Power System Complicated Fault Transient Stability Analysis Using Object-Oriented Technique

With the continuously progress of power system automation level, the software scale is more and more huge. The power system internet applications developed with the traditional program design method is faced with increasingly outstanding difficulty of maintaining and enhancing. Increasingly mature Object-Oriented Technique (OOT) has solved successfully the problem at the beginning of 90's in 20 centuries, witch making the Object-Oriented Technique gradually applied to power system software development. The thesis has mainly researched that Object-Oriented Technique isapplied to the software development of transient stability.The analysis of stability has the very important meaning to the security and reliability of power system running. The mass problem needed analyze is transient stability of simply fault. But in recent years, for making use of digital computer to research the stability of power system running in various faults state and action circumstance of fast relay protected device, the analysis to power system complicated faults is increasingly imminent.At carry on the complicated fault transient stability analysis, using the network transformation principle, the comprehensive resistance concept of simple dissymmetry fault is expanded for the comprehensive resistance matrix of the arbitrarily complicated fault. Thus processing complicated fault can be conversed for similar to simply fault, which the comprehensive resistance matrix is merged into the positive network. So the calculation procedure is simplified.Based on the transient stability calculation model established with Object-Oriented thought, an Object-Orientedcomplicated fault transient stability calculation package is developed, using VC++ program language. Both complicated and simple model of complicated fault transient stability analysis are integrated in the software, applying the model of each component to different degree of precision respectively. Joined with the power system diagram editor, the complicated fault transient stability calculation can be carried out in a graphical way.To the breakdown on the wire of single-phase connecting with the ground, this thesis increased the constitution of the auto switch and the protection actions, which make this calculation system be able to imitate more effectively.This thesis carries out two kinds of result output including the text output and the swing output. The changed swing of each generator's rotor angle and relatively rotor angle between arbitrary two generators can be conveniently shown and printed, which make the whole calculation process of transient stability more visual.This thesis consummate the transient stability calculationby considering the protection action on the wire. At the same time, this thesis has increased the function of complicated fault transient stability calculation obtained the verification of the BPA and realized the graphic output. According to the test of a given system, the whole software is proved to have the characteristics of precise calculation and convenient operation, which has good practicability. At the same time, this thesis further proves the immense potentiality of the application of OOT in the development of power system software.