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A Transient Stability Identification Method Based on Voltage Trajectory Characteristics

A technology of transient stability and identification method, which is applied in the direction of electrical components, circuit devices, AC network circuits, etc., and can solve problems such as system model and parameter deviation, and affecting the accuracy of calculation results

Active Publication Date: 2021-08-20
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 the power system has a fault, 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 time throu...

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 wide-area measurement system is used to collect the information of the busbar nodes in the power system at a certain moment; to judge whether the power system is faulty, and if a fault occurs, select the busbar node with the fastest voltage drop as the observation point; select the two generators with the largest power angle difference According to the historical data of the voltage of the observation point, predict the future voltage; according to the relationship between the minimum value of the voltage of the observation point and the electrical distance to judge whether the system has power angle instability . The invention does not need to perform fast grouping of generators, does not need to calculate the center of inertia of the system, and can judge the transient stability problem of the random swing of the power system online in real time.

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 Patents(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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