HPF boost interleaved operating in discontinuous conduction mode for trolleybus application

This paper deals with results of a research and development (R&D) project in cooperation with Electric Power Distribution Company in São Paulo (Brazil) regarding the development and experimental analysis of a new concept of power drive system suitable for application in traction systems of electrical vehicles pulled by electrical motors, which can be powered by urban DC or AC distribution networks. The proposed front-end structure is composed by five boost power cells in interleaving connection, operating in discontinuous conduction mode as AC-DC converter, or as DC-DC converter, in order to provide the proper DC output voltage range required by DC or AC adjustable speed drivers. Therefore, when supplied by single-phase AC distribution networks, and operating as AC-DC converter, it is capable to provide high power factor, reduced harmonic distortion in the input current, complying with the restrictions imposed by the IEC 61000-3-4 standards resulting in significant improvements for the trolleybuses systems efficiency and for the urban distribution network costs. Considering the compliance with input current restrictions imposed by IEC 61000-3-4 standards, two digital control strategies were evaluated. The digital controller has been implemented using a low cost FPGA (XC3S200) and developed totally using a hardware description language VHDL and fixed point arithmetic. Experimental results from a 15 kW low power scale prototype operating in DC and AC conditions are presented, in order to verify the feasibility and performance of the proposed system. © 2009 IEEE.

Keywords

Interleaved converter, Power factor correction, Power supply, Trolleybus, AC conditions, Ac-dc converters, Adjustable speed, Digital control, Digital controllers, Discontinuous conduction mode, Distribution network, Electric power, Electrical motors, Electrical vehicles, Experimental analysis, Fixed point arithmetic, Front-end structures, Hardware description languages, High power factor, Input current, Interleaved converters, Low costs, Low Power, New concept, Output-voltage ranges, Power cells, Power drives, Power factor corrections, Research and development, Traction systems, Urban distribution, Automobile electronic equipment, Computer hardware description languages, Cost reduction, Digital control systems, Distributed parameter networks, Electric load flow, Electric network analysis, Electric power distribution, Electric power factor, Electric power transmission, Electric traction, HVDC power transmission, Power converters, Power electronics, Regulatory compliance, DC motors