4.6 Article

Predictive power-split system of hybrid ship propulsion for energy management and emissions reduction

Journal

CONTROL ENGINEERING PRACTICE
Volume 111, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.conengprac.2021.104795

Keywords

Energy management; Model predictive control; Power-split control; Hybrid marine propulsion; Integrated propulsion control

Funding

  1. Eugenides Foundation, Greece

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In this work, an energy management system for optimal power-split in hybrid ship propulsion is developed. The torque of the diesel engine and electric machine are regulated based on a predictive strategy with a weighting factor for fuel consumption and NOx emissions. A disturbance observer is designed to estimate propeller load characteristics, and a neural network model predicts rotational speed reference. Parametric simulation evaluates the trade-off between fuel consumption and NOx emissions reduction, and the control scheme is experimentally implemented to handle environmental disturbance rejection while following desired speed reference.
In this work, an energy management system to address the optimal power-split problem in hybrid ship propulsion is developed. The torque of the diesel engine and the electric machine is regulated based on a predictive strategy with a weighting factor which determines the trade-off between fuel consumption and NOx emissions minimization. The modeling for the controller design is based on first principles and data gathered from the hybrid plant. In addition a disturbance observer is designed to estimate the propeller load characteristics. A neural network model that predicts rotational speed reference within the prediction horizon complements the control system design. It is used along with the observer to calculate the future load demand. A parametric simulation study is performed for the trade-off evaluation between fuel consumption and NOx emissions reduction of the control scheme. The control scheme is experimentally implemented and tested in real-time operation, where it has to cope with environmental disturbance rejection and follow the desired rotational speed reference, while performing the power-split in respect to the fuel to NOx weighting parameter and operate the plant within the desirable constraints.

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