An extendable high‐efficiency triple‐port SEPIC–SEPIC converter with continuous input currents for DC microgrid applications

2021 ◽  
Author(s):  
Chandrasekar Balaji ◽  
Chandrasekar Anuradha ◽  
Nallaperumal Chellammal ◽  
Rangachar Bharadwaj
Keyword(s):  
High Efficiency ◽  
Dc Microgrid ◽  
Continuous Input

scholarly journals DC-DC Converter Design Issues for High-Efficient DC Microgrid

2019 ◽  
Vol 21 (1) ◽  
pp. 35-41
Author(s):  
Michal Frivaldsky ◽  
Jan Morgos
Keyword(s):  
Power Density ◽  
High Efficiency ◽  
Low Voltage ◽  
Modular System ◽  
Switching Frequency ◽  
Dc Microgrid ◽  
Passive Components ◽  
Solar Systems ◽  
High Efficient ◽  
The One

In this article, the electrical properties, as well as the economic aspects of the modular and non-modular solution of the DC-DC photovoltaic converter for DC microgrid subsystem, are described. Principally a theoretical overview of the circuit configuration for the selected DC-DC stage of the DC microgrid system is shown. It is dealt with the comparison of the one non-modular high - voltage SiC-based dual - interleaved converter operating at the low switching frequency and with modular low voltage GaN-based DC-DC converters operating at high switching frequencies. The main focus is given to the research of the dependency that arises from the different module count, overall efficiency, costs, and power density (system volume). High efficiency, reduced overall volume, and maximum power density are important factors within modern and progressive solar systems. It is assumed that with the increase of switching frequency within the modular system the volume reduction of the passive components will be highly demanded, thus PCB dimensions and overall volume can be reduced. This dependency is investigated, while the total volume of the non-modular system is a unit of the measure. For these purposes, the design of variant solution was done, and consequently mutually compared in the way of simulations and experimental measurements.

scholarly journals Single Conversion Stage Three Port High Gain Converter for PV Integration with DC Microgrid

2020 ◽  
Vol 26 (3) ◽  
pp. 69-78
Author(s):  
Muhammad Arif ◽  
Mohsin Shahzad ◽  
Jawad Saleem ◽  
Waheed Malik ◽  
Abdul Majid
Keyword(s):  
High Efficiency ◽  
Operating Mode ◽  
High Gain ◽  
Dc Microgrid ◽  
Single Input Single Output ◽  
Single Output ◽  
Single Input ◽  
Conversion Stage ◽  
Operational Modes ◽  
Main Operating

A high gain three port converter with a unidirectional port for photovoltaic (PV) side and two bidirectional ports one each for the battery and the DC bus for PV integration to DC microgrid is presented. High gain is achieved by a coupled inductor with switched capacitor, whereas single stage conversion is used between the ports to achieve high efficiency. The proposed converter is modelled in PLECS/MATLAB and the simulated results for various operational modes are validated using a 500 W prototype. For main operating mode, i.e., single input single output (SISO), the efficiency is calculated to be as high as 96 %. Similarly, owing to the reduced number of components, the losses are reduced considerably for different operation modes.

scholarly journals Control Algorithm for Equal Current Sharing between Parallel-Connected Boost Converters in a DC Microgrid

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Muamer M. Shebani ◽  
M. Tariq Iqbal ◽  
John E. Quaicoe
Keyword(s):  
Control Algorithm ◽  
High Efficiency ◽  
Control Method ◽  
Storage System ◽  
Dc Microgrid ◽  
Load Current ◽  
Total Load ◽  
Boost Converters ◽  
Current Sharing ◽  
Complexity Cost

DC microgrids are gaining more attention compared to AC microgrids due to their high efficiency and uncomplicated interconnection of renewable sources. In standalone DC microgrid, parallel-connected converters connect the storage system to the load. To achieve equal current sharing among parallel converters, several methods have been presented, but they vary in their current sharing performance, complexity, cost, and reliability. In DC microgrid, the conventional droop control method is preferred because it is more competitive in terms of cost, suitability, and reliability compared to the master-slave control method. However, the conventional droop method cannot ensure equal current sharing due to the mismatches in parameters of parallel-connected converters. To address this limitation, a control algorithm that supervises a modified droop method to achieve precise current sharing between parallel modules is proposed in this paper. The control algorithm is based on the percentage of current sharing for each module to the total load current. The output current measurement of each converter is compared to the total load current and is used to modify the nominal voltage for each converter. The effectiveness of the proposed algorithm is verified by MATLAB simulation model and experimental results.

scholarly journals A Review of DC Microgrid Energy Management Systems Dedicated to Residential Applications

Energies ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4308
Author(s):  
Sadaqat Ali ◽  
Zhixue Zheng ◽  
Michel Aillerie ◽  
Jean-Paul Sawicki ◽  
Marie-Cécile Péra ◽  
...  
Keyword(s):  
Energy Management ◽  
Energy Demand ◽  
High Efficiency ◽  
Renewable Energy Sources ◽  
Storage System ◽  
Positive Development ◽  
Extensive Literature ◽  
Dc Microgrid ◽  
Dc Microgrids ◽  
Microgrid Energy Management

The fast depletion of fossil fuels and the growing awareness of the need for environmental protection have led us to the energy crisis. Positive development has been achieved since the last decade by the collective effort of scientists. In this regard, renewable energy sources (RES) are being deployed in the power system to meet the energy demand. The microgrid concept (AC, DC) is introduced, in which distributed energy resources (DERs), the energy storage system (ESS) and loads are interconnected. DC microgrids are appreciated due to their high efficiency and reliability performance. Despite its significant growth, the DC microgrid is still relatively novel in terms of grid architecture and control systems. In this context, an energy management system (EMS) is essential for the optimal use of DERs in secure, reliable, and intelligent ways. Therefore, this paper strives to shed light on DC microgrid architecture, control structure, and EMS. With an extensive literature survey on EMSs’ role, different methods and strategies related to microgrid energy management are covered in this article. More attention is centered on the EMS for DC microgrids in terms of size and cost optimization. A very concise analysis of multiple optimization methods and techniques has been presented exclusively for residential applications.

ISOLATED HIGH STEP-UP ZERO-VOLTAGE-SWITCHING DC-DC CONVERTER WITH A CONTINUOUS INPUT CURRENT

2011 ◽  
Vol 20 (08) ◽  
pp. 1619-1635 ◽  
Author(s):  
HYUN-LARK DO
Keyword(s):  
High Efficiency ◽  
Input Current ◽  
Leakage Inductance ◽  
Zero Voltage Switching ◽  
Analysis And Design ◽  
High Voltage Gain ◽  
Power Switches ◽  
Continuous Input ◽  
Zero Voltage ◽  
Voltage Switching

An isolated high step-up DC-DC converter with a continuous input current is proposed. The proposed converter consists of two converter cells — a boost converter cell at the input stage for a low input current ripple and a DC-DC converter cell for high voltage gain. Zero-voltage-switching of power switches are achieved and the leakage inductance of the transformer alleviates the reverse-recovery problems of the output diodes. Therefore, the proposed converter achieves high efficiency. Detailed analysis and design of the proposed converter are carried out. A prototype of the proposed converter is developed, and its experimental results are presented for validation.

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