Fully-controlled same-phase power supply system

Abstract

The embodiment of the invention provides a fully-controlled same-phase power supply system. The fully-controlled same-phase power supply system comprises a three-phase multi-winding split power transformer, a converter module and a single-phase three-winding boost transformer, wherein three iron core columns of the three-phase multi-winding split power transformer are all provided with n same low-voltage coils to form n three-phase low-voltage windings, the converter module comprises n power units which are cascaded, each power unit comprises a rectification unit, an energy storage filtering unit and an inversion unit which are sequentially connected, the three-phase low-voltage windings are inputs of the rectification filters, outputs of the inversion units are cascaded and then are output after boosting of the single-phase three-winding boost transformer, and the devices employed by the power units are mainly fully-controlled power electronic devices. The fully-controlled same-phasepower supply system provided by the embodiment of the invention, three-phase / single-phase conversion can be achieved by the fully-controlled power electronic device, the problems of negative sequence,harmonics, power factors, electric phase split and the like in the power system can be solved, and the electric energy loss also can be reduced.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of power electronics, and in particular to a fully-controlled in-phase power supply system. Background technique [0002] At present, the active electric locomotives of my country's electrified railways mainly adopt two types of models: "AC-DC" and "AC-DC-AC". The advantages of electric locomotives, such as high power, high efficiency, strong overload capacity, fast acceleration and deceleration, high running speed, and strong climbing ability, have enabled the rapid development of electrified railways in recent years. However, the nonlinearity and asymmetry of locomotive loads , impact and other characteristics still bring many problems to the electrified railway, such as: [0003] The traction load of electric locomotives uses single-phase power frequency AC power supply, which destroys the symmetrical condition of the power system. When the three-phase power system supplies power to...

AI Technical Summary

Problems solved by technology

The electric separation phase is the non-electric section of the electrified railway, and the train slides through this section, which causes the pantograph of the locomotive to fail to receive current continuously, the traction force is lost, and the train loses speed, which is not conducive to the operation of high-speed and heavy-duty trains.

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