Experimental Identification of the Optimal Current Vectors for a Permanent-Magnet Synchronous Machine in Wave Energy Converters

Simon Krüner and Christoph M. Hackl
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Simon Krüner: Graduate School of the Munich School of Engineering (MSE), Technical University of Munich (TUM) and SINN Power GmbH, Garching 85748, Germany
Christoph M. Hackl: Department of Electrical Engineering and Information Technology, Munich University of Applied Sciences (MUAS) and MSE-Research Group “Control of Renewable Energy Systems”, Technical University of Munich (TUM), Munich 80335, Germany

Energies, 2019, vol. 12, issue 5, 1-18

Abstract: This paper investigates efficiency enhancements in Permanent-Magnet Synchronous Machines (PMSMs) used as generators in wave energy converters. A method is presented, which allows experimental identification of the optimal current vectors leading to minimal losses and maximum efficiency. Iron and inverter losses are considered. The proposed identification method is generic and is applicable to any PMSM used as a generator. The obtained results are compared to the well-known Maximum Torque per Current (MTPC) strategy. Two MTPC strategies are investigated: (i) MTPC using linearised flux linkages; and (ii) MTPC using measured, nonlinear flux linkages. For both MTPC strategies, the influence of the Voltage Source Inverter (VSI) is taken into account. All measurements are performed on a simple and cheap industrial-like test bench. All three presented methods lead to increased efficiency. The best efficiency is obtained by the proposed maximum efficiency strategy, where iron and inverter losses are taken into account by proper measurement of the optimal current vectors.

Keywords: permanent-magnet synchronous machine; maximum torque per current; optimal control; maximum efficiency; loss minimization; flux linkage measurement; generator operation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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