Shipboard Power System Research Papers (original) (raw)

—Modelling and simulation of emerging DC shipboard power system (SPS) is required to validate the hardware design, converter control and protection algorithms. As DC SPSs may be large and complicated, the simulation of such systems using high fidelity models generally consumes much time and the validation of performance using multiple test scenarios becomes impractical. An alternative method is to conduct such simulations in real-time using a multi-core simulation platform. Real-time simulation also allows protection relays (running embedded protection algorithms) to be verified through 'hardware in the loop' techniques. In this paper we discuss the simulation of DC SPSs in real-time using Opal-RT simulation platform. Firstly the system is modelled for non-real-time simulation. Subsequently these models are converted for real-time simulation and executed using RT-Lab on the Opal-RT target. Modelling and control approaches of DC SPS and some of the attributes of Opal-RT are also discussed.

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- Shipboard Power System

The development of the energy sector in the shipbuilding industry is crucial to sustainable energy development in general, and includes reviews and reforms of investment, the creation of the reliable source of electric power and the optimization of operating conditions by means of scientific and containing approaches in competitive requests. In the article the problem of modernization of ship electric power systems as elements of ship power plants combined (hybrid) propulsion systems in order to save fuel and service life of diesel generators are considered. For the first time addressed the prospects for the use of double-layer electrochemical capacitors (EDLC), as secondary, and accidental marine energy sources, with the possibility of partial compensation for the lack of power, as well as future promising areas of modeling, optimization and quality improvements in ship power systems in terms of their resistance to changing operating conditions. Based on preliminary calculations determined by the estimated cost of such systems, identified regulatory issues that need to be addressed in the future. According to some estimates, aspects such as the absence of effective methods of research, lack of time for rapid inspection of newly built vessels, the lack of means to accurately predict the use of alternative energy sources, depending on the speed of movement of the vessel and operating conditions, the estimated risk of non-objective assessments of energy efficiency and the absence of systemic technical conditions play the significant role in increasing the relevance of the alleged studies.

—One of the major challenges faced in the design of DC shipboard power systems (SPS) is the provision of effective DC protection. The selection of the current sensors plays an important role in the detection of fault current in DC systems. The Rogowski coil has emerged as a popular choice of current sensor for use in DC SPS protection system primarily because of its fast response and non-saturable property. This paper presents the modelling and operation of the Rogowski coil and its integration into protection algorithms to achieve effective protection. With this method, the transient conditions experienced during faults can be effectively identified and differentiated.

- by Kuntal Satpathi
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- Fault Detection, Shipboard Power System

This paper deals with controlling DC power in shipboard power. Shipboard Power System (SPS) experiences disturbance due to variations in load. A DC bus distribution system developed for the U.S. Coast Guard's 270-ft Medium Endurance Cutter is simulated using MATLAB in this paper. Whenever a fault occurs in load, the system power varies. In this paper, the DC power system is controlled automatically by detecting disturbances. The proposed method includes self-governing fault detection and controlling DC power. The shipboard power system consists of a challenge related to restoration. The reliability and flexibility of the system are improved with effective integrated Energy Storage Devices (ESD) and Solar power. A maiden attempt is made in the paper with a solar panel for the cost-effective operation of the SPS. Also, the SPS with and without the solar panel is tested for optimal operation. Furthermore, this shipboard management system may be implemented in the Indian shipboard system for optimal power management.

- by Dr.Vijay R
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- Fault Detection, Energy Storage Systems, Solar Power, Shipboard Power System

This paper presents detailed modeling of a Zonal Load Center (ZLC) for a Shipboard Power System (SPS) in a Real-Time (RT) simulation platform. The system being modeled includes the main Power Conversion Module (PCM) and Battery Energy Storage Module (BESM) with interfacing bidirectional converter, where both converters are implemented with their designed control schemes to manage diverse operational modes. To establish confidence and achieve more insight into the ZLC power converters model, a set of cross-platform Verification and Validation (V&V) activities and frequency characterization are defined and executed. These cross-platform V&V activities include small-signal characterization of terminal impedances and disturbances propagation of ZLC converters and large-signal characterization of the PCM to elicit the response to over/under-voltage. The Opal-RT technologies and MATLAB/Simulink were adopted for the RT simulation and V&V activities.

When designing a power generation project from a different source, and in our case study, wind, when calculating the annual energy produced, it is necessary to define and calculate the losses incurred in the system. The main cause of losses in a wind park is due to the oscillations caused by the turbulence of the air around the turbine because of roughness of terrain. The paper describes two methods of estimating turbulence intensity: one based on the mean and standard deviation (SD) of wind speed from the nacelle anemometer, the other from mean power output and its SD. These analyses are very important for understanding the fatigue and mechanical stress on the wind turbines. Then significance of the site ruggedness index (RIX) and the associated performance indicator (ΔRIX) are confirmed for terrain and the consequences of applying WAsP outside its operating envelope are quantified.

— DC marine architecture integrated with variable speed diesel generators (DGs) has garnered the attention of the researchers primarily because of its ability to deliver fuel efficient operation. This paper aims in modeling and to autonomously perform real-time load scheduling of dc platform supply vessel (PSV) with an objective to minimize specific fuel oil consumption (SFOC) for better fuel efficiency. Focus has been on the modeling of various components and control routines, which are envisaged to be an integral part of dc PSVs. Integration with photovoltaic-based energy storage system (ESS) has been considered as an option to cater for the short time load transients. In this context, this paper proposes a real-time transient simulation scheme, which comprises of optimized generation scheduling of generators and ESS using dc optimal power flow algorithm. This framework considers real dynamics of dc PSV during various marine operations with possible contingency scenarios, such as outage of generation systems, abrupt load changes, and unavailability of ESS. The proposed modeling and control routines with real-time transient simulation scheme have been validated utilizing the real-time marine simulation platform. The results indicate that the coordinated treatment of renewable-based ESS with DGs operating with optimized speed yields better fuel savings. This has been observed in improved SFOC operating trajectory for critical marine missions. Furthermore, SFOC minimization at multiple suboptimal points with its treatment in the real-time marine system is also highlighted. Index Terms— DC power flow, dc shipboard power system, platform supply vessel (PSV), real-time simulation.