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Apparatus and method taking parameter time variation into consideration for assessing transient stability of electric system

An evaluation device, time-varying technology, applied in circuit devices, electrical components, AC network circuits, etc., can solve problems such as affecting the results of calculations, lack of qualitative and stable identification criteria, and errors in results

Inactive Publication Date: 2013-01-16
XI AN JIAOTONG UNIV +3
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Problems solved by technology

Its inherent defect is the lack of qualitative stability identification criteria in engineering, and only limited observation time and sufficient threshold value can be used as the criteria for system stability
In addition, it is completely dependent on the model and parameters of the components. When the model or parameters are not completely accurate, the results must have errors
[0004] The direct method is a strictly quantitative transient stability analysis method, which can give the transient stability limit of the system based on the sensitivity method, but the calculation of the transient energy is limited by the model, and the error of the energy function used will affect the calculation results
In addition, the direct method is only suitable for analyzing the stability of the first pendulum in the power system, which has certain limitations

Method used

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  • Apparatus and method taking parameter time variation into consideration for assessing transient stability of electric system
  • Apparatus and method taking parameter time variation into consideration for assessing transient stability of electric system
  • Apparatus and method taking parameter time variation into consideration for assessing transient stability of electric system

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Embodiment

[0052] right figure 2 The shown stand-alone infinite system is simulated, and the fault removal time is set to 0.114s and 0.115s respectively.

[0053] image 3 It is the corresponding trajectory curve and instability index curve when the fault is removed in 0.114s. Depend on image 3 (c) It can be seen that although the indicators τ and μ are greater than zero at the same time at 0.48s, if the influence of time-varying parameters is not considered, it will be concluded that the system will lose stability. After considering the time-varying parameters, the parameter time-varying index ε·Δω<0 at this moment indicates that the parameter changes are conducive to the restoration of stability of the system, so that the judgment of system instability will not be made, which is consistent with the simulation results.

[0054] Figure 4 It is the corresponding trajectory curve and instability index curve when the fault is removed in 0.115s. Depend on Figure 4 (c) It can be see...

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Abstract

The invention discloses an apparatus and method taking a parameter time variation into consideration for assessing a transient stability of an electric system; the method comprises the steps as follows: implementing filtering and normalization data treatment on response information of a wide area measurement system (WAMS) actual measurement generator by a data pre-processing module; transmitting the data to an angular velocity-power angle phase plane analyzing module; calculating a concavity-convexity index tau of an angular velocity-power angle phase plane of the generator by the angular velocity-power angle phase plane analyzing module; transmitting the data to a following unbalance power-power angle phase plane analyzing module only when the tau is more than 0, and calculating a concavity-convexity index mu reflecting the unbalance power-power angle phase plane of the generator; transmitting the data to a final parameter time variation impact assessing module only when the tau is more than 0, and calculating a time variation parameter Y (ti) of an equivalent system; calculating an index sigma of the parameter time variation impact; judging that the system is to lose the transient stability only when the tau, the mu and the sigma.delta omega are all more than 0. According to the method, the transient stability of the electric system can be rapidly identified in real time, to provide a necessary evidence for the adoption of an emergency control measure.

Description

technical field [0001] The invention relates to the technical field of transient stability evaluation of power systems, in particular to a power system transient stability evaluation device and method considering time-varying parameters. Background technique [0002] The analysis and judgment of power system transient stability is one of the classic problems in power system research. So far, there are four main types of analysis methods for studying transient stability problems, namely numerical integration method, direct method, hybrid analysis method and stability analysis method based on trajectory information. [0003] Numerical integration method is the basic method of power system transient stability analysis, it can adapt to various mathematical models of detailed components, and the analysis results are accurate and reliable. Its inherent defect is the lack of qualitative stability identification criteria in engineering, and only limited observation time and suffici...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
Inventor 张保会郝治国吴丽华王青马世英李晓珺胡雪凯
Owner XI AN JIAOTONG UNIV
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