Abstract
Power quality and neutral section are two technical problems that hinder the development of electrified railway to high-speed and heavy railway. The co-phase power supply technology is one of the best ways to solve these two technical problems. At present, a V type connection traction transformer is widely used in a power frequency single-phase AC traction power supply system, especially in high-speed railway. In this paper, a new type of co-phase power supply system for electrified railway based on V type connection traction transformer is proposed. One single-phase winding in the V type connection traction transformer is used as main power supply channel, and three ports are used as compensation ports. Neutral section is no longer set with traction substation, and the train is continuously powered through. The independent single-phase Static Var Generators (SVGs) are used to compensate the three-phase imbalance caused by single-phase traction load. When necessary, the power factor can be improved at the same time. The principle, structure, control strategy, and capacity configuration of the technical scheme are analyzed in this paper, and the effectiveness of the scheme is verified by using the measured data of electrified railway. The advantage of this scheme lies in the universal applicability of the V type connection traction transformer, and the flexibility of the SVG device.
Highlights
Introduction and Leonardo SandroliniAs the backbone of modern comprehensive transportation system and one of the main modes of transportation, railway plays an important role in the process of social and economic development in China [1,2]
The feature of the scheme is that the traction load and compensation equipment share the same transformer, which can realize the comprehensive compensation of negative sequence and reactive power, effectively solve the problem of power quality, and cancel the neutral section at traction substation
By controlling the reactive power generated by Comprehensive Compensation Equipment (CCE), the reactive power and negative sequence generated by single-phase traction load are comprehensively compensated, so that the compensated power factor and negative sequence meet the requirements of the compensation target
Summary
As the backbone of modern comprehensive transportation system and one of the main modes of transportation, railway plays an important role in the process of social and economic development in China [1,2]. In Japan, Scott traction transformer and Railway Static Power Conditioner (RPC) are used in Shinkansen to compensate three-phase unbalance and voltage fluctuation so as to reduce the influence of traction load on three-phase power system [20,21,22] It can solve the problem of power quality, and automatic passing neutral section technology is used to solve the problems caused by neutral section. The practice results show that the co-phase power supply technology can effectively solve the power quality problem with negative sequence as the main factor and cancel the neutral section at the traction substation. The feature of the scheme is that the traction load and compensation equipment share the same transformer, which can realize the comprehensive compensation of negative sequence and reactive power, effectively solve the problem of power quality, and cancel the neutral section at traction substation.
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