The Study Of The Distributive Parallel Simulation Of The Transient Stability Of Power System

Currently, the characters of modern power system are regional interconnection and market-orientation, which improves the share of electrical resource, meanwhile, increase the difficulty of system to operate securely and stably. It is a hot topic that how to realize the on line real-time simulation for the large-scale and complicated power system. The serial simulation for the whole power network can not achieve the goal of real-time simulation. In recent years, the appearance of high performance PC-Cluster platform and parallel arithmetic brings hope to realize the aim.Firstly, an inexact Newton method based on factorization preconditioned GMRES (General Minimal Residual) is proposed to apply to transient simulation. The method adopts Newton-GMRES arithmetic's inner and outer iteration to solve the differential-algebraic equations which represent the transient process of system. When solving Jacobian equation each step of simulation, the method utilizes ILU factorization to precondition on the coefficient matrix, and then form the equivalent equation which is solved by GMRES arithmetic. The method makes use of dishonest Newton strategy to speed up the simulation. The main idea of dishonest Newton strategy is: update the Jacobian matrix only when the number of Newton iteration is excessive, otherwise, keep the Jacobian constant. In addition, as the most calculation of GMRES method is vector formulation, it is easy to implement through parallel processing. The test results show that the new method is effective.Secondly, the communication based on MPI is researched in this thesis. The basic concept and communication modes of MPI are introduced in brief. The modes of communication include point to point and collective. The blocking and non-blocking which belong to point to point communication are compared in detail.Communication and calculation to be carried out at the same time is the character of non-blocking communication, which is utilized to realize the asynchronous communication strategy in this thesis.Finally, the parallel simulation of electromechanical transient is researched and an asynchronous parallel method based on equivalence is proposed to apply to this field. The general idea of this method is: The network is divided into several interconnected subsystem, there are process of equivalence amongst subsystems every step. In each step, a subsystem utilizes the equivalent information received from other subsystems to calculate independently until convergence. In the process of equivalent information's transfer, the asynchronous strategy is used, which can monitor and utilize new equivalent information in order to speed up the convergence of iteration. The results of samples demonstrate that not only the equivalence of new method is accurate enough but also the speed and efficiency of calculate are advanced. To some large-scale real systems, the on-line simulation will be realized.The achievements of this thesis enrich the parallel simulation methods of power system electromechanical transient and improve the utility progress of that.