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This paper proposes a power sharing scheme for an Islanded DC microgrid with hybrid energy storage system (HESS). HESS comprises of battery and supercapacitor (SC), where the usage of supercapacitor reduces the current stresses on the battery. This scheme reduces the losses in the HESS interfacing converters along with State of Charge (SOC) balancing. To maintain a constant DC link voltage a DC link...
This paper presents a DC microgrid integrated dynamic voltage restorer (DVR) system to mitigate the grid voltage sag and swell. The DC source of the DVR is the DC microgrid, including the PV array and hybrid energy storage system consisting of lithium-ion battery and supercapacitor. Compared to the conventional DVR supplied by pure energy storages, the DC microgrid will prolong the operation the DVR...
This paper presents the establishment and operation control strategy of a DC microgrid incorporated with bidirectional inductive power transfer (BIPT) system for Electric Vehicles (EVs) charging applications. The primary side of IPT system is powered by a DC microgrid which is established from PV as renewable energy source and battery for energy storage. The proposed concept minimizes power electronic...
In this paper, the hierarchical control strategy of a photovoltaic/battery based dc microgrid is presented for electric vehicle (EV) wireless charging. Considering irradiance variations, battery charging/discharging requirements, wireless power transmission characteristics, and onboard battery charging power change and other factors, the possible operation states are obtained. A hierarchical control...
The stability of bus voltage is the main target of DC microgrid operation. DC microgrid including constant power load, distributed generations employed droop control, and resistive load is investigated. The constant power load can reduce system stability margin, and even cause bus voltage oscillating. The droop control can share the current among different distributed generations, but it can result...
Frequency regulation of electric power systems efficiency depends on response time and on power reserves for frequency regulation. As integration of non-dispatchable renewable generation in the power system results with increased need for power reserves from fast responding power units, the idea of using aggregated DC microgrids in frequency regulation is presented. Model proposed in this work is...
This paper investigates virtual inertia control for dc microgrids using voltage droop control as the power-sharing strategy. An adaptive virtual inertia control (AVIC) strategy with the variable droop coefficient is proposed to increase the inertia of the dc microgrid. By swinging the droop curve during transient events, the dc voltage change rate is reduced. The variable droop coefficient is modified...
Microgrids have gained more popularity with advancement in renewable energy technology, mainly solar. While the boom in renewable technology has provided an alternative solution for energy crisis and depleting conventional sources, their intermittent nature has raised various control and protection issues. In both AC and DC microgrids, protection issues remain similar except the fact that in DC microgrids...
Management of multiple energy storage devices in a DC microgrid is a challenge. Conventional method, such as droop control, cannot ensure accurate current sharing in coordinating multiple battery banks, which limits the DC microgrid system performance. This paper proposed an active DC bus signaling (ADBS) method to coordinate multiple battery banks in a DC microgrid. It has the advantages of accurate...
DC microgrids are gaining popularity due to the higher efficiency, reliability, lower costs and better compatibility with DC loads compared to their AC counterparts. Large-scale deployment of distributed renewable energy resources like solar in the microgrids, has to provide utilities and grid operators the capability to safely and reliably mitigate the impact of solar and loads intermittency on the...
This paper presents a model of multiple DC microgrids with battery energy storage systems and demand response capability, taking part in primary frequency regulation of electrical power system. Although DC microgrids can contribute to stability and efficiency of frequency regulation, these complex systems may cause serious stability issues due to the imperfect communication. This work presents possible...
Due to the challenge of energy demand, renewable energy sources are introduced to our daily life in order to satisfy the energy demand and reduce the emission of greenhouse gas. But the increasing penetration of renewable energy sources causes obvious impact on the conventional power systems especially the control strategies. In order to solve the problem, microgrid is introduced, which usually consists...
A bipolar dc microgrid features three voltage levels and is capable of transmitting power more efficiently than a unipolar system. This paper proposes a droop control to achieve load sharing and voltage balancing in such a microgrid system. Droop control is adopted to ensure that autonomous sharing of load power can be realized without communication. Moreover, the positive and negative pole voltages...
The paper presents a microgrid structure, based on wind and photovoltaic (PV) renewable energies inputs, implemented in a dedicated configurable microgrid laboratory. The wind turbine is realized through a Hardware-in-the-Loop (HIL) emulator. PV energy can be taken from a set of panels or from a programmable DC source, which can implement the I–V characteristics of the real system. The microgrid configuration,...
In this paper, an autonomous communication-based centralized control for DC microgrids (MG) has been developed and implemented. The proposed controller enables smooth transition between various operating modes. Finite state machine (FSM) has been used to mathematically describe the various operating modes (states), and events that may lead to mode changes (transitions). Therefore, the developed centralized...
As an essential part of energy internet, microgrids with renewable sources arise rapidly in recent decades to meet the power requirements and solve environmental problems. In this paper, a novel bus voltage control strategy for power management system in DC microgrid with photovoltaic (PV) generation and energy storage system is proposed. System configuration and control methods of all devices are...
This paper presents an intelligent droop control scheme for DC/DC Boost converter which is used as voltage regulator in islanded DC Microgrid. This approach is a combination of Fuzzy Inference System (FIS) and Genetic Algorithm (GA) which is used to improve voltage regulation and equal power sharing between the DGs under abrupt load changing while the power losses is low. The propose control performance...
To meet the fast-growing energy demand and, at the same time, tackle environmental concerns resulting from conventional energy sources, renewable energy sources are getting integrated in power networks to ensure reliable and affordable energy for the public and industrial sectors. However, the integration of renewable energy in the ageing electrical grids can result in new risks/challenges, such as...
Nowadays, renewable energy technologies, such as solar power and wind power, are trend to replace conventional energy resources. In the meantime, DC Microgrid is becoming popular in distribution systems due to the better compatibility and simpler system control strategy. This paper presents a hierarchical coordinated control strategy for DC Microgrid with wind turbine and photovoltaic array under...
In this paper, a loss optimized and cost effective droop control scheme is proposed for a DC microgrid coupled to a weak rural distribution grid. The active power exchange limits between the DC microgrid and the utility grid have been derived considering the Indian voltage regulation standards as set by Central Electricity Authority at the point of common coupling. In the grid-connected mode, the...
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