Multi-target comprehensive control energy-saving device for subway power supply system

Abstract

A multi-object comprehensive control energy conservation device of a subway power supply system adopts a plurality of AC / DC converter modules with the controllable high power factor rectification to replace the conventional rectification circuit, so as to realize the bidirectional energy flow and effectively suppress the harmonic wave of the device by utilizing the high power factor rectification technique, wherein the plurality of AC / DC converter modules are further connected in parallel, so as to expand the capacity of the entire device. At the same time, one or more DC / DC converter modules which are connected in parallel are arranged at the part of the DC traction bus, so that the electric energy generated during the braking process of the train can be partially fed back to the electric network through the AC / DC converter module, and part of the electric energy can be stored in the independent condenser bank through the pressure boost of the DC / DC converter module. The device can fully recover and utilize the braking energy and overcome the shock to the electric network caused by the energy fed back instantaneously through part of the absorbed energy and the feedback energy.

Description

technical field [0001] The invention relates to a multi-objective comprehensive control energy-saving device, which is an energy-saving device applied to a subway power supply system. It belongs to the field of power electronics and electric drive technology. Background technique [0002] Energy conservation is a basic national policy of our country and an important content of the sustainable development strategy of the national economy. In recent years, my country's economy has developed rapidly, and traffic congestion has become an obstacle to urban development. In major cities, it is imperative to develop and build a rapid rail transit system network. At present, 15 cities in my country are applying for the construction of subways and light rail lines. The total length of the lines exceeds 430 kilometers, and the construction investment is about 140 billion yuan. By 2025, more than 30 large and medium-sized cities in my country will have built subway transportation net...

AI Technical Summary

Problems solved by technology

These technologies have certain practical value, but the energy storage element of the flywheel energy storage type braking technology is a flywheel motor. Since the flywheel is in a high-speed rotation state for a long time, and the mass of the flywheel is large, the problem of frictional energy consumption is serious, and the working life of the flywheel is short.

However, the absorption equipment of the existing capacitive energy storage braking technology must release and consume the electric energy on the capacitor every time it stores full electric energy, otherwise the next working capacitor cannot absorb the braking energy

These defects limit the further improvement of energy-saving effect to a certain extent

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