Discrimination method for power system transient stability based on phase trajectory and relative kinetic energy change rate
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A transient stability, power system technology, applied in circuit devices, AC network circuits, reducing/preventing power oscillations, etc., can solve problems such as low accuracy
Active Publication Date: 2021-03-02
KUNMING UNIV OF SCI & TECH
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[0005] The present invention provides a power system transient stability judgment method based on phase trajectory and relative kinetic energy change rate, aiming at the problem of low precision in the existing method of using phase trajectory characteristics to judge power system transient stability
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Embodiment 1
[0062] Embodiment 1: as Figure 1-10 As shown, the power system transient stability discrimination method based on phase trajectory and relative kinetic energy change rate, the specific steps of the discrimination method are as follows:
[0063] Step S1. At time t, collect the power angle δ of the i-th generator in the power system in real time through the WAMS system i , Angular velocity Δω i , Electromagnetic power P ei , mechanical power P mi , i=1, 2, 3...n, n is the number of all generators in the power system;
[0064] Step S2. According to the generator information extracted in step S1, judge whether there is a fault in the power system. If there is no fault, return to step S1. If there is a fault, sort all generators according to the power angle from large to small, and calculate the adjacent two The power angle difference of each unit is selected, and the two generator sets corresponding to the largest power angle difference are selected as the dividing line. The ...
Embodiment 2
[0093] Embodiment 2: as Figure 1-10 As shown, the power system transient stability discrimination method based on phase trajectory and relative kinetic energy change rate,
[0094] 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 same fault duration is different on the IEEE10 machine 39 node system, and the calculation step size is 0.01s, E for generator q 'Model, load with constant load model. The parameters such as power angle, mechanical power, angular velocity and electromagnetic power of the generator obtained through simulation calculation are used as the corresponding measurement input, and a MATLAB program is written to analyze and calculate the data.
[0095] Case 1
[0096] Set fault 1 as a three-phase ground short circuit between busbars 4 and 14. After 0.2s, the fault disappears, and the system will be in...
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Abstract
The invention relates to a power system transient stability discrimination method based on a phase trajectory and a relative kinetic energy change rate. The power system transient stability discrimination method comprises the steps of: acquiring information of a generator set in a power system at one moment; then judging whether the power system fails or not, and if so, equating the whole set witha single generator; calculating a phase trajectory concavity and convexity index of the equivalent single generator, and judging the stability of the system according to the index; calculating the relative kinetic energy change rate of the system, performing derivation on the relative kinetic energy change rate, regarding a first derivative as an auxiliary criterion for transient instability, andjudging whether the system is in transient instability according to the auxiliary criterion; and if the auxiliary criterion for transient instability is not met, judging transient stability of the system through judging whether the system reaches an unstable equilibrium point, acquiring generator set information at a next moment if the system does not reach the unstable equilibrium point, and cycling the above steps to judge the transient stability of the system. The power system transient stability discrimination method comprehensively applies the phase trajectory concave and convexity and the relative kinetic energy change rate criteria, and can judge the transient stability of a multi-generator system accurately, quickly and timely.
Description
technical field [0001] The invention relates to a power system transient stability judgment method based on phase trajectory and relative kinetic energy change rate, and belongs to the technical field of power system operation. 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, dire...
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