Abstract
Power availability to preserve propulsion is a vital issue in the shipping industry which relies on persistent power generation and maintaining the stability of the power and propulsion system. Since the introduction of on-board all-electric Direct Current Power and Propulsion Systems (DC-PPS) with hybrid power generation, which are more efficient compared to direct-diesel and Alternating Current (AC) all-electric configurations, there have been extensive investigations on stabilization and power generation control to enable robust and reliable performance of DC-PPS during different ship operations. In this paper, a multi-level approach is proposed for hybrid power generation control. For this goal, first, a mathematical model is proposed for each power system component and then, the overall on-board power system is modeled in a state space format. Then, a multi-level Model Predictive Control (MPC) approach is proposed for the DC voltage control which unlike conventional droop control approaches, takes the DC current generated by power sources into account explicitly. The performance of the proposed approach is evaluated via several simulation experiments with a high fidelity model of a high voltage DC-PPS. The results of this paper lead to enabling more effective approaches for power generation and stability control of constant power loaded microgrids.
Highlights
Due to the regulations imposed by international maritime author ities, the shipping industry is working extensively towards reducing its environmental impact
A multi-level Model Predictive Control (MPC) approach is proposed for the DC voltage control which unlike conventional droop control ap proaches, takes the DC current generated by power sources into account explicitly
A multi-level model predictive power generation con trol approach is proposed for DC Power and Propulsion Systems (DCPPS)
Summary
Due to the regulations imposed by international maritime author ities, the shipping industry is working extensively towards reducing its environmental impact. Over the last few decades, in order to enable the optimal use of the energy sources, one of the main strategies has been the introduction of novel and more fuel efficient power and propulsion system configurations. These advanced power and propul sion systems are regarded as substitutions for the conventional directdiesel configuration in which the relationship between the propeller and the diesel engine is established directly through a drive shaft. One of the main barriers in enabling DC-PPS for widespread use is the problem of DC grid voltage stability and control of Diesel-GeneratorRectifier (DGR) sets as well as battery-converter sets [4,5]. Nonlinear dynamics of DGR and battery-converter sets as well as adverse effects of Constant Power Loads (CPL) are among the reasons that negatively affect the power generation quality and cause instability [4,6]
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