A Multi-Port Half Bridge DC-DC Converter for PV Application (original) (raw)
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IET Power Electronics, 2018
This paper studies a two-input boost DC/DC converter with high output voltage gain. The presented converter has several advantages such as high step-up capability, continuous input current, bidirectional power flow from one of the ports, and its simple and low-cost structure. The presented converter can achieve a high output voltage gain without using a coupled inductor or a transformer in its structure. Coupled inductors can cause voltage spikes on the main power switch, so active/passive clamp circuits are additionally required to eliminate the voltage spikes. The continuous input current of the presented converter makes it suitable for renewable energy sources such as photovoltaic panels and fuel cells. An energy storage source such as a battery pack can be used in the presented converter. Charging and discharging of the energy storage source is possible using the presented converter. Pulsating charging current of the battery can improve the lifetime of the battery. In addition, discharging of the battery can be done without any constraints in the duty cycles. The thorough analysis and design of the proposed converter are discussed. A 300W prototype of the presented converter is also used to verify the feasibility and proper operation of the converter.
ANALYSIS OF MULTIPORT DC-DC CONVERTER IN RENEWABLE ENERGY SOURCES
Multi-port DC-DC converter has attracted special interest in applications where multiple energy sources are used. In this project, a three-port converter with three active full bridges, two LCC resonant tanks, and a three-winding transformer is proposed. It uses a single power conversion stage with high-frequency link to control power flow between batteries, load, and a renewable source such as solar cell. The converter has capabilities of bidirectional power flow in the battery and the load port. The converter has high efficiency due to soft-switching operation in all three bridges. Design procedure for the three-port converter is explained and experimental results are presented.
A Review on Multiport DC-DC Converter for Different Renewable Energy Sources
This paper focuses a review on multiport dcdc converter for concurrent power management of several renewable energy sources which can be of similar types. The introduced dc-dc converter uses only one controllable switch in each port to which a source is connected. It has simple configuration and minimum number of power switches. The introduced converter is applied for simultaneous maximum power point tracking (MPPT) control of a wind/solar hybrid generation system consisting of one Wind Turbine Generator (WTG) and two different Photovoltaic (PV) panels.
An Integrated Topology of Three-Port DC-DC Converter for PV-Battery Power Systems
IEEE Open Journal of the Industrial Electronics Society
This paper introduces an integrated topology of isolated three-port dc-dc converter (TPC) to interface Photovoltaic (PV) and battery for standalone system. To guarantee zero circulating current flow between different ports while permitting bidirectional power flow at the battery port, auxiliary switches are utilized with the active bridges of the proposed TPC topology. In addition, a simple switching scheme based on Pulse Width Modulation (PWM) is proposed for the input ports of the TPC. This action eliminates the need for the phase shift modulation used for conventional isolated TPCs. While the PV port is controlled to track the maximum power point, the battery port is managed to regulate the load voltage. The paper presents the detailed mathematical analysis of the different operation modes of the proposed integrated TPC topology and the estimated control limits during charging and discharging of the battery. Consequently, dynamic limiters for the duty cycle of each port are set. The proposed integrated TPC based PV-battery system is simulated using PSCAD/EMTDC software package to validate the analysis of different operation modes and to assess the dynamic performance of the system. Moreover, experimental results are presented to authenticate different operation modes of the proposed TPC topology and to evaluate the dynamic behavior of the integrated PV-battery system. INDEX TERMS Three-port dc-dc converter, PV-battery power system, voltage regulation.
Analysis and Design of a Multi-Port DC-DC Converter for Interfacing PV Systems
Energies, 2021
A high-frequency multi-port (HFMP) direct current (DC) to DC converter is presented. The proposed HFMP is utilized to interface a photovoltaic (PV) system. The presented HFMP is compact and can perform maximum power point tracking. It consists of a high-frequency transformer with many identical input windings and one output winding. Each input winding is connected to a PV module through an H-bridge inverter, and the maximum PV power is tracked using the perturb and observe (P&O) technique. The output winding is connected to a DC bus through a rectifier. The detailed analysis and operation of the proposed HFMP DC-DC converter are presented. Extensive numerical simulations are conducted, using power system computer aided design (PSCAD)/electromagnetic transients including DC (EMTDC) software, to evaluate the operation and dynamic behavior of the proposed PV interfacing scheme. In addition, an experimental setup is built to verify the performance of the HFMP DC-DC converter.
