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Research Papers

Efficient State Reference Generation for Torque Control in Externally Excited Synchronous Machines

[+] Author and Article Information
Sabin-Constantin Carpiuc

Department of Automatic Control
and Applied Informatics,
“Gheorghe Asachi” Technical University of Iasi,
Iasi 700050, Romania
e-mail: scarpiuc@ac.tuiasi.ro

Mircea Lazar

Department of Electrical Engineering,
Eindhoven University of Technology,
Eindhoven 5600MB, The Netherlands
e-mail: m.lazar@tue.nl

Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received August 29, 2013; final manuscript received November 19, 2014; published online January 27, 2015. Assoc. Editor: Luis Alvarez.

J. Dyn. Sys., Meas., Control 137(5), 051015 (May 01, 2015) (7 pages) Paper No: DS-13-1332; doi: 10.1115/1.4029243 History: Received August 29, 2013; Revised November 19, 2014; Online January 27, 2015

A relevant challenge in hybrid electric vehicles (HEVs) and full EVs is the torque control of externally excited synchronous machines (EESMs). Effective torque control requires an efficient solution to the state reference generation problem, which is a nonlinear nonconvex optimization problem. The goal of this paper is to develop a state reference generation algorithm based on the gridding of the state and output spaces. First, an approximation defined over a cubic partition of the torque function with a piecewise affine (PWA) function is made. As a result, the state reference generation problem is reduced in each cube to solving a convex optimization problem. Moreover, this approach provides guarantees about the error bound introduced by the state reference generation procedure for the full operational state-space. To illustrate the effectiveness and robustness of the proposed algorithm, several real-time results obtained on an industrial hardware-in-the-loop (HIL) test-bench are presented. The obtained results show significant improvement compared with existing state-of-the-art reference generation methods.

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Figures

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Fig. 1

EESM d–q equivalent circuit: (a) Direct-axis equivalent circuit and (b) Quadrature-axis equivalent circuit.

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Fig. 2

State-space partitioning in 4000 cubes

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Fig. 3

Output gridding and cubes indexed by I(yref = 100) for a state-space partitioning in 4000 cubes

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Fig. 4

Real-time test-bench

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Fig. 5

Control architecture for simulation

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Fig. 8

Estimated power losses

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