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APPLICATIONS OF MATLAB IN SCIENCE AND ENGINEERING - PART 4

Một phương pháp dòng điện tiếp tục được trình bày bởi (Hiroyuki Mori, 2007) với dự đoán tuyến tính và phi tuyến dựa trên phương pháp Newton-GMRES để giảm thời gian tính toán của các phương pháp lai thông thường. | 148 Applications of MATLAB in Science and Engineering Krylov subspace was used by Adam 1996 method as iterative method for the practical solution of the load flow problem. The approach developed was called the Kylov Subspace Power Flow KSPF . A continuation power flow method was presented by Hiroyuki Mori 2007 with the linear and nonlinear predictor based Newton-GMRES method to reduce computational time of the conventional hybrid method. This method used the preconditioned iterative method to solve the sets of linear equations in the N-R corrector. The conventional methods used the direct methods such as the LU factorization. However they are not efficient for a large-scaled sparse matrix because of the occurrence of the fill-in elements. On the other hand the iterative methods are also more efficient if the condition number of the coefficient matrix in better. They employed generalized minimum residual GMRES method that is one of the Krylov subspace methods for solving a set of linear equations with a non symmetrical coefficient matrix. Their result shows Newton GMRES method has a good performance on the convergence characteristics in comparison with other iterative methods and is suitable for the continuation power flow method. 2. ATC computation 2.1 Introduction Transfer capability of a transmission system is a measure of unutilized capability of the system at a given time and depends on a number of factors such as the system generation dispatch system load level load distribution in network power transfer between areas and the limit imposed on the transmission network due to thermal voltage and stability considerations Gnanadass Manivannan Palanivelu 2003 . In other words ATC is a measure of the megawatt capability of the system over and above already committed uses. IOS 400 MW 20S 200MW 10S 400MW 20S 200 MW 200 MW 200MW 200 MW 200 MW a Without Transfer Limitation b With Transfer Limitation Fig. 2.1. Power Transfer Capability between Two Buses To illustrate the