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Forced oscillation disturbance source identification and splitting method based on oscillation starting characteristic

A technology of forced oscillation and disturbance source, which is applied in the field of disturbance source decoupling, can solve the problems of power loss, large unbalanced power supply and demand, etc., achieve the effect of suppressing oscillation, overcoming large criterion errors, and ensuring stable operation

Active Publication Date: 2015-01-07
STATE GRID NINGXIA ELECTRIC POWER +2
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Problems solved by technology

However, if the power supply and demand imbalance is too large in the actual division of the power grid, unnecessary power loss will be caused

Method used

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  • Forced oscillation disturbance source identification and splitting method based on oscillation starting characteristic
  • Forced oscillation disturbance source identification and splitting method based on oscillation starting characteristic
  • Forced oscillation disturbance source identification and splitting method based on oscillation starting characteristic

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Embodiment Construction

[0036] The present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0037] figure 1 Step 1-1 in the above describes that when the system has a forced power oscillation, the energy function method is used to calculate the potential energy flow direction of the PMU monitoring line. If there is a node where the potential energy flow of all the connecting lines can only enter and exit, this node will be used as a disturbance source, that is, the area where the disturbance source is located only contains this node, go to step 2-1; otherwise, go to step 1-2.

[0038]figure 1 Step 1-2 in the description is to delete potential energy inflow nodes and perform topology analysis to determine the node set with no connection relationship formed thereby; if the set is unique, use this node set as the area where the disturbance source is located, and go to step 2-1; otherwise , take each set of unconnected nodes as the area wher...

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Abstract

The invention discloses a forced oscillation disturbance source identification and splitting method based on an oscillation starting characteristic and belongs to the technical field of emergency adjustment and control in an electric power system. According to the method, the oscillation starting characteristic of forced oscillation and a disturbance source location energy function method are combined, the correct position is identified from a plurality of suspected disturbance source areas, and if the disturbance source area meets the condition of electric energy supply and demand balance and no island exists in the non-disturbance source areas, a connection fracture surface line between the area where a disturbance source is located and a system can be split; otherwise, the identified area where the disturbance source is located serves as an initial island, adjacent nodes of the island are searched for, and the connection fracture surface is adjusted till the requirement for electric energy supply and demand balance is met and the condition that power grids remaining after splitting are connected is met. The method solves the problem about positioning of the disturbance source in forced oscillation control. Through the method, splitting control measures can be given in real time when oscillation is detected, and the method has great significance in suppressing oscillation and guaranteeing stable running of interconnected electric power systems.

Description

technical field [0001] The invention belongs to the technical field of emergency regulation and control of electric power systems. More precisely, the invention relates to a method suitable for identifying a disturbance source when a forced low-frequency oscillation occurs in a power grid, and then separating the disturbance source. Background technique [0002] With the strengthening of the grid structure of the power system and the improvement of various damping control devices in the system, the traditional weakly damped low-frequency oscillation has rarely occurred, and forced oscillation has become the main form of low-frequency oscillation accidents. Since the forced oscillation has the characteristics that the disturbance source is clear and the system oscillation can automatically calm down after the disturbance is eliminated, locating the disturbance source and separating the disturbance source from the system are effective means to suppress the forced oscillation. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24G01R31/08
CPCG01R31/085H02J3/24Y02E40/70Y02E60/00Y04S10/00Y04S10/22
Inventor 耿天翔鲍颜红项丽李峰摆世彬徐伟陈颜方勇杰
Owner STATE GRID NINGXIA ELECTRIC POWER
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