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Updates found with 'photovoltaic'

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Updates found with 'photovoltaic'

IEEE 2016 POWER ELECTRONICS ABSTRACTA BIDIRECTIONAL SINGLE-STAGE THREE PHASE RECTIFIER WITH HIGH-FREQUENCY ISOLATION AND POWER FACTOR CORRECTION ABSTRACT: The use of equipment supplied by dc voltages rated within the range of 380-400 V is currently found in industry, particularly in telecommunications. Besides, the study of dc transmission system has been intensified in the recent literature, mainly due to the widespread use of small electrical grids and the intensive exploitation renewable energy sources such as photovoltaic systems and wind energy conversion systems (WECSs), which rely on dc voltages. With the expansion of the distribution systems in recent decades and the introduction of the smart grid concept, studies focused on topologies with bidirectional capability to manage power flow between the different energy sources (such as wind turbines, photovoltaic modules, fuel cells, among others) and storage systems have been increasingly carried out. Figure presents a typical distribution system composed of high voltage lines and loads supplied by either ac or dc medium and low voltages, while distinct primary sources also exist.EXISTING SYSTEM: A bidirectional version of the topology introduced in without output inductor filter, which is shown in Figure. The converter increases power rating by paralleling phases, not by paralleling multiple devices, and it decreases turn ratio due to a double output voltage by transformer open delta-wye connection. The possibility of direct and indirect power flow is achieved with dual phase-shift (DPS) Considering appropriate angles, it is possible to reduce the reactive content and reduce transformer volume. The duty cycle of the input bridge can be varied to regulate the input voltage and ensure ZVS over the entire operation range. PROPOSED SYSTEM: The proposed converter is shown in Figure, which is based on the DAB converter, since the primary side is composed by a full-bridge converter employing the 3SSC. The use of the 3SSC allows good distribution of losses among the semiconductors and also reduction of high-frequency harmonic content for both voltages and currents. In order to obtain reduced reactive power flow through the transformer windings, the secondary is composed by a similar arrangement using full bridge converters. ADVANTAGES:• Reduction of high-frequency harmonic content for both voltages and currents.• High power density.• High efficiency.: APPLICATIONS:• Photovoltaic systems and wind energy conversion systems.• Smart-grids.• Telecommunications (telecom) power supplies.• More recent applications such as electric vehicles.
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IEEE 2016 POWER ELECTRONICS ABSTRACTA NEW FAMILY OF ZERO-VOLTAGE-TRANSITION NON-ISOLATED BIDIRECTIONAL CONVERTERS WITH SIMPLE AUXILIARY CIRCUITABSTRACT: Bidirectional dc–dc converters (BDCs) have received major attention due to increasing growth of systems in which energy recovery or energy storage systems are required. BDCs are commonly used in a wide variety of applications such as hybrid/electric vehicles (HEVs/EVs), uninterruptable power supplies (UPSs), photovoltaic and fuel cell power systems, and dual-voltage automotive systems. The overall roles of BDCs in such applications are managing power flow, converting voltage level of the energy storage devices, and maintaining energy storage devices health by controlling the charge and discharge current of the energy storage devices. Various BDCs can be divided into non-isolated and isolated types. In applications which isolation and high voltage ratio are not essential, non-isolated BDCs are always applied due to their simple structure and control scheme.EXISTING SYSTEM: A new ZVS based soft switching technique is proposed for Bi-directional direct current to direct current converter. In this converter we will use a single auxiliary Active cir¬cuit. The auxiliary switch, one capacitor and two inductors are used in it. These elements make the circuit simple, which is well accepted Active clamp technique and these are used to operate in Boost/Buck mode with main switches S1 and S2. This con¬verter is made to operate with continuous flow of inductor current, constant frequency is used to turn ON and turn OFF the switches. The conventional method to achieve soft-switching condition in BDCs is to make the converter main inductor current flow in the negative direction. This negative current is used to discharge the snubber capacitor and so, zero-voltage switching (ZVS) is achieved with no auxiliary elements. Besides, the diode reverse recovery losses are completely eliminated. However, using this method, the converter efficiency is greatly reduced at light loads due to the large constant peak-to-peak current swing of the main inductor and almost constant conduction losses. Besides, the converter suffers from high turn-off