Abstract
To solve the three-phase unbalance and reactive power problems in the electric railway power supply system, this paper proposes a Scott transformer based hypotenuse hybrid traction power system (Scott-HHPS). Compared with other co-phase traction power supply systems, the Scott-HHPS could achieve the same compensation objective with smaller active compensation capacity. The paper analyzes the basic principle and makes a comparison between the Scott-HHPS and typical co-phase power supply system. The mathematical relationships among the load current, power factor and capacity demand in condition of power factor variation and regenerative braking are analyzed. In order to further reduce the compensation capacity of the Scott-HHPS, the partial compensation strategy in respect to the index of power factor and unbalance is proposed. Besides, an instantaneous current detection method based on the theorem of conservation of power is adopted to simplify the control algorithms. Simulations and experiments are both constructed and the results demonstrate that the Scott-HHPS can effectively improve the power quality in the electric railway power supply system.
Highlights
Electric railway has been playing significant roles in region connection, freight transportation, and economic development
The above researches all demonstrate that the compensation system based on the power electronic devices is an effective solutions to power quality problems of traction power supply system, but the capital cost restrict its wide application in practice
This paper proposes a Scott-HPSS to improve the power quality of the electric railway power supply system
Summary
Electric railway has been playing significant roles in region connection, freight transportation, and economic development. The sections of phase splitting with isolation insulators seriously restrict the railway development towards high speed and heavy haul services Aiming for solving these problems, many schemes have been proposed and some were put into practice. Negative sequence compensation systems based on the three-phase voltage converter were proposed to improve the power quality of a traction substation [7], [8]. The above researches all demonstrate that the compensation system based on the power electronic devices is an effective solutions to power quality problems of traction power supply system, but the capital cost restrict its wide application in practice.
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