Bidirectional isolated three‐phase dc‐dc converter using coupled inductor for dc microgrid applications

Distributed energy resources have been broadly developed in recent years for supporting DC and AC microgrids. Unfortunately, most of them produce low output DC or AC voltages, and interfacing converters are required. These are implemented either in single‐stage or dual‐stage configurations. Step‐up converters are the essential section in dual‐stage designs, which their producing gain is important. Improving the boost factor and efficiency as well as decreasing the number of required components and electrical stresses on power components are the most critical challenges in designing such topologies. Continuing past efforts, this paper proposes a new non‐isolated step‐up DC/DC converter that can be used in low‐voltage distributed power systems and many other applications requiring step‐up DC/DC conversion. The topology requires only one power switch located on the converter's low voltage (LV) side. Hence, it can be easily selected from LV ratings, low on‐resistance power semiconductors. Besides, the converter operates with a continuous input current, which is a valuable feature in connection with current‐sensitive voltage resources. Compared with the recently proposed topologies, the topology provides better conversion gain and efficiency. In this article, the operating principle of the introduced converter is comprehensively investigated. Also, in order to examine the converter performance, experimental results will be presented and analyzed. For this purpose, a 400 V/400 W prototype has been designed and built. Results confirm the above claims and show that the converter efficiency equals 96.1%, and it produces high output voltage gain about 12 times.

Section: Introductionmentioning

confidence: 87%

Non‐isolated high step‐up DC/DC converter for low‐voltage distributed power systems based on the quadratic boost converter

Hajiabadi

Eshkevari

Mosallanejad

et al. 2022

“…However, a large number of switches had been utilized in this converter, which make the control circuit to be complex. In Berrehil El Kattel et al, 30 the isolated bidirectional DC-DC converter was proposed, which achieved efficient power conversion with a wide input voltage range, continuous input current, and bidirectional operation. However, the number of components is high, and the high number of transformers have been utilized that leads to increase the system cost and volume.…”

Section: Literature Reviewmentioning

confidence: 99%

A bidirectional multiport DC‐DC converter applied for energy storage system with hybrid energy sources

Pourjafar

Shayeghi

Sedaghati

et al. 2021

This paper presents a novel bidirectional multiport DC-DC converter for the electrical vehicles with hybrid energy sources. The benefits of the suggested converter are high voltage conversion ratio and high efficiency, simple structure, low voltage stress across the semiconductor elements, low number of components, and common ground features. It has two bidirectional ports, which are suitable for energy storage systems (ESS) such as a battery. Due to the step-up and step-down operations of the proposed converter, it can charge and discharge the ESS. Additionally, only two power switches with low ON-state resistance are utilized that make the control circuit to be simple. Furthermore, the suggested converter has low number of component, which leads to decrease its volume and cost. The operation principle in buck and boost mode is analyzed thoroughly. Finally, to verify the analysis and effectiveness of the proposed structure, a laboratory prototype is built with 12-and 20-V input voltages and a power rating of 120 W used in 50-kHz operating frequency.

“…A MG can operate in two ways: grid‐connected and islanding modes. MG with renewable resources 1,2 (e.g., solar photovoltaic, wind, and tidal) can address the environmental crisis, 3,4 power quality issues, 5,6 and electricity demand. Unfortunately, the intermittent nature of renewable resources can bring uncertainties in MG operation and power system development 7 .…”

Section: Introductionmentioning

confidence: 99%

Model predictive control of solar photovoltaic‐based microgrid with composite energy storage

Majji

Mishra

Dongre

2022

Summary The renewable energy (e.g., solar photovoltaic)‐based grid‐connected microgrid (MG) with composite energy storage system (CESS) is feasible to ensure sustainable and quality power to the commercial and domestic load demands. Effective control systems provide the dynamic performance of such deployed MGs. This paper investigates the application of the finite control‐set model predictive controller (FCS‐MPC) for solar photovoltaic‐based grid‐connected MGs with composite energy storage. FCS‐MPC considers the discrete nature of interfacing (DC–AC and DC–DC) converters into the control algorithm to predict the optimal control command for reference current tracking. Compared to classical control approaches, FCS‐MPC provides a fast‐dynamic response, discards the modulation stage, and effectively handles the effects of dynamic source and load variations and nonlinear loads. The control system encapsulates a proportional–integral (PI) controller, low‐pass filter (LPF), power management algorithm (PMA) unit, and followed by the FCS‐MPC approach. The CESS unit consists of a battery and supercapacitor storage system. The efficacy of the FCS‐MPC approach is verified through the MATLAB/Simulink results. Solar photovoltaic variation due to irradiance, utility grid availability, electricity pricing, and dynamic load variations are considered in the implementation. Furthermore, real‐time simulation of the proposed method is validated using OPAL‐RT OP4510 real‐time simulator.