Dynamic Analysis Of The N-l Power Flow Calculation

With the constant expansion of power system scale,the power system isdeveloping to the direction of big unit,great power,high voltage and long-distancetransmission. The static security issues of power system are also increasinglyprominent. Breaking static grid simulation is an important part of safety analysis.Studying the issue of breaking static grid simulation and proposing a fast and efficientoutage-simulation algorithm have very important practical significance.The Taylor expansion method based on sensitivity analysis,as a simple, intuitionand practical method in the study of voltage stability,has been favored by manyscholars. This paper studies the dynamic analysis of the N-1power flow calculationbased on the Taylor expansion and the constraint condition of inject node power.The Taylor series of the current with respect to branch outage parameter can becalculated by using the relations between network parameter,based on tthe constraintcondition of inject node power,the function of the branch-outage voltage was obtainedby calculating the average compensation as the correction of Taylor expansion.Usingthe current and voltage Taylor,we first put forward that the system control variables(branch outage parameter) can be denote by the system state variables by the Taylorfunction. Then power network problem can be solved by mathematics equation,,we canwork out the certain correction of the branch-outage voltage,The theoretical analysisshows that this algorithm is reasonable, but needed to be further research andimprovement.Further,Based on the voltage’s Taylor series about branch outageparameter, the1order derivatives of the branch-outage voltage amplitude value can becalculated.,it can clearly reveal the weak point of the N-1system and analyze the staticsecuriy.Through the simulation analysis to IEEE standard system,two kinds of algorithmin dealing with issues on branch breaking and generator breaking have both advantagesand disadvantages..The voltage sensitivity index can efficiently analyze the voltagestability of the N-1power system. It is of high credibility and has great practicalprospects.