A Comparative Study of Compensation Capacities of using Railway Power Conditioner and Steinmetz Compensator in Traction Substation with V/V Transformer
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Abstract
This paper presents the comparative study of using two different compensators in a railway traction substation with a V/V transformer to alleviate voltage unbalance and low power factor in a railway power supply system: railway power conditioner (RPC) and Steinmetz compensator. The paper also introduces mathematical models and a calculation method for searching optimal rating of both compensators. One computer simulation study case under the worst case of loading condition was used to validate the proposed models and method. The simulation results showed that the Steinmetz compensator had approximately 30 percent less optimal capacity than that of RPC and had better capability of substation voltage regulation under the same compensation target, voltage unbalance factor of less than 2%, and power factor of greater or equal to 0.95. Consequently, the installation of Steinmetz compensator could result in less compensator cost, with a capacity solely taken into consideration.
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