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Control method for online dynamically restraining power grid low frequency oscillation and subsynchronous oscillation

A sub-synchronous oscillation and low-frequency oscillation technology, applied in the direction of reducing/preventing power oscillation, wind power generation, flexible AC transmission system, etc., to achieve the effect of solving sub-synchronous oscillation, stabilizing wind power generation system, fast active power and reactive power

Inactive Publication Date: 2016-01-06
TBEA SUNOASIS +1
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Problems solved by technology

There is currently no solution for damping control using SVG

Method used

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  • Control method for online dynamically restraining power grid low frequency oscillation and subsynchronous oscillation
  • Control method for online dynamically restraining power grid low frequency oscillation and subsynchronous oscillation
  • Control method for online dynamically restraining power grid low frequency oscillation and subsynchronous oscillation

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Embodiment Construction

[0028] The scheme of the present invention is described in detail below in conjunction with accompanying drawing and specific embodiment:

[0029] refer to figure 1 , 2. The present invention is based on the given feed-forward equivalent damping control strategy based on the static var generator on-line dynamic suppression of grid subsynchronous oscillations, including filtering and screening of active power components and reactive power components of grid subsynchronous oscillations, and modal filtering The design and implementation of the controller, the design of the feed-forward equivalent damping control strategy and the overall control scheme for SVG suppression of subsynchronous oscillation are given.

[0030] The present invention is specifically realized through the following steps:

[0031] Step 1, collect the grid current i through the current sensor and voltage sensor of the static var generator a , i b , i c and grid voltage v a , v b , v c , the grid curre...

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Abstract

The invention provides a control method for online dynamically restraining power grid low frequency oscillation and subsynchronous oscillation. Firstly, power grid voltage and current are acquired via a sensor, and after the voltage and the current are converted into signals readable by a digital processor, online real-time quick FFT is carried out via a digital signal processor (DSP); then, an SVG current control strategy is designed, and the SVG outputs accurate reactive power compensation according to a real-time power grid low frequency oscillation component and a subsynchronous oscillation component. On the basis of the original SVG control strategy, control algorithm for online dynamically restraining power grid subsynchronous oscillation is added, positive damping can be effectively provided with a wind farm, and a wind power generation system is stabilized; and compared with the existing restraining strategy, the SVG can output more accurate and quicker active power and reactive power according to the real-time power grid subsynchronous oscillation component, and the subsynchronous oscillation problem in the power grid is solved.

Description

【Technical field】 [0001] The invention belongs to the field of control technology application of power grid reactive power compensation system, in particular to a control method for online dynamic suppression of low-frequency oscillation and sub-synchronous oscillation of power grid. 【Background technique】 [0002] my country has a vast territory, and the development of energy and economy is reversely distributed geographically, which is extremely unbalanced. Long-distance and large-capacity power transmission is imperative. Using fixed series compensation to solve the problem of power limitation in high-voltage long-distance transmission is an effective way to achieve safe operation of the power grid and economical power transmission, and to solve the problem of limited power transmission in my country. However, fixed series compensation While improving the transmission capacity of transmission lines, power transmission also brings subsynchronous oscillation problems to some...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02J3/18
CPCY02E10/76Y02E40/10
Inventor 郝翔乔梁刘伟增薄志刚
Owner TBEA SUNOASIS
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