Performance analysis of a hybrid power system with three phase interleaved bidirectional converter

A utility interface converter is one of the key components in the hybrid power systems. This Paper addresses a novel three phase interleaved bi directional power converter circuit for economical solar, wind & battery hybrid power system (HPS). HPS consists of both AC and DC networks connected together by three phase interleaved bi directional converter in combination with 3phase pulse width modulation controlled converter. Here PWM controlled converter switches are used for smooth power transfer between AC and DC links and to maintain stable operation with various renewable sources (Both AC and DC), different loads. The addressed hybrid architecture is very flexible to decrease the required power conversions stages and hence the system cost and efficiency. The HPS is simulated in MATLAB/Simulink Environment and the simulation results show that the system can maintain stable operation with three phase interleaved bi directional converter both in the grid tied, autonomous modes.

I. Introduction

THE energy generation, transmission and distribution model that exists today is the same one that has been placed for the last 60 years and or so. The electrical power system still deploys the unidirectional transmission infrastructure. With the growing penetration of distributed generation energy flows could be bidirectional on a bus feeder. The power electronics engineers focus more on the design for a specific load or source rather than considering the system requirement. The bus-interface bi-directional converter system however requires the power electronics engineers to step out of their familiar zone and embrace more challenges in the whole energy and system sector [1]. Therefore, many technology challenges lie in a highly reliable and efficient converter topology design and the advanced control architecture capable of adjusting the terminal characteristics and responding to diverse system dynamics as well. Bidirectional power flows from high voltage dc bus to low voltage battery when the battery is being charged and from low voltage battery to high voltage dc bus when the battery is supplying power in renewable energy systems, a bidirectional dc-dc converter is used as a voltage regulator when the power is being transferred to high voltage dc bus while charging the capacitive energy source when the power is being transferred from high voltage dc bus to low voltage side. In hybrid electric vehicles, bidirectional power flows from low voltage battery to high voltage dc bus during acceleration and from high voltage dc bus to low voltage battery during regenerative braking.