Computing And Analyzing The Boundary Of Power System Feasible Region Based On The Optimization Method

In power system security and stability analysis, the “region-wised” method hasbeen attracted a lot of attention and has been applied to some power companies inrecent years. In this thesis, power-flow based feasible region (PFBFR) has been deeplystudied. PFBFR is important to evaluated power system steady-state stability since itgives its stable operating area, which is very useful for power system operators.Continuation power flow (CPF) is usually used to determine the boundary of PFBFR,however, its results may have some conservativeness given by some assumptions inthe method. In this thesis, we want to reduce the conservativeness of PFBFR throughimproving the calculation method. Main work of this thesis is as follows：1. Procedure of computing method for PFBFR based on CPF method is firstreviewed and analyzed. Reason of conservativeness of the method is discussed.2. An improved method to precisely determine power system PFBFR is given. Itcan consider lots of power system operating constraints. And the boundary of PFBFRis determined through an optimization procedure. The yielded result is unique and isindependent to the system data. Then, grid iteration method is used to illustrate thelow dimension diagrams of power system PFBFR in two or three dimensions.3. WSCC9-bus power system is selected to validate and illustrate the givenmethod. Impacts of different operating constraints on PFBFR’s boundary are deeplydiscussed.4. Finally，the given method is extended to analyze the “one-dimensional”problem in order to determine the transfer capability of power interfaces. IEEE30-bussystem is used to validate the given method.