losses and high current ripple at the input voltage source. In order to minimize the circulating current for a wide converter operating region, nonlinear inductors or variable frequency control is adopted which increases the converter complexity and cost. Besides, to reduce the input current ripple, this method is generally used in multiphase interleaved BDCs which suffer from high component count. PROPOSED SYSTEM: A new family of non-isolated ZVT BDCs is introduced. In the proposed converters, soft-switching condition for all semiconductor elements is provided without any extra voltage and current stresses on the main switches. In comparison with the previously proposed ZVT BDCs, the voltage stress of the auxiliary switches are reduced significantly and so, it is feasible to select switches with low voltage rating and low on-state resistance (RDS(on)) as the auxiliary switches. As a result, both the capacitive turn-on losses and conduction losses of the auxiliary switches are reduced. In addition, by applying the synchronous rectification to the auxiliary switches, conduction losses of the auxiliary switches body diodes are reduced significantly. In the proposed converters, the auxiliary circuit benefits from not requiring floating gate drive circuit and any additional diodes. Also, by using the leakage inductor as the resonance inductor, all the converter inductors could be implemented on a single core. By applying the idea of synchronous rectifiers to store more energy in the resonance inductor, the diode reverse recovery losses are completely eliminated and soft-switching condition is provided for the whole converter operating region. Furthermore, the auxiliary circuit is applied only once in a switching cycle. ADVANTAGES:• Voltage stress of the auxiliary switches are reduced significantly• Diode reverse recovery losses are completely eliminated and • Soft-switching condition is provided for the whole converter operating region APPLICATIONS:• Hybrid/electric vehicles (hevs/evs)• Uninterruptable power supplies (upss), photovoltaic and• Fuel cell power systems, and dual-voltage automotive systems
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IEEE 2016 - 2017 Power Electronics and Power Systems Titles1) Investigation of Negative-Sequence Injection Capability of Cascaded H-Bridge Converters in Star and Delta Configuration2) A Novel Control for a Cascaded Buck Boost PFC Converter Operating in Discontinuous Capacitor Voltage Mode3) A Single-Phase Buck-Boost Matrix Converter with Only Six Switches and Without Commutation Problem4) Adaptive Neuro Fuzzy Inference System Least Mean Square Based Control Algorithm for DSTATCOM5) Average-Value Model of Modular Multilevel Converters Considering Capacitor Voltage Ripple6) LMF Based Control Algorithm for Single Stage Three-Phase Grid Integrated Solar PV System7) Analysis of bi-directional piezoelectric-based converters for zero-voltage switching operation8) A Multi-Level Converter with a Floating Bridge for Open-Ended Winding Motor Drive Applications9) Variable Duty Cycle Control for Quadratic Boost PFC Converter10) Pulse Pattern Modulated Strategy for Harmonic Current Components Reduction in Three-Phase AC-DC Converters11) Practical Layouts and DC-Rail Voltage Clamping Techniques of Z-Source Inverters12) A Low Capacitance Cascaded H-Bridge Multi-Level StatCom13) Impedance networks and its Application in Power for Electric Traction Systems14) Phase Current Balance Control Using DC-Link Current Sensor for Multi-Phase Converters with Discontinuous Current Mode Considered 15) Efficient Single Phase Transformerless Inverter for Grid-Tied PVG System With Reactive Power Control16) Single-Stage High Power Factor Converters Requiring Low DC-Link Capacitance to Drive Power LEDs17) High Efficiency Bi-Directional Converter for Flywheel Energy Storage Application18) Z-Source Resonant Converter with Power Factor Correction for Wireless Power Transfer Applications19) Design of External Inductor for Improving Performance of Voltage Controlled DSTATCOM20) A Single-Switch AC-DC LED Driver Based on a Boost-Flyback PFC Converter with Lossless Snubber21) Control and Analysis of the Modular Multilevel DC De-Icer with STATCOM Functionality22) Combined Phase Shift and Frequency Modulation of a Dual Active Bridge AC-DC Converter with PFC23) Least Power Point Tracking Method for Photovoltaic Differential Power Processing Systems24) Experimental Investigation on a Hybrid Series Active Power Compensator to Improve Power Quality of Typical Households25) Soft Start and Voltage Control of Induction Motors using Floating Capacitor Hbridge Converters26) High Performance Predictive Control of Quasi Impedance Source Inverter27) Analysis of the Integrated SEPIC-Flyback Converter as a Single-Stage Single-Switch Power-Factor-Correction LED Driver28) Matrix Converter Based Active Distribution Transformer29) Universal AC Input High Density Power Adapter Design with a Clamped Series Resonant30) SVM Strategies for Common-Mode Current Reduction in Transformerless