Based on Implicit trapezoidal integration theory, this paper proposes a mathematical model which describes the nonlinear magnetic saturated characteristics of extra and ultra voltage magnetically controlled shunt reactor(MCSR). Dynamic magnetic reluctance theory is proposed and used to decouple the magnetic functions, while inverse-hyperbolic function describing the nonlinear characteristics, Electromagnetic transient model of Equivalent reactance is established accordingly, which not only reflects the smoothly and continuously controllable features of saturated magnetic circuit avoiding the numerical oscillation of piecewise linearization, but also be suitable for the Electromagnetic simulation calculation. Computer simulation results used in standard power system example and practical operation parameters of MCSR confirmed the accuracy of model algorithm. Electromagnetic transient software of ETSDAC has contained the model by program and patented, it's novel, neat, numerical stability and practical, which not only provides the necessary implement for the real-time electromagnetic transient calculation of extra and ultra voltage magnetically controlled shunt reactor, but also opens a new way to conduct the study of nonlinear element model in real-time simulation.
Abstract. This paper mainly researches automatically optimal decoupling technology for electromagnetic transient. After making clear advantages and disadvantages and selection principles of long transmission line decoupling algorithm and node-splitting algorithm, it analyzes the influence of computing time of different elements, decoupling borders, communication between subnets, IO calls on simulation time and parallel computing efficiency. It obtains formulas of subnet execution time for different parallel simulation algorithm. It analyzed automatically optimal decoupling algorithm for electromagnetic transient in real-time simulation step size constraint which is suitable for mixing-step simulation and develops the algorithm based on ADPSS. Finally, it verifies the correctness of the algorithm through practical grid and achieves real-time simulation of the grid.
Switching function is a powerful tool for the research and performance optimization of converter, including voltage source converter, current source converter (CSI) and controlled PWM rectifier (CR). The paper proposed converter simplified model based on switching function, theory correctness compared to Matlab calculation results verified the proposed model.
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