Abstract
This paper presents a Scott transformer model to be applied in electromagnetic transients (EMT) programs, particularly in the absence of a detailed Scott transformer model for performing real-time simulations (RTS). Regarding a Scott transformer, a common topology for converting a three-phase network into two single-phase networks, the transformer model in EMT programs is essential to simulate large-scale electric railway systems. A code-based model has been developed to simulate the transformer in RTS directly and contain the transformer’s actual impedance characteristics. By establishing a mathematical foundation with the current injection method, we presented a matrix representation in conjunction with a network solution of EMT programs. The proposed model can handle more practical parameters of Scott transformers with a relatively low computational load. Thus, it supports the flexible computation of real-time simulators with a finite number of processor units. The accuracy of the model is verified by simulating it and comparing the simulation results with an industrial transformer’s certified performance. Furthermore, a case study involving a comparison of the results with the field measurement data of an actual Korean railway system demonstrated the efficacy of the model.
Highlights
As electric railway systems have been widely employed around the world, various concerns regarding electric power systems have emerged
We formed a Scott transformer by connecting two transformer models in the RSCAD Substep library in the same way as previously mentioned. When it comes to real-time simulations (RTS) for electric railway systems, it should be noted that the railway system components, including power electronics-based apparatus and moving loads, require heavier computational resources
A precise Scott transformer model with a lighter computational burden is presented in this paper
Summary
As electric railway systems have been widely employed around the world, various concerns regarding electric power systems have emerged. Due to the incomplete model, voltage and current unbalance problems were repeatedly observed in RTS To address this concern, we formed a Scott transformer by connecting two transformer models in the RSCAD Substep library in the same way as previously mentioned. We formed a Scott transformer by connecting two transformer models in the RSCAD Substep library in the same way as previously mentioned When it comes to RTS for electric railway systems, it should be noted that the railway system components, including power electronics-based apparatus and moving loads, require heavier computational resources. Embodying the Scott transformer in EMT programs (rather than two transformer models); Addressing the detailed impedance characteristics of the Scott transformer, including the leakage reactance of M- and T-phases; Facilitating flexible computation in terms of real-time simulation of large-scale systems owing to the lighter computational burden of the proposed model. The efficacy of the model is demonstrated by comparing it with field data of an actual Korean railway system
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