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Method for distinguishing transient state instability of electric power system in real time based on voltage track after disturbance

A technology of transient instability and power system, applied in the direction of reducing/preventing power oscillation, etc., which can solve problems such as the security and stability of the crisis power grid, and the lack of operation procedures.

Active Publication Date: 2012-06-27
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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Problems solved by technology

However, this method uses a direct integration algorithm. If the voltage drops rapidly, it will cause a missed judgment, which will endanger the safety and stability of the power grid. In addition, the original text only provides an open idea for setting up points and judgment schemes for the actual power grid in the United States, and does not give a complete solution. Running the process, there are still many problems to be solved

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  • Method for distinguishing transient state instability of electric power system in real time based on voltage track after disturbance
  • Method for distinguishing transient state instability of electric power system in real time based on voltage track after disturbance
  • Method for distinguishing transient state instability of electric power system in real time based on voltage track after disturbance

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Embodiment 1

[0060] figure 1 A schematic diagram of the disturbed voltage trajectory with the fault duration is given, in which 11 is a stable trajectory, 12 is a critical trajectory, and 13 is an unstable trajectory. For the same fault, the drop range and drop speed of the voltage trajectory gradually increase with the increase of the disturbance intensity, and the transient characteristics of the system gradually change from stable to unstable. Research shows that by observing the voltage data within a certain time window, establishing a specific integration method, and analyzing the transition characteristics of the trajectory from stable to unstable, the integral value that distinguishes the stable trajectory from the unstable trajectory can be obtained. The threshold is used to realize the early warning of power system transient instability, which is called the threshold of transient instability.

[0061] Combine below figure 2 The flow chart of the present invention specifically i...

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Abstract

The invention relates to the technical field of fault distinguishment in an electric power system, in particular to a method for distinguishing transient state instability of the electric power system in real time based on voltage track after disturbance. The method comprises five steps, namely, selecting a voltage observation node, identifying voltage drop after fault clearance, complexly integrating the voltage track, distinguishing the transient state instability of the electric power system and identifying the fact that local voltage is over-low. The method for distinguishing the transient state instability of the electric power system in real time based on the voltage track after disturbance, disclosed by the invention, aims to solve a problem of system transient state instability caused by large disturbance out of a two-defense-line control range based on a measurement configuration of the existing phasor measurement unit ( PMU ) and a wide area measurement system ( WAMS ) in a power grid, and has the advantages of simple algorithm, low calculated quantity, less dependence on data precision and high reliability.

Description

technical field [0001] The invention relates to the technical field of power system fault discrimination, in particular to a real-time discrimination method for power system transient instability based on a disturbed voltage trajectory. Background technique [0002] With the interconnection of the power grid, the scale of the power system is increasing day by day, and the dynamic behavior of the system is becoming more and more complex. The influence range of local faults increases, which may cause cascading faults, and then lead to large-scale power outages. The existing conventional control strategies based on events in power systems still have many deficiencies in terms of adaptability, predictive speed, control efficiency, and reliability. The application of GPS technology and synchrophasor measurement unit (PMU) in power system has created conditions for the realization of power system transient instability warning based on measured trajectory. [0003] The real-time j...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
Inventor 门锟柳勇军许爱东赵勇吴小辰
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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