Title: Power split strategy for hybrid power system with capacitive energy buffer

Authors: Wenguang Yan, Vadim Utkin, Giorgio Rizzoni

Addresses: Department of Electrical and Computer Engineering, Ohio State University, Columbus, OH 43210, USA. ' Department of Electrical and Computer Engineering, Ohio State University, Columbus, OH 43210, USA. ' Department of Mechanical Engineering and Center of Automotive Research, Ohio State University, Columbus, OH 43210, USA

Abstract: Propulsion systems can be hybridised by providing additional energy sources and energy conversion devices. In a Hybrid Power System (HPS), an appropriate power split strategy is important to distribute the requested power such that overall energy consumption is minimised. This paper presents the analysis and design procedure of a power split strategy of a HPS with a capacitive Energy Buffer (EB). The discussion starts with the description of properties of different components in a HPS. Then, analysis is performed to show the critical factor to design an optimal power split strategy for the HPS in which the Fuel Converter (FC) has faster dynamic response than the power request profile. Next, a power split strategy for the HPS with slow FC dynamic is developed using Pontryagin|s Minimum Principle. A numerical solver is used to obtain the solution of boundary value problem of the non-linear ordinary differential equations derived from MP. The optimisation objective is to find the tradeoff between fuel consumption and performance requirements.

Keywords: hybrid power systems; HPS; power split strategy; minimum principle; boundary value problems; capacitive energy buffers; propulsion; fuel consumption; performance requirements; fuel converters.

DOI: 10.1504/IJMIC.2008.020121

International Journal of Modelling, Identification and Control, 2008 Vol.3 No.3, pp.225 - 232

Published online: 28 Aug 2008 *

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