Simulation of the Integrated Power Supply (IPS) Technology

Abstract

The paper presents a new type topological structure for the IPS, which materializes the integrated design of inverter, battery charger and emergency power supply (EPS). The IPS is composed of a DC-AC inverter and a bi-directional AC-DC converter. When the IPS works normally, the bi-directional AC-DC converter works as a battery charger in the rectified of three phase PWM state; when the IPS fails, the bi-directional AC-DC converter works in the three phase PWM inverter as EPS. The simulation experimental results have proved the correctness and feasibility of the topological structure and the control strategies of the main circuit. Introduction The integrated power supply (IPS) system comprises inverter (abbr. SIV), battery charger and EPS etc as the core components for power transformation management and operation control as well as other auxiliary equipment. The SIV is a key part of the rail vehicle as the power supply for the air compressor of the braking system, the cooling fan of the main circuit system and the electricity load such as the air-conditioner set, the electric heater and the floodlight etc on the vehicle. The battery charger recharges the car batteries with direct current (DC) and functions as the power supply together with the storage battery for the control circuit and the basic DC floodlight for all the vehicle systems. The IPS system is an indispensable part of the urban rail vehicle (URV) that realizes numerous pivotal functions of it. It guarantees the reliable operation of the main circuit system of the vehicle and has a bearing on the comfort of passengers in the vehicle. Consequently, top priorities should be attached to its design. The paper presents a new type IPS integrating SIV, battery charger and EPS which can share the DC storage batteries and realize the uniform control and monitoring of the IPS system. The IPS of the URV comprises a DC-AC main inverter and a bi-directional AC-DC converter. There into, the DC-AC main inverter adopts the topological structure of three phase six switch main circuit which directly inverts the input DC voltage, followed by output by power frequency transformer isolation. [1-4] After that, the stable three phase four-wire 380V power supply and the single phase 220V power supply are achieved. The bi-directional AC-DC converter also applies the topological structure of three phase six switch main circuit which can materialize bi-directional energy conversion. When the power supply system runs normally, the bi-directional AC-DC converter works in the rectified three phase PWM state as the battery charger, supplying vehicles with DC110V power and recharging the storage batteries. When the power supply fails, the bi-directional AC-DC converter is applied as the EPS and runs in the inverted three phase PWM state, converting the electric energy stored in the storage battery into the three phase AC to maintain normal operation of the air conditioners and the ventilation system so as to guarantee the personal health and safety of the passengers. The new type vehicle-mounted IPS reduces the allocation of equipment, storage batteries and testing equipment, enhances the reliability of the equipment and the standards of data sharing and system analysis, improves the working efficiency and the economical efficiency of operation management and boasts great potentials for future market development. Topological Structure of Main Circuit International Conference on Information Sciences, Machinery, Materials and Energy (ICISMME 2015) © 2015. The authors Published by Atlantis Press 639 The new type IPS is the power supply system integrating SIV, battery charger and EPS, primarily composed of the main inverter and the bi-directional AC-DC converter. The structure of the main circuit is demonstrated in Fig. 1. bi-directional AC-DC converter main inverter battery charger