A High Step-Up Three-Port DC–DC Converter for Stand-Alone PV/Battery Power Systems
A three-port dc-dc converter integrating photovoltaic (PV) and battery power for high step-up applications is proposed in this paper. The topology includes five power switches, two coupled inductors, and two active-clamp circuits. The coupled inductors are used to achieve high step-up voltage gain and to reduce the voltage stress of input side switches. Two sets of active-clamp circuits are used to recycle the energy stored in the leakage inductors and to improve the system efficiency. The operation mode does not need to be changed when a transition between charging and discharging occurs. Moreover, tracking maximum power point of the PV source and regulating the output voltage can be operated simultaneously during charging/discharging transitions. As long as the sun irradiation level is not too low, the maximum power point tracking (MPPT) algorithm will be disabled only when the battery charging voltage is too high. Therefore, the control scheme of the proposed converter provides maximum utilization of PV power most of the time. As a result, the proposed converter has merits of high boosting level, reduced number of devices, and simple control strategy. Experimental results of a 200-W laboratory prototype are presented to verify the performance of the proposed three-port converter.
Multiport DC-DC Converter for Different Renewable Energy Sources
According to previous approaches multiport dc-dc converter for concurrent power management of several renewable energy sources which can be of similar types. The introduced dc-dc converter uses only one controllable switch in each port to which a source is connected. It has simple configuration and minimum number of power switches. The introduced converter is applied for simultaneous maximum power point tracking (MPPT) control of a wind/solar hybrid generation system consisting of one Wind Turbine Generator (WTG) and two different Photovoltaic (PV) panels. With the world oil crisis, dangers of overdependence on oil pushed for the development of alternative energy sources. Current international trend in electricity generation is to utilize renewable energy resources. Solar, wind, biomass, micro hydro systems can be seen as suitable alternatives to conventional power. So far these vast renewable energy resources, wind and solar, are not sufficiently harnessed for power generation. Thus, in this dissertation a hybrid renewable power generation system integrating the available solar wind and hydro resources will be investigated in detail for a specific location.
Three-Port DC–DC Converter for Stand-Alone Photovoltaic Systems
IEEE Transactions on Power Electronics, 2015
System efficiency and cost effectiveness are of critical importance for photovoltaic (PV) systems. This paper addresses the two issues by developing a novel three-port DC-DC converter for stand-alone PV systems, based on an improved Flyback-Forward topology. It provides a compact single-unit solution with a combined feature of optimized maximum power point tracking (MPPT), high step-up ratio, galvanic isolation and multiple operating modes for domestic and aerospace applications. A theoretical analysis is conducted to analyze the operating modes followed by simulation and experimental work. The paper is focused on a comprehensive modulation strategy utilizing both PWM and phase-shifted control that satisfies the requirement of PV power systems to achieve MPPT and output voltage regulation. A 250 W converter was designed and prototyped to provide experimental verification in term of system integration and high conversion efficiency. Index Terms-DC-DC power conversion, maximum power point tracking, phase shift, photovoltaic power system, voltage control. I. INTRODUCTION OLAR energy is a primary and renewable source of energy. As the cost of photovoltaic (PV) panels is seen to reduce continuously, PV-based power generation is gaining in
A Reconfigurable Three-Port DC–DC Converter for Integrated PV-Battery System
IEEE Journal of Emerging and Selected Topics in Power Electronics, 2019
In this paper, a new non-isolated three-port DC-DC converter to integrate a battery storage with a photovoltaic module is proposed for off-grid solar power applications. The proposed converter can be used to integrate the PV module with a backup battery to minimize the impacts of renewable energy intermittency and unpredictable load demand. The proposed converter is reconfigurable and able to operate as a conventional boost converter, a buck-boost converter or a forward converter in different modes to support several power flow combinations and achieve power conditioning and regulation among the PV module, battery and output port simultaneously. Nevertheless, the power stage only consists of two switches, one coupled inductor, one diode and two capacitors. High voltage conversion ratio is achieved by using a coupled inductor and by combining the photovoltaic module and the battery in series. Experimental results of the proposed converter operating in the steady-state and during transitions between different modes are reported.
Three port converters used as interface in photovoltaic energy systems
Advances in Science, Technology and Engineering Systems Journal, 2018
The aim of this paper is to derive and study a full-bridge three-port converter. Based on the standard design of full-bridge converter, we have modeled and derived a three port converter. The three port converter can be used in renewable energy scenarios, such as solar cells or wind turbines connected to the input port. The input can be taken from twoports simultaneously or from one port at a time. In order to balance the power mismatch between the input port and load port, the batteries are attached to the third port, to ensure there are no discrepancies in the power generated at the input and power demand at the load. In order to ensure isolation and reduced voltage stress on the switches, a high frequency transformer is also used in the design. The overall design contains four switches, and four diodes. MOSFETs are the strongest candidate for the switches owing to their high switching speed, lower losses and high resistance to higher voltage. Moreover, a buckboost structure is modeled in order to ensure that it can work for a wide variety of different applications by adjusting the duty cycle of the switches properly. To minimize the switching losses in the converter, Zero-Voltage Switching (ZVS) is also achievable in the modeled system.