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Method for suppressing low-frequency oscillation of electric power system

A low-frequency oscillation and power system technology, applied in the direction of reducing/preventing power oscillation, circuit devices, AC network circuits, etc., can solve problems such as failure to reach the damping level, poor resonance mechanism low-frequency oscillation damping effect, etc., to achieve simple control, The effect of reducing reliance on expert experience

Active Publication Date: 2018-06-26
STATE GRID JIANGSU ECONOMIC RES INST +3
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Problems solved by technology

However, the additional damping control of the traditional unified power flow controller does not have a good damping effect on the low-frequency oscillation of the resonance mechanism. The reason is that the disturbance source of the low-frequency oscillation of the resonance mechanism continuously injects power disturbance into the system, and a high damping level is required to suppress it. However, the traditional method cannot reach the corresponding damping level

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  • Method for suppressing low-frequency oscillation of electric power system
  • Method for suppressing low-frequency oscillation of electric power system
  • Method for suppressing low-frequency oscillation of electric power system

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Embodiment Construction

[0038] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0039] Such as figure 2 , the method for suppressing the low-frequency oscillation of the power system in this embodiment includes the following steps:

[0040] Step 1) Collect the low-frequency oscillation signal source of the system, process the signal source with a DC blocking link, and use a band-pass filter to filter the signal source to obtain the low-frequency oscillation deviation signal Δω in each mode i , where i is the ith channel corresponding to the additional damping controller.

[0041] Step 2) For the low-frequency oscillation deviation signal Δω in each oscillation mode i Perform preprocessing to obtain the rate of change of the speed deviation signal The preprocessing of this embodiment detects the low-frequency oscillation deviation signal and the rate-of-change signal of the signal.

[0042] Step 3) Convert Δω i , ...

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Abstract

The invention relates to a method for suppressing low-frequency oscillation of an electric power system. The method comprises the steps of performing signal collection on the system through a measurement link, and performing a blocking link processing on the obtained signal source; then performing filtering processing on the signal source by a bandpass filtering link to obtain low-frequency oscillation rotary speed and change rate signals thereof in each oscillation mode; next, generating an additional damping control signal through a Sugeon type fuzzy inference system, performing amplifying,overlaying, and amplitude limiting on the obtained control signal, and then introducing controlled quantity to a DQ decoupled vector-controlled UPFC current control inner loop; and finally, injectinga low-frequency current of the corresponding frequency to the system through a UPFC apparatus so as to suppress the low-frequency oscillation of the electric power system.

Description

technical field [0001] The invention relates to power system stability and control technology, in particular to a method for suppressing low-frequency oscillation of the power system. Background technique [0002] Resonance mechanism Low-frequency oscillation is caused by the frequency of the external periodic power disturbance source being close to the inherent low-frequency oscillation frequency of the system. In recent years, due to the expansion of power system capacity and grid-connected scale, the power disturbance sources in the system have increased, and the low-frequency oscillation of the resonance mechanism has occurred from time to time, causing serious harm to the safe and stable operation of the power system. [0003] The emergence of flexible AC power transmission system (FACTS) provides a new effective means for suppressing the low-frequency oscillation of the resonance mechanism. The unified power flow controller (UPFC) is currently the most comprehensive FA...

Claims

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Application Information

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IPC IPC(8): H02J3/24
CPCH02J3/24H02J2203/20
Inventor 蔡晖吴熙祁万春谢珍建黄俊辉孙文涛王荃荃张文嘉
Owner STATE GRID JIANGSU ECONOMIC RES INST
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