Three-port Micro-inverter With Power Decoupling Capability For Photovoltaic (pv) Systems Applications

The Photovoltaic (PV) systems have been realized using different architectures, starting with the string and centralized PV system to the modular PV system. Presently, decentralized inverters are being developed at the PV panel power level (known as AC – PV Modules). Such new PV systems are becoming more attractive and many expect this will be the trend of the future. The AC-Module PV system consists of an inverter attached to one PV panel. This integration requires that both devices have the same life-span. Although, the available commercial inverters have a relatively short life-span (10 years) compared to the 25 –year PV. It has been stated in literature that the energy storage capacitor (electrolytic type) in the singlephase inverter is the most vulnerable electronic component. Hence, many techniques such as (power decoupling techniques) have been proposed to solve this problem by replacing the large electrolytic capacitor with a small film capacitor. This thesis will present a quick review of these power decoupling techniques, and proposes a new three-port micro-inverter with power decoupling capability for AC-Module PV system applications

Single-Phase Inverter and Rectifier for High-Reliability Applications

With the depletion of fossil fuels and skyrocketed levels of CO_(2) in our atmosphere, Renewable Energy Resources, generated from natural, sustained, clean, and domestic resources, have caught the eye in recent years of both the industries and governments worldwide. In addition to finding these energy resources, new technologies are being sought to improve the efficiency of consuming the generated energy. Power Electronics is the key technology for both generation and the efficient consumption of energy. The recent trend in power electronics is to integrate the electronics into the source (Photovoltaic (PV)) or the load (light). For PV and outdoor lighting applications, this imposes a harsh, wide-range operating environment on the power electronics. Thus, the reliability of power electronics converters becomes a very crucial issue. It is required that the power electronics, used in such environments, have reliability indices, such as lifetime, which match with the source or load one. This eliminates the reoccurring cost of power electronics replacement. Relatively high efficiencies have been reported in the literature, and standards have been developed to measure it. However, the reliability aspect has not received the same level of scrutiny. In this study, two main aspects have been investigated: (1) A new methodology to evaluate the integrated power electronics that becomes more involved task; and (2) new topology and control schemes, for the single-phase DC/AC and AC/DC converters, which will improve the reliability. The proposed methodology has been applied for different PV Module-Integrated-Inverter (MII) that employs different power decoupling techniques. The results showed that the decoupling capacitor is the limiting lifetime component in all the studied topologies. Moreover, topologies use film capacitor instead of electrolytic capacitor showed an order of magnitude improvement in the lifetime. This clearly suggests that replacing the electrolytic capacitor by a high-reliability film capacitor will enhance the reliability of the PV MII. In the second part of this study, the ripple-port concept is applied for the single-phase DC/AC inverter and AC/DC rectifier, which allows for the usage of the minimum required decoupling capacitance. In conclusion, film capacitor can be used, which led to the improvement of the overall reliability and lifetime

Bifurcation And Chaos Of Dc-Dc Converter As Applied To Micro-Inverter With Multi Control Parameters

In general, DC-DC converter is a highly nonlinear system. More than one decade ago, many researchers have approved that DC-DC converters are experiencing bifurcation and chaotic oscillations. In this paper, both DC-DC Buck and Boost converters are been studied and analyzed. The study showed that such DC-DC converters are experiencing a nonlinear behavior (chaotic behavior) under certain operation conditions. In this paper, we studied the bifurcation and chaos in the DC-DC buck converter with changing different control parameters. In addition, the bifurcation theory will be applied to DC-DC Boost converter. Bifurcation diagrams and state-space diagrams have been shown for changing some control parameters

Chaos And Bifurcation Of Voltage-Mode-Controlled Buck Dc-Dc Converter With Multi Control Parameters

In general, DC-DC converter is a highly nonlinear system. More than one decade ago, many researchers have approved that DC-DC converters are experiencing bifurcation and chaotic oscillations. In this paper, DC-DC buck converter is been studied and analyzed. The study showed that such DC-DC buck converter is experiencing a nonlinear behaviour (chaotic behaviour) under certain operation conditions. In this paper, we studied the bifurcation and chaos in the DC-DC buck converter by changing different control parameters. Bifurcation diagrams and state-space diagrams have been shown for these parameters

Three-port micro-inverter with power decoupling capability for Photovoltaic (PV) system applications

This paper proposes a new single-phase inverter topology for Photovoltaic (PV) applications. The capability of decoupling the double-line-frequency ripple, using a small capacitance, is the main feature of the proposed topology. This allows for using a film capacitor instead of an electrolytic capacitor, resulting in higher inverter reliability. Additionally, no extra circuitry is needed to manage the transformer leakage energy. © 2014 IEEE

A Three-Port Flyback For Pv Microinverter Applications With Power Pulsation Decoupling Capability

In this paper we present an experimental approach to study copper and magnesium-doped zinc oxide nanorods and their integration in wavelength-tunable light-emitting diodes (LEDs). © 2012 Lviv Polytechnic Natl Univ

A Three-Port Photovoltaic (Pv) Micro-Inverter With Power Decoupling Capability

This paper presents a new micro-inverter topology that is intended for single-phase grid-connected PV systems. The features of the proposed topology are: (1) eliminating the double-frequency power ripple using small film capacitor; (2) improving the maximumpower-point tracking (MPPT) performance; (3) using long life-time film capacitors, which will improve the reliability of the inverter; and (4) requiring no additional circuitry to manage the transformer leakage energy. © 2011 IEEE

A Review Of Power Decoupling Techniques For Microinverters With Three Different Decoupling Capacitor Locations In Pv Systems

Thereliability of the microinverter is a very important feature that will determine the reliability of the ac-module photovoltaic (PV) system. Recently, many topologies and techniques have been proposed to improve its reliability. This paper presents a thorough study for different power decoupling techniques in singlephase microinverters for grid-tie PV applications. These power decoupling techniques are categorized into three groups in terms of the decoupling capacitor locations: 1) PV-side decoupling; 2) dc-link decoupling; and 3) ac-side decoupling. Various techniques and topologies are presented, compared, and scrutinized in scope of the size of decoupling capacitor, efficiency, and control complexity. Also, a systematic performance comparison is presented for potential power decoupling topologies and techniques. © 2013 IEEE

Power Decoupling Techniques For Micro-Inverters In Pv Systems-A Review

This paper reviews the power decoupling techniques of micro-inverters used in single-phase, grid-tied PV systems. The power decoupling techniques are categorized into three groups: (1) PV side decoupling; (2) DC link decoupling; and (3) AC side decoupling. Various topologies and techniques are presented, compared, and evaluated against the size of capacitance, efficiency and control complexity. Finally, potential topologies and technologies are pointed out as the best options for power decoupling implementation. © 2010 Crown

Design Considerations For Distributed Micro-Storage Systems In Residential Applications

This paper presents some design considerations for distributed micro-storage systems in residential applications. In this paper, the term micro-storage refers to small residential energy storage units with a capacity of few kilowatt-hours. Generally, energy storage systems enhance the performance of distributed renewable generation systems and increase the efficiency of the entire power system. Energy storage allows for leveling the load, shaving peak demands, and furthermore, transacting power with the utility grid. Different micro-storage system architectures as well as analysis of system sizing are discussed in the paper. In addition, different energy storage technologies, inverter design considerations, and smart grid integration issues will be also presented. © 2010 IEEE