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Small-scale photovoltaic (PV) systems commonly use single-phase grid-connected (GC) inverters to feed the generated power into the power grid. In this case the instantaneous GC inverter output power shows a 100 Hz fluctuation. However it is required to keep the instantaneous PV array output power as constant as possible to maximise the average PV array output power. Thus all GC inverters use an energy...
A Lyapunov-based control scheme for single-phase single-stage grid-connected photovoltaic central inverters is presented. Besides rendering the closed-loop system globally stable, the designed controller is able to deal with the system uncertainty that depends on the solar irradiance. A laboratory prototype has been built as a proof of concept for the proposed control technique. A nonlinear passive...
In an effort to utilize the solar energy effectively through power electronics converters (conditioners), a great deal of research is being carried out to meet the increasing demand for load. This paper proposes an experimental photovoltaic (PV) power conditioning system with line connection. The conditioner consists of a flying capacitors multi-cell inverter fed by a dc-dc boost converter. The boost...
This paper discusses the loading limitations in PV systems resulting from switching the power electronic interfaces and transients associated with large loads. These conditions derate the power generation capability of the PV system. We propose some methods to enhance the loadability of these systems under both steady state and dynamic operations. A PV system for home application purposes, with a...
This paper explores a new breed of energy storage system interfacing for grid connected photovoltaic (PV) systems. The proposed system uses the popular dual inverter topology in which one inverter is supplied by a PV cell array and the other by a Battery Energy Storage System (BESS). The resulting conversion structure is controlled in a way that both demand matching and maximum power point tracking...
Photovoltaic (PV) arrays are always assembled based on centralized, string and multi-string technology. These complex configurations of PV arrays and non-dependent maximum power point tracking (MPPT) algorithms based on PV arrays but not PV modules lead to the low output power efficiency of PV arrays. In view of the above questions, this paper analyzes the output characteristics of PV arrays under...
In recent years, the increase of energy demand and the problems of fossil-fuel sources due to their environmental pollution and future shortages, have led to the development of technologies need to use non-polluting alternative energy sources such as solar and wind sources. Growing demand, advancements in semiconductor technology and magnetic materials such as high frequency inductor cores, has a...
For large, utility scale, PV systems a two-stage PV power conversion with distributed dc-dc conversion at the string level and a central inverter can provide significant improvement in PV generation in the face of mismatched panels and uneven irradiation (e.g. shading, clouds and soiling ). Such a system has been developed with funding under the U.S. Department of Energy SEGIS program. This paper...
This paper proposes a new multi-input dc boost converter for grid-connected hybrid Photovoltaic (PV)/Fuel cell (FC)/Battery power system, supplying a residential load. In this structure each switching cycle of proposed boost converter is divided in to five switching periods in comparison with conventional structure. These switching periods introduce five different duty ratios for the proposed boost...
This paper proposes an approach for the control and optimization of power flow by integrating Plug-In Hybrid Vehicles (PHEV) to an existing residential photovoltaic system. Optimization of Power flow reduces the dependency for electric power from the grid and control involves determining the source from which residential load will be catered. The system built to achieve the goal is a combination of...
With the application of renewable energy, the distributed energy network is researched and developed widely. This paper designed the distributed stand-alone PV generating system with battery backup. The coordinated MPPT control of several parallel modules is designed to increase PV utilizing efficiency. The multi-variable multi-loop controller is designed to control the currents of each module, the...
The aim of this paper is to discuss new alternatives for three-phase grid connected photovoltaic systems featuring harmonic compensation capability. The conventional and other five different topologies are presented and explained emphasizing the advantages and disadvantages in a scenario where current harmonic compensation is required. The topologies are based in the parallel operation of two grid-connected...
The energy storage devices are necessary to the stand alone PV generation system. Lead acid battery which performance is specially designed is suitable for PV generation application. The battery charging and discharging control with the max power of PV array is the key point to increase efficiency of the generation system. In this paper, the new system configuration with parallel battery charger is...
It has been demonstrated that performing localized maximum peak power tracking (MPPT) on each photovoltaic (PV) panel, instead of using a single MPPT controller across the PV string can substantially increase the total harvested power, since each panel experiences unique illumination and temperature conditions. In this work, the effect of the dc-dc converter efficiency on the power savings from distributed...
This paper proposes a high gain and high efficiency power conditioning system for grid connected PV module. The system consists of a one module of PV, boost converter with high gain transformation ratio, and singlephase H-bridge inverter. The system is suitable for using less number of PV modules or using only one PV module for the grid connection applications which called ac modules. Since the controller...
The key to expand PV application is cost cutting and performance enhancing for the extensive application of stand-alone PV generation system. In this paper, the improvement of general efficiency is considered. The new configuration with several DC-DC modules is designed. The conversion steps are decreased and system conversion efficiency is increased. The dual-module MPPT coordinate control is designed...
The power available at the output of photovoltaic (PV) cells keeps changing with solar irradiation and ambient temperature because PV cells exhibit a nonlinear current-voltage characteristic. Maximum power point tracking (MPPT) techniques are used in PV systems to make full utilization of PV array output power which depends on solar irradiation and ambient temperature. Inverter control is another...
This work presents the design of a sliding-mode based current controller for a Cascade Full Bridge Multilevel Inverter grid connected PV system. The design also includes a modulation strategy to share the control action among the cascade-connected bridges in order to concurrently synthesize a multilevel waveform and to keep each of the PVG at its maximum operating point. Experimental results are included...
Photovoltaic power supplied to the utility grid is gaining more and more visibility while the world's power demand is increases. Growing demand, advancements in semiconductor technology and magnetic materials such as high frequency inductor cores, has a significant impact on PV inverter topologies and their efficiencies, on the improvement of the control circuits on the potential of costs reduction...
The grid-connected photovoltaic generation system is the most important one in the field of photovoltaic application. In this paper, a model of photovoltaic has been constructed based on the main circuit of single phase grid-connected generation system using MATLAB/simulink to program it. The double closed loop control structure is adopted and forward-feed compensation method is employed to the system...
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