Energy flow-based identification method for subsynchronous oscillation disturbance source in power system

A technology of subsynchronous oscillation and power system, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of evaluating damping state, unable to accurately find equipment disturbance sources, etc., to improve pertinence, improve analysis technology and control The effect of technical level

Active Publication Date: 2018-10-30
TSINGHUA UNIV
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Problems solved by technology

[0003] The present invention provides an energy flow-based method for identifying disturbance sources of subsynchronous oscillations in power systems, which is used to solve the problems in the prior art that the disturbance sources of equipment cannot be accurately found and the damping state can be evaluated

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  • Energy flow-based identification method for subsynchronous oscillation disturbance source in power system

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Embodiment Construction

[0025] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0026] figure 1 It shows a power system subsynchronous oscillation disturbance source identification method based on energy flow provided by an embodiment of the present invention, including:

[0027] S1. Collect the three-phase voltage value and the three-phase current value of the device under test within a preset time period under the working state of the device under test. In this step, the three-phase voltage values ​​and three-phase current values ​​collected within the preset time period are actually functions of the preset time t. The equipment to be tested is a variety of equipment such as generators, series capacitors, and wind farms. In the embodiment of the ...

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Abstract

The invention provides a power system subsynchronous oscillation disturbance source identification method based on energy flow. The method comprises the following steps: collecting a three-phase voltage value and a three-phase current value of a device to be measured in a preset time period under the working state of the device to be measured; carrying out identification on any phase of current in the collected current value to obtain fundamental frequency, subsynchronous frequency and super-synchronous frequency as well as torsion frequency; carrying out transformation on the collected voltage value and current value to obtain a voltage value and a current value under XY coordinates; obtaining a voltage component value and a current component value of the torsion frequency according to the voltage value and the current value under XY coordinates and the torsion frequency; obtaining energy flow according to the voltage component value and the current component value and calculating energy flow power; and determining a disturbance source and damping state of the device according to the positive and negative values of the energy flow power. The disturbance source is identified and damping performance of the device is evaluated according to the energy flow flowing into the device.

Description

technical field [0001] The invention relates to the technical field of power system analysis, in particular to a method for identifying a subsynchronous oscillation disturbance source in a power system based on energy flow. Background technique [0002] Subsynchronous oscillation is a prominent problem that threatens the safe operation of power systems. Subsynchronous oscillation refers to the oscillation in the power system whose frequency is lower than the power frequency but higher than the low frequency oscillation frequency (0.1-2.5Hz). Early subsynchronous oscillations are mainly caused by series capacitors. In recent years, subsynchronous oscillations caused by power electronic devices such as high-voltage direct current and wind farms have occurred frequently, seriously affecting the safe operation of generators and power grids. After the subsynchronous oscillation occurs in the system, it is necessary to quickly and accurately identify the source of the disturbanc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 陈磊闵勇徐飞王文婕
Owner TSINGHUA UNIV
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