Based On The Dq0Coordinate System Of Electric Power System Fault Modeling Research

The paper proposed based on dq0coordinate system, the mathematical model of thepower system need to establish fault simulation.Dq0coordinate system is based on parktransformation form, set the reference frame on the rotor coordinate system that is used toanalyze early synchronous motor matrix differential equations with time-varyingcoefficients. After Park transformation, self and mutual inductances of the stator and rotorwindings, not change with the change of the position of the rotor.Dq0three groups ofvariables are related, or decoupled from each other.By park transformation after all mutualinductance is reversible.In dq0coordinate system, the flux linkage equations becomeconstant coefficient equation, which makes the mathematical model of dynamiccomponents of constant coefficient differential equation.In this paper, based on dq0coordinate system to develop a mathematical model of the basic element of the electric powersystem, the standard model under the power line fault and the standardization of electricpower line fault model, the simulation validation results show that the accuracy andfeasibility of the method. Concrete in the research is embodied in several aspects:(1)Developed a mathematical model based on dq0coordinate system of the basiccomponents of the power system, such as the mathematical model of the synchronousmachine system, the mathematical model of the transformer, power line, and themathematical model of power load, the model can reflect the actual power system to runthe physical elements of the actual working process, has the universality and applicability.(2)Developed a mathematical model based on dq0coordinate system the singletfailure of the power system failure,and deduced the failure of the non-standard model andthe standard model,for non standardization model, this paper presents a modified triaxialadmittance matrix method of structure and standardized model is just the parameters of themodified triaxial admittance matrix, instead of three axis admittance matrix structure,improve the system fault simulation computation speed.(3)This paper developed a mathematical model power system components andmathematical model of failure with a single machine infinite system for working conditionof the steady state validation, and three machines nine nodes system fault simulationcalculation of the power system transient stability analysis, accurate qualitative andfeasibility is verified.