A Hybrid Power System Laboratory: Testing Electric and Hybrid Propulsion

IEEE Trans. Transp. Electrific.

Pedersen

et al. 2021

Self Cite

The hybridization of power systems offers the low-emission and energy-efficient marine vessels. However, it increases the complexity of the power system. Design, analysis, control, and optimization of such a sophisticated system require reliable and efficient modeling tools to cover a wide range of applications. In this work, a typical DC hybrid power system model is developed using a bond graph modeling approach. Necessary component models of varying degrees of fidelity are developed and integrated to build a system model with reasonable accuracy. The developed system model, along with the rule-based energy management system, is used to simulate the entire system and to investigate the load-sharing strategies as well as the system stability in various operating scenarios. Moreover, the simulation results are validated with experimental results conducted on a full-scale laboratory setup of DC hybrid power system and with a ship load profile. The results show that the system model is capable of capturing the fundamental dynamics of the real system. The hybrid power system model is further used to analyze the bus voltage deviation from its nominal value. The computational efficiency presented by the system is fairly good as it can simulate faster than real-time. The developed system model can be used to build up a comprehensive simulation platform for different system analysis and control designs. Index Terms-Marine hybrid power systems, onboard DC power systems, modeling, stability, power and energy management I. INTRODUCTION T HE International Maritime Organization (IMO) has proposed stringent regulations to reduce emissions and improve energy-efficiency from the shipping industry. The energy-efficiency, low-, zero-emission, and innovative technologies are being investigated to comply with the regulations [1]. The energy storage device (ESD) based zero-emission vessel is still challenging for all types of marine vessels due to the low energy density of ESDs [2], [3]. The low energy density of ESD is compensated by the conventional Manuscript

“…The full-scale lab experimental data and the harbor tugboat load profile obtained from [1], [40] is used to validate the simulation results in the system level.…”

Section: A System Model Validationmentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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Dynamic Modeling, Simulation, and Testing of a Marine DC Hybrid Power System

Ghimire

IEEE Trans. Transp. Electrific.

Pedersen

et al. 2021

Self Cite

“…The maritime industry is adopting vessels with hybrid and electric power system to improve energy efficiency while complying with the stringent emission regulations [1], [2]. Electric propulsion with a combination of different energy carriers, as a feasible low-emission solution, is recently being widely adopted both in the newly built and retrofitted ships.…”

Section: Introductionmentioning

confidence: 99%

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

Ghimire

Reddy

2020 IEEE Transportation Electrification Conference &Amp; Expo (ITEC)

et al. 2020

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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.

“…As a response to stricter environmental regulations and an ever-increasing demand for higher energy efficiency, the maritime industry increasingly relies on hybrid and electric power system for vessels [1], [2]. The use of energy storage systems (EES), new energy sources and digital technologies enables increased efficiency and reliability as well as a low-emission operation of both newly built and retrofitted vessels [2]. At the same time, the extensive use of these technologies increases the complexity and interdependence of shipboard power systems and controllers such as power management systems (PMS) and energy management systems (EMS).…”

Section: Introductionmentioning

confidence: 99%

Modelling of a Shipboard Electric Power System for Hardware-in-the-Loop Testing

Perabo

2020 IEEE Transportation Electrification Conference &Amp; Expo (ITEC)

2020

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As the design complexity of modern maritime systems is increasing, the need for advanced and appropriate simulation technologies is higher than ever. Different subsystems such as shipboard power systems and maritime controllers are directly interlinked making system integration and testing a challenging task. Hardware-in-the-Loop (HIL) testing is an advantageous methodology used for the systematic testing of control systems regarding correct functioning, performance and reliability.In this work, we present a HIL testing methodology to verify a ship power management system (PMS). For this, an AC shipboard power system is modelled including all relevant components such as diesel engines, generators, circuit breakers and loads interfaced by the PMS. The model also includes local controllers like speed governors and automatic voltage regulators (AVRs). A functional PMS was developed and implemented emulating the behaviour of a real controller. The models are exported as Functional Mock-up Units (FMUs) which represent stand-alone simulators. As HIL testing testbed the Open Simulation Platform (OSP) environment is used. This standardized and open platform enables co-simulation and also provides HIL testing capabilities. The exported FMUs are connected via the OSP environment. A load-dependent start-stop scenario is carried out to validate the correct functioning of the PMS and the test setup.