Distributed control strategy of hybrid energy storage system in the DC microgrid

Teng, Changpeng; Wang, Yubin; Wang, Fan; Zhang, Fengyi

doi:10.1049/joe.2018.8493

Cited by 7 publications

(4 citation statements)

References 11 publications

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“…The problem of unequal current sharing due to the reduction of DC bus voltage in conventional droop control is resolved in [153] with the adaptive droop and voltage shifting techniques based on the communication of the neighboring distributed units. To reduce the power fluctuation in islanded DC microgrids due to the intermittent nature of PV energy, a distributed control of hybrid energy storages, such as battery and ultracapacitor, are presented in [167]. The ultracapacitor controls the DC bus voltage, whereas the battery controls the SOC of the ultracapacitor.…”

Section: ) Distributed Controlmentioning

confidence: 99%

DC Microgrid Planning, Operation, and Control: A Comprehensive Review

Al–Ismail

2021

IEEE Access

338

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In recent years, due to the wide utilization of direct current (DC) power sources, such as solar photovoltaic (PV), fuel cells, different DC loads, high-level integration of different energy storage systems such as batteries, supercapacitors, DC microgrids have been gaining more importance. Furthermore, unlike conventional AC systems, DC microgrids do not have issues such as synchronization, harmonics, reactive power control, and frequency control. However, the incorporation of different distributed generators, such as PV, wind, fuel cell, loads, and energy storage devices in the common DC bus complicates the control of DC bus voltage as well as the power-sharing. In order to ensure the secure and safe operation of DC microgrids, different control techniques, such as centralized, decentralized, distributed, multilevel, and hierarchical control, are presented. The optimal planning of DC microgrids has an impact on operation and control algorithms; thus, coordination among them is required. A detailed review of the planning, operation, and control of DC microgrids is missing in the existing literature. Thus, this article documents developments in the planning, operation, and control of DC microgrids covered in research in the past 15 years. DC microgrid planning, operation, and control challenges and opportunities are discussed. Different planning, control, and operation methods are well documented with their advantages and disadvantages to provide an excellent foundation for industry personnel and researchers. Power-sharing and energy management operation, control, and planning issues are summarized for both grid-connected and islanded DC microgrids. Also, key research areas in DC microgrid planning, operation, and control are identified to adopt cuttingedge technologies. This review explicitly helps readers understand existing developments on DC microgrid planning, operation, and control as well as identify the need for additional research in order to further contribute to the topic. INDEX TERMS DC microgrids, renewable energy sources, batteries, supercapacitors, DC bus voltage, power management, state of charge, microgrid operation, and planning.

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Section: ) Distributed Controlmentioning

confidence: 99%

DC Microgrid Planning, Operation, and Control: A Comprehensive Review

Al–Ismail

2021

IEEE Access

338

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“…The second level of control mainly regulates voltage fluctuations and Manuscript received March 7, 2023; revised May 18, 2023; accepted June 16, 2023. *Corresponding author deviations. The control schemes involved are mainly divided into three types: centralized control, decentralized control, and distributed control [3][4][5]. Among them, centralized control, which requires a central control unit, has been widely studied although it's a weaker ability to deal with faults or disasters, while decentralized control is relatively stronger in this regard, but has limited global control capability.…”

Section: Introductionmentioning

confidence: 99%

Experimental Verification and Simulation Analysis of a Battery Directly Connected DC-Microgrid System

Liu,

Yamada,

Iwatsuki

et al. 2023

IJEETC

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The transformation towards renewable and sustainable energy, as well as the digitalization of energy, has promoted the development of the power system towards miniaturization, decentralization, and intelligence. As a solution, a battery-directly-connected DC microgrid has been proposed in previous studies for autonomous and decentralized coordination control (ADCC). We constructed a testbed of the battery directly connected DC-microgrid in our university campus which has been operating stably for more than one year. This study experimentally verifies the feasibility of the battery-directly-connected DC microgrid, and the process of autonomous, decentralized, and coordinated energy distribution between the distributed small batteries through power loading experiments. In addition, a simulator for analyzing the behavior of the DC microgrid test platform is built in MATLAB/Simulink, and its accuracy is verified based on an energy flow analysis, revealing its potential for cyber-physical-system (CPS) construction.

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“…It is common for a single energy storage element to fall short of this criterion. As a result, the HESS, which consists of a battery and a supercapacitor, is employed to provide the load with stable and reliable power [8, 9]. Battery can store a huge amount of energy because to its high energy density, but it still has problems with sluggish response speed and short service life.…”

Section: Introductionmentioning

confidence: 99%

Frequency coordination and harmonic suppression strategy based on composite virtual impedance in hybrid energy storage system

Zhu

Yang

Huang

2022

IET Power Electronics

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Under the traditional droop control, hybrid energy storage system cannot take advantage of the respective merits of battery and supercapacitor for frequency coordination, which shortens system life. Because of the single‐phase inverter load, the second harmonic current is generated in the front‐stage converter when the output power pulsates at twice the output voltage frequency. This paper proposes a strategy for frequency coordination and second harmonic current suppression based on composite virtual impedance. Under this strategy, the system equivalent output impedance exhibits resistance and inductance in low‐frequency part, dominated by the battery side. The battery reacts slowly to absorb the low‐frequency power fluctuations and provide the energy required by load at steady state. It is capacitive in the high‐frequency range, with the supercapacitor side dominating. The supercapacitor quickly absorbs the high‐frequency part of power fluctuation to suppress the impact of load mutation on DC bus and improve system dynamics. Meanwhile, the strategy realises that the inductor branch impedance is significantly larger than the capacitor branch impedance at double frequency, suppressing the second harmonic current and increasing the system efficiency. Experimentation confirms the effectiveness of the control strategy.

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Distributed control strategy of hybrid energy storage system in the DC microgrid

Cited by 7 publications

References 11 publications

DC Microgrid Planning, Operation, and Control: A Comprehensive Review

DC Microgrid Planning, Operation, and Control: A Comprehensive Review

Experimental Verification and Simulation Analysis of a Battery Directly Connected DC-Microgrid System

Frequency coordination and harmonic suppression strategy based on composite virtual impedance in hybrid energy storage system

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