Dynamic Modeling and Real-Time Simulation of a Ship Hybrid Power System Using a Mixed-Modeling Approach

Abstract

The electrification of a ship power-train is growing at a fast pace to improve efficiency and reduce emissions. The implementation of new technologies requires test and validation using various modeling approaches. However, many of the existing models of the ship hybrid power system are too complicated and demand high computational requirements, which make them inappropriate for the real-time applications. The realtime simulation model offers the benefits of testing different control algorithms along with hardware-in-the-loop testing. The bond graph-based dynamic modeling of a ship hybrid power system with a DC grid is presented as applicable to realtime simulation. The overall system model is established using different component models with varying fidelity, so-called mixedmodeling approach. In this approach, the components and control functions are modeled with different complexity such that it can capture the necessary system dynamics while minimizing the computational time. Results show that the modeled system is capable of simulating different operating strategies of the hybrid power system. Moreover, the mixed-modeling approach has enabled the system to simulate in nearly 2.5 times faster than the real-time.

Dynamic Efficiency Modeling of a Marine DC Hybrid Power System

“…In a DC hybrid power system, power-sharing between an ESD (battery) and a conventional engine-generator can occur following different power-sharing strategies [25], which also depends on battery SoC. For this system model's testing, power-sharing is performed using a rule-based PEMS, as presented in [26].…”

Co-Simulation of a Marine Hybrid Power System for Real-Time Virtual Testing

“…How detailed modeling is done may reflect how accurate results are. Higher the model fidelity, higher will be the model complexity and the computational effort [3]. Model fidelity depends not only on how the models are developed but also on how the models are simulated [21].…”

“…However, the implementation of advanced technology such as hybridization also increases the complexities in the power system. To design, test, operate, and train such complex systems in a cost-effective and riskfree environment, modeling and simulation can be an effective tool [3], [4].…”

Data-Driven Efficiency Modeling and Analysis of All-Electric Ship Powertrain: A Comparison of Power System Architectures

“…Hybridization of the power system is one of the key technologies to reduce emissions and increase energy efficiency, which applies to most vessel types. ESDs can be used in different operating modes such as peak shaving, dynamic ride through, spinning reserve, strategic loading, zero-emission operation, and power smoothing [6], [11] to harness its efficiency enhancement potential. The efficiency improvement is achieved by shifting the engine's operating point towards the optimal region, reducing the number of active generators in the bus, or reducing the start-stop of engine-generator sets.…”