Energy management and stabilization of a hybrid DC microgrid for transportation applications

IEEE Trans. Transp. Electrific.

Pedersen

et al. 2021

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

Section: Lithium-ion Batterymentioning

confidence: 99%

“…Moreover, it regulates and stabilizes the power system under load changes. An energy management strategy for a hybrid DC microgrid, consisting of a generator and supercapacitor, was presented in [15] along with laboratory validation.…”

mentioning

confidence: 99%

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

Ghimire

IEEE Trans. Transp. Electrific.

Pedersen

et al. 2021

“…The energy-based control scheme suggested in [15] can be utilized for charging and discharging of the ESS, in the same context that the engine starting system is the load subsystem.…”

Section: Control Of Energy Storage Systemmentioning

confidence: 99%

Energy Storage System as Auxiliaries of Internal Combustion Engines in Hybrid Electric Ships

Nam

Park

2020 15th IEEE Conference on Industrial Electronics and Applications (ICIEA)

2020

Self Cite

This paper presents a design concept to overview the feasibility of utilizing modern energy storage systems as substitution of conventional machinery auxiliaries, which are necessarily installed to support internal combustion engines' operation. For example, the common compressed air system required for engine starting and emergency stopping occupies substantial space in the machinery space of the ship. Owing to increased capacity and reduced price of batteries nowadays, electric motors and solenoid valves can supersede the compressed air system, and we can save space and reduce capital expenditures as well. The cranking torque for engine starting, motor driving current, the optimal control system is simulated to validate the performance of the engine starting system, in line with the simulation of charging and discharging of an energy storage system.

“…For the control of the output DC voltage from rectifier, decoupling control method is applied in the DQ synchronous reference frame where the three-phase voltage is transformed to DQ voltage by Park's transform. The DC voltage control approach is explained in [15]. The block diagram for the control is presented in Figure 3.…”

Section: A DC Voltage Controlmentioning

confidence: 99%

Dynamic Modeling and Stability Analysis of Onboard DC Power System for Hybrid Electric Ships

Park

2019 IEEE Transportation Electrification Conference and Expo (ITEC)

2019

Self Cite

This paper presents the dynamic modeling and stability analysis of the onboard DC power system, applicable to hybrid electric ships. The system topology is established with a special focus on the integration of the energy carriers with power electronic converters. The modeling of the AC/DC rectifier, DC/DC converter, filters and energy storage systems (ESS), such as battery and supercapacitor, is investigated. AC/DC rectifier is modeled with decoupling control through an LCL filter, and the DC/DC converter modeling is compared with the state-space averaging method and generalized averaging method. The performance of the integrated model is presented both in charging mode and in discharging mode of the energy storage system and the results show the effectiveness of the controllers and the power regulation of the ESSs. In the end, the limitation of the load is obtained by the stability analysis.