Computationally efficient long-Horizon direct model predictive control for transient operation

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Conference Proceeding
2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017, 2017, 2017-January pp. 4642 - 4649
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© 2017 IEEE. In this paper we present modifications in the sphere decoder initially introduced in [1] and modified in [2] that allow for its implementation in transient operation. By investigating the geometry of the integer problem underlying direct model predictive control (MPC), a new sphere that guarantees feasibility and includes a significant smaller number of candidate solutions is computed. In a first analysis, the computational complexity can be reduced by up to 99.7% when a variable speed drive system consisting of a three-level neutral point clamped (NPC) voltage source inverter and a medium-voltage induction machine is examined. As also shown, optimality is sacrificed only to a limited extent, thus maintaining the very fast transient response inherent to direct MPC.
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