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Over-speed load-reducing control variable parameter virtual inertia control method for doubly-fed wind generator

A technology of wind power generators and virtual inertia, applied in wind power generation, electrical components, circuit devices, etc., can solve problems such as weak primary frequency adjustment ability

Inactive Publication Date: 2018-08-03
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

[0003] To sum up, the problems existing in the existing technology are: the traditional virtual inertia control is relatively weak in primary frequency adjustment due to the fixed control parameters and the contradiction with the maximum power tracking control.

Method used

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  • Over-speed load-reducing control variable parameter virtual inertia control method for doubly-fed wind generator

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Embodiment Construction

[0045] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0046] The invention enables DFIG to have power-frequency response characteristics, and can coordinate with the synchronous generators in the power grid to jointly participate in the primary adjustment of the power system frequency; a large-scale wind farm is built on the DIgSILENT / PowerFactory simulation platform based on the IEEE15 busbar system The system model of the system is simulated, and the control method of the wind farm participating in primary frequency regulation is compared and analyzed.

[0047] The application principle of the present invention will be described in detail below in conjunction with the accomp...

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Abstract

The invention belongs to the technical field of wind power generation, and discloses an over-speed load-reducing control variable parameter virtual inertia control method for a doubly-fed wind generator. According to the over-speed load-reducing control variable parameter virtual inertia control method for the doubly-fed wind generator, over-speed load-reducing control is used, active power is reserved for use, and the rotation speed of a fan is larger than the rotation speed obtained when maximum power tracking control is used. When the frequency of a system is reduced, virtual inertia control enables the speed of a rotor of the fan to be reduced, and then stored rotary kinetic energy is released; meanwhile, the rotation speed of a wind turbine is reduced, and a running point is close tothe maximum power tracking point. According to the method, the change of the frequency of the electric power system can be quickly responded by adopting virtual inertia control, and the power output is quickly changed before the action of a speed regulator of a synchronous machine. The doubly-fed wind turbine generator using the comprehensive control method can be used for more effectively reducing the fluctuation amplitude of the frequency, and a doubly-fed wind turbine generator using common inertia control cannot quickly release or reduce a large amount of active power.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to a variable parameter virtual inertia control method for overspeed load shedding control of a doubly-fed wind power generator. Background technique [0002] The inertia of the power system reflects the system's ability to prevent sudden frequency changes, so that the generator has enough time to adjust the power generation and rebuild the power balance. Variable-speed wind turbines (including double-fed asynchronous wind turbines and permanent magnet direct-drive wind turbines) decouple the wind turbine rotor from the grid frequency due to the existence of their converters, and cannot respond to grid frequency changes like synchronous generators. response. Due to the contradiction between the droop control and the maximum power tracking, if the control coefficient of the droop link is too large, the active power will be excessively output in the process ...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/24H02J3/48
CPCH02J3/24H02J3/386H02J3/48H02J2203/20Y02E10/76
Inventor 王德林蔡瑞清杨丰波胡一鸣
Owner SOUTHWEST JIAOTONG UNIV
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