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A transient stability identification method based on voltage trajectory characteristics

A technology of transient stability and identification method, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve problems affecting the accuracy of calculation results, system model and parameter deviation, etc., to improve timeliness, reduce costs, and predict accuracy high effect

Active Publication Date: 2018-12-18
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are some deviations in the system model and parameters, which affect the accuracy of the calculation results.

Method used

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  • A transient stability identification method based on voltage trajectory characteristics
  • A transient stability identification method based on voltage trajectory characteristics
  • A transient stability identification method based on voltage trajectory characteristics

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1: as Figure 1-3 As shown, a transient stability identification method based on the characteristics of the voltage trajectory collects the information of the bus node in the power system at a certain moment through the wide-area measurement system; judges whether there is a fault in the power system, and if a fault occurs, select the fastest voltage drop The bus node of the observation point is used as the observation point; select the two units with the largest generator power angle difference, and calculate the electrical distance from the observation point to the two units; predict the future voltage according to the historical data of the observation point voltage; The relationship between the minimum value of and the electrical distance can be used to judge whether the power angle instability of the system occurs.

[0038] The specific steps are:

[0039] Step S1: At time t, collect the power angle δ of the i-th generator in the power system in real ti...

Embodiment 2

[0050] Embodiment 2: In order to verify the stability identification method based on phase trajectory and transient energy proposed in this paper, the BPA program is used to simulate the same fault at different locations and the different duration of the same fault on the IEEE10 machine 39 node system. The calculation step is 0.01s, and the generator uses E q'Model. The operation mode is 80% constant impedance and 20% constant current load at the 4th busbar, 70% constant impedance and 30% constant current load at the 7th busbar, and 50% constant impedance and 30% constant current load at the 15th busbar. Constant current, 20% constant power load, 30% constant impedance, 70% constant power load at the bus bar 23 . The fault is set as a three-phase short-circuit fault occurs at 0s on the line connected from bus 26 to bus 29, and the line is cut off at 0.28s.

[0051] Step S1, at time t, collect the power angle of the th generator and the voltage of the qth bus node in the powe...

Embodiment 3

[0057] Embodiment 3: In order to verify the stability identification method based on phase trajectory and transient energy proposed in this paper, the BPA program is used to simulate the same fault at different locations and the different duration of the same fault on the IEEE10 machine 39 node system. The calculation step is 0.01s, and the generator uses E q 'Model. The operation mode is 80% constant impedance and 20% constant current load at the 4th busbar, 70% constant impedance and 30% constant current load at the 7th busbar, and 50% constant impedance and 30% constant current load at the 15th busbar. Constant current, 20% constant power load, 30% constant impedance, 70% constant power load at the bus bar 23 . The fault is set as a three-phase short-circuit fault occurs in the line connected from bus 26 to bus 29 at 0s, and the line is cut off at 0.20s.

[0058] Step S1, at time t, collect the power angle of the th generator and the voltage of the qth bus node in the pow...

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Abstract

The invention relates to a transient stability identification method based on voltage trajectory characteristics, belonging to the technical field of power system stability. The method includes collecting bus node information at a certain moment in a power system through a wide area measurement system; judging whether the power system is faulty or not, if so, selecting the bus node with the fastest voltage drop as an observation point; selecting the two units with the largest power angle difference, and calculating the electrical distance from the observation points to the two units respectively; according to the historical data of observation point voltage, predicting the future voltage; and judging whether the power angle instability occurs or not according to the relationship between the minimum value of the voltage at the observation point and the electrical distance. The invention does not need to carry out fast clustering of generators, does not need to calculate the center of inertia of a system, and can judge the transient stability of any pendulum of a power system in real-time and on-line.

Description

technical field [0001] The invention relates to a transient stability identification method based on voltage trajectory characteristics, belonging to the technical field of power system stability. Background technique [0002] The development of modern power systems into large-scale regional interconnection grids can bring huge economic benefits, but it also complicates the problem of transient stability. Transient instability remains one of the greatest threats to modern power systems. Effective real-time transient stability prediction and emergency control are crucial. The traditional transient stability control strategy mainly adopts the control method of "offline formulation of strategy table and real-time matching". However, there are some deviations in the system model and parameters, which affect the accuracy of the calculation results. At present, the commonly used transient stability analysis methods are time-domain simulation, direct method based on Lyapunov ene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 孙应毕刘志坚宋琪
Owner KUNMING UNIV OF SCI & TECH
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