Analysis method for subsynchronous oscillation generated by grid connection of wind driven generators

A technology of wind power generators and subsynchronous oscillation, which is applied in the fields of electrical digital data processing, special data processing applications, instruments, etc., and can solve the problems that subsynchronous oscillation cannot be effectively monitored and dealt with.

Active Publication Date: 2016-04-13
STATE GRID CORP OF CHINA +1
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Problems solved by technology

However, at present, there is no quantitative research on the causes of subsynchronous oscillations caused by wind turbines connected to the

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  • Analysis method for subsynchronous oscillation generated by grid connection of wind driven generators
  • Analysis method for subsynchronous oscillation generated by grid connection of wind driven generators
  • Analysis method for subsynchronous oscillation generated by grid connection of wind driven generators

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[0092] In order to make the objectives, technical solutions, and advantages of the present invention clearer and more comprehensible, the present invention will be further described in detail below in conjunction with embodiments and drawings. Here, the exemplary embodiments of the present invention and the description thereof are used to explain the present invention, but not as a limitation to the present invention.

[0093] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0094] reference figure 1 As shown, the method for analyzing the subsynchronous oscillation generated by the grid-connected wind generator of the embodiment of the present invention includes the following steps:

[0095] Step S101: Establish a linearized system model in which a wind generator (such as a doubly-fed induction wind generator) is connected to an infinite power system via a series compensation capacitor. The li...

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Abstract

The invention provides an analysis method for subsynchronous oscillation generated by grid connection of wind driven generators. The analysis method comprises following steps: establishing a linearized system model formed in such a manner that wind driven generators are connected to an infinite-bus power system via series compensation capacitance; calculating static stable points of the linearized system model; obtaining characteristic roots of a coefficient matrix of the linearized system model and left and right feature vectors thereof; obtaining all oscillation frequencies of the linearized system model according to characteristic roots and obtaining state variables related to the oscillation modes of the all the oscillation frequencies in the linearized system model; and varying parameter values of the state variables in order to acquire states in which all the oscillation frequencies vary with the corresponding state variables.The analysis method for subsynchronous oscillation generated by grid connection of wind driven generators has following beneficial effects: a quantitative analysis on subsynchronous oscillation generated by grid connection of wind driven generators can be made so that subsynchronous oscillation generated by grid connection of wind driven generators can be effectively monitored and addressed.

Description

Technical field [0001] The invention relates to the analysis and research of the sub-synchronous oscillation generated by the grid-connected wind generator, in particular to an analysis method of the sub-synchronous oscillation generated by the grid-connected wind generator. Background technique [0002] Large-scale wind turbines are generally integrated into the grid through series-compensated AC transmission mode, which can increase the transmission capacity, but at the same time may cause sub-synchronous oscillation problems, which may easily cause the wind turbine to disconnect from the grid. The subsynchronous oscillations of wind turbines mainly include induction generator effect (IGE), subsynchronous control interaction (SSCI), and subsynchronous shaft torsional vibration effect (SSTI). According to the current research, due to the use of the controller of the power electronic device in the wind power generation system, the subsynchronous control interaction (SSCI) is the ...

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Application Information

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IPC IPC(8): G06F19/00
CPCY02E60/00
Inventor 刘辉李雨李蕴红刘京波吴林林王皓靖王倩
Owner STATE GRID CORP OF CHINA
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