Equivalent Model of the Thyristor-Type Inter-Connector for Multi-Time Scale Transform
Zhang Chunpeng, Jiang Qirong, Zhao Zhengming
State Key Laboratory of Control and Simulation of Power System and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing 100084 China
Abstract：Flexible interconnection of power grids draws more and more attention. The novel inter-connector based on thyristor-controlled zigzag transformer can be applied to the interconnection of synchronous power grids, closed-loop operation of distribution networks, flexibly opening electromagnetic loop, etc. The Thevenin equivalent model of its primary circuit with large time-scale is developed and the self-tuned interpolation algorithm is adopted, guaranteeing the simulation accuracy with relatively large simulating step. Simulation models based on devices and equivalent model are both developed for multi-timescale transform. The effectiveness of the flexible interconnector as well as correctness of the equivalent model is validated. Simulations are implemented by the steps of 50μs and 300μs, respectively, using the two kinds of models. It is demonstrated that the proposed equivalent model shows satisfied accuracy under both steps. The simulation time consumptions are around 14.5% and 10.3% of the device-based simulation model, approving a sharply decreased computation.
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2017, Vol. 32 
