Research And Realization On Algorithm Of Power Equality Factors Analysis

In recent years, with the rapid development of power electronic technology and wide application of nonlinear electric equipments, the harmonic pollution is gradually serious. The power equality and the security of power system are greatly influenced. Therefore, it is necessary and important to do researches on analyzing power equality factors with current and voltage harmonics.To develop the algorithm of analyzing power equality factors, it is needed to combine the algorithm of harmonic analysis with power equality factors computing algorithm. On the basis of study on harmonics principles and features, analysis on current harmonic analysis algorithm, to solve the problems such as complex hardware design, bad expansibility, poor compatibility of precision and computing speed , the thesis does the main work as followings:Firstly, the thesis develops Newton harmonic analysis algorithm. Newton algorithm is brought in harmonic analysis model for the model can be expressed as finding roots of systems of nonlinear algebraic equations, and the prerequisite initial values of the algorithm are obtained from the popular FFT algorithm.Secondly, the thesis advances two methods to improve the Newton algorithm to satisfy different demands. Atiken accelerating convergence method is used to improve the accuracy and convergence of the Newton harmonic analysis algorithm; and Iwamoto-Tamura method is taken to accelerate the computing speed.Thirdly, the thesis realizes the analyzing of power equality factors with the help of power equality factors computing algorithm. The power equality factors computing algorithm is realized, using the results of harmonic analysis algorithm as initial values, computing power equality factors through a set of formulas.Finally, the thesis validates the algorithms above. The software of power equality factors analysis algorithm has been debugged and passed in laboratory. The practical simulating proved that theory analysis is correct. The hardware needed is simple, the real-time character and accuracy can meet the anticipation. So the project is practical and feasible.