| With wide application of power electronics apparatuses in modern power system, electromagnetic transient program(EMTP) have to face with new challenges due to high-frequent topologic sudden change caused by the action of power electronic valves. For this reason, a new interpolation algorithm for the simulation of power electronic circuits is proposed to ensure the accuracy and reliability of control system. Under the condition of global implicit trapezoidal integration, at the action point of the power electronic valve the proposed algorithm computes system variables by linear interpolation and reinitializes the control system by backward Euler method, then according to the position of the interpolation point in current simulation step the weight-numerical integration is utilized to flexibly adjust the integration step-length and the fast integration is carried out to determine the time point of the resynchronization in the simulation.The paper expounds the basic calculation process of the traditional electromagnetic transient program(EMTP) simulation. The numerical calculation problems that may appear during the switching events are analyzed in detail in this paper. Under the condition of system containing power electronic device, the modified calculation flow chart is given in this paper.The work of the paper uses Matlab programing for validation. Through comparing with mature power system digital simulation software, the algorithm proposed in this paper can well solve the numerical calculation problem that may appear during switching events. Additionally, under the premise of ensuring accuracy, the proposed algorithm can reduce the calculation burden and accelerate the computation. Both adaptability and effectiveness of the proposed algorithm are validated by case study. |
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