-phase voltage surge fault. This patent selects the traditional DFIG control method without an additional scheme as a comparison scheme to verify the superiority of the strategy proposed in this paper. Details are as follows:

[0086] 1) Simulation example of low voltage ride through control

[0087] Before the failure, the system was running in a super-synchronous state, and the slip s=-0.2. A two-phase AB ground fault occurs in the power grid at t=5s, and the fault phase voltage at PCC drops by 85%, and the fault lasts for 300ms. Since the fault duration is short and the wind speed changes little, it is assumed that the wind speed is constant.

[0088] Accompanying drawing 8 (a) is the voltage waveform of the grid during the fault period. When the grid fault is det...

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Abstract

The invention relates to a transient-state reconstruction system for improving fault ride-through capability of a DFIG (Double-Fed Induction Generator) and a control method. Firstly, a fault ride-through transient-state reconstruction topological structure of an energy storage DFIG is built by taking a traditional DFIG as foundation so as to achieve switching of an energy storage DFIG structure under a normal running state and a power grid voltage fault state; secondly, a stator voltage compensation mechanism and power flow thereof of the energy storage DFIG under the transient-state reconstruction topological structure when the power grid voltage is suddenly reduced and risen are analyzed; and finally, a control method of the transient-state reconstruction topological structure of the energy storage DFIG is acquired, and fault ride-through control of the DFIG under a power grid voltage fault is achieved. By the system, smooth control on an output power of a wind power plant under a normal running condition of a power grid can be achieved, meanwhile, the fault ride-through control of the DFIC can helped to achieve when the power grid voltage is suddenly reduced or risen, and the application value and the economic benefit of an energy storage device in a double-fed wind power generation system are improved.

Description

technical field [0001] The invention relates to the field of operation, analysis and scheduling of power systems, in particular to a transient reconfiguration system and a control method for improving the fault ride-through capability of a double-fed fan. Background technique [0002] With the rapid development of wind power in recent years, the penetration rate of wind power in the power grid has been increasing, and it is responsible for a part of the power balance of the power system. Network accidents pose a great threat to the stable operation of the power system. Among them, as one of the mainstream models, the doubly-fed fan (DFIG) is particularly sensitive to grid voltage faults because the stator side is directly connected to the grid, and is prone to off-grid accidents caused by grid voltage drops or sudden rises, which seriously restricts Grid-connected operation of DFIG. [0003] In order to ensure that the doubly-fed wind turbines can continue to operate witho...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/32
CPCH02J3/32H02J3/386Y02A30/60Y02E10/76Y02E70/30
Inventor 毛荀夏俊丽张旭昶刘军叶朝阳刘岩松胡江郑国强罗亚桥占勇王家宝孙琼王勤赵仲阳郭力
Owner STATE GRID CORP OF CHINA
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