Power system transient stability discrimination method based on phase trajectory and relative kinetic energy change rate
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A technology of transient stability and system stability, applied in circuit devices, AC network circuits, reducing/preventing power oscillation, etc., can solve problems such as low accuracy
Active Publication Date: 2018-05-29
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
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Embodiment 1
[0062] Example 1: Such as Figure 1-10 As shown, the power system transient stability judgment method based on phase trajectory and relative kinetic energy change rate, the specific steps of the judgment method are as follows:
[0063] Step S1. At time t, collect the power angle δ of the i-th generator of 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, determine whether the power system has a fault, if there is no fault, return to step S1, if a fault occurs, sort all the generators according to the power angle from large to small, and calculate the adjacent two For the power angle difference of a unit, select the two generator units corresponding to the largest power angle difference as the dividing line. The unit above the dividing line is group S,...
Embodiment 2
[0093] Example 2: Such as Figure 1-10 As shown, the power system transient stability judgment 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 faults in different locations and different durations of the same faults on an IEEE10-machine 39-node system. The calculation step is 0.01s, E for generator q 'Model, the load uses a constant load model. The power angle, mechanical power, angular velocity and electromagnetic power of the generator obtained through the simulation calculation are used as the corresponding measurement input, and the MATLAB program is written to analyze and calculate the data.
[0095] Case 1
[0096] Set the first fault as a three-phase grounding short circuit between the busbars 4 and 14, and the fault disappears after 0.2s. The system will be in a critical ...
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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 a phase trajectory and a relative kinetic energy change rate, and belongs to the technical field of power system operation. Background technique [0002] The modern power system has developed into a large-scale regional interconnected power grid. This development can bring huge economic efficiency and at the same time make the problem of transient stability more complicated. Transient instability is still one of the biggest threats facing modern power systems. Effective real-time transient stability prediction and emergency control are essential. The traditional transient stability control strategy mainly adopts the control method of "offline formulating strategy table and real-time matching". 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 metho...
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