Current-Source Drives at Low Modulation Index31) A Single-stage High Frequency Resonant AC/AC Converter32) Analysis and Control of Neutral-Point Voltage for Transformerless Three-Level PV Inverter in LVRT Operation33) A Hybrid-STATCOM with Wide Compensation Range and Low DC-Link Voltage34) A Single-Stage Single-Switch LED Driver Based on Class-E Converter35) Impedance Coordinative Control for Cascaded Converter in Bidirectional Application36) A DC-voltage Controlled Variable Capacitor for Stabilizing the ZVS Frequency of a Resonant Converter for Wireless Power Transfer37) Combined LMS-LMF Based Control Algorithm of DSTATCOM for Power Quality Enhancement in Distribution System38) Interleaved SEPIC Power Factor Pre-Regulator Using Coupled Inductors in Discontinuous Conduction Mode with Wide Output Voltage39) Model Predictive Control Scheme of Five-Leg AC-DC-AC Converter-Fed Induction Motor Drive40) A Virtual RLC Damper to Stabilize DC/DC Converters Having an LC Input Filter while Improving the Filter Performance41) Synchronous Power Controller with Flexible Droop Characteristics for Renewable Power Generation Systems42) A Buck Power Factor Correction Converter with Predictive Quadratic Sinusoidal Current Modulation and Line Voltage Reconstruction43) A Real-time Variable Turn-off Current Strategy for PFC Converter with Voltage Spike Limitation and Efficiency Improvement44) A Common Grounded Z-Source DC-DC Converter with High Voltage Gain45) A Digital Predictive Current Mode Controller for Single Phase High Frequency Transformer Isolated Dual Active Bridge DC to DC Converter46) A High-Voltage Compliant Current-to-Digital Sensor for DC-DC Converters in Standard CMOS Technology47) A New Single-Switch Isolated High-Gain Hybrid Boosting Converter48) A Novel Approach to Generate Effective Carrier-Based Pulsewidth Modulation Strategies for Diode-Clamped Multilevel DC-AC Converters49) A Novel Medium-Voltage Modular Multilevel DC-DC Converter50) A PWM Plus Phase-Shift Controlled Interleaved Isolated Boost Converter Based on Semi-Active Quadrupler Rectifier for High Step-Up Applications51) Analysis and Design of Current-Fed High Step Up PWM Controlled Quasi-Resonant DC-DC Converter for Fuel Cell Applications52) Analysis and Implementation of a Non-Isolated Bidirectional DC-DC Converter with High Voltage Gain53) Capacitor Aging Detection in DC-DC Converter Output Stage54) Derivation of Dual-Switch Step-Down DC/DC Converters with Fault-Tolerant Capability55) Design and Analysis of a High Efficiency DCDC Converter with Soft Switching Capability for Renewable Energy Applications Requiring High Voltage Gain56) Design and Steady State Analysis of Parallel Resonant DC-DC Converter for High Voltage Power Generator57) Digital Control of a High Voltage (2.5 kV) Bidirectional DC-DC Flyback Converter for Driving a Capacitive Incremental Actuator58) Downsizing Effects of Integrated Magnetic Components in High Power Density DC-DC Converters for EV and HEV59) Effective Voltage Balance Control for Bipolar-DC-Bus Fed EV Charging Station with Three-Level DC-DC Fast Charger60) Feed-Forward based Control in a DC-DC Converter of Asymmetric Multistage Stacked Boost Architecture61) High Step-Up/Step-Down Soft-Switching Bidirectional DC-DC Converter with Coupled-Inductor and Voltage Matching Control for Energy Storage Systems62) High-Efficiency Asymmetric Forward-Fly back Converter for Wide Output Power Range63) Isolated Double Step-down DC-DC Converter with Improved ZVS Range and No Transformer Saturation Problem64) Minimum-Current-Stress Scheme of Dual Active Bridge DC-DC Converter with Unified-phase-shift Control65) Model Predictive Control of Capacitor Voltage Balancing for Cascaded Modular DC-DC Converters66) Model Predictive Voltage Control for Single Inductor Multiple-Output DC-DC Converter with Reduced Cross Regulation67) Parasitics Assisted Soft-switching and Secondary Modulated Snubberless Clamping Current-fed Bidirectional Voltage Doubler for Fuel Cell Vehicles68) Stability Analysis and Stabilization methods of DC Microgrid with Multiple Parallel-Connected DC-DC Converters loaded by CPLs69) Steady-State Analysis of Inductor Conduction Modes in the Quadratic Boost Converter70) Suppression of the Peak Harmonics from Loads by Using a Variable Capacitance Filter in Low-Voltage DC/DC Converters71) Topology Derivation and Generalized Analysis of Zero-Voltage-Switching Synchronous DC-DC Converters with Coupled Inductors72) Unified Triple-Phase-Shift Control to Minimize Current Stress and Achieve Full Soft Switching of Isolated Bidirectional DC-DC Converter73) A New Transformerless Buck-Boost Converter With Positive Output Voltage74) Derivation of Dual-Switch Step-Down DC/DC Converters with Fault-Tolerant Capability75) Digital Sensorless Current Mode Control Based on Charge Balance Principle and Dual Current Error Compensation for DC–DC Converters in DCM
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POWER ELECTRONICS ABSTRACT 2016-2017 EFFICIENT SINGLE PHASE TRANSFORMER LESS INVERTER FOR GRID-TIED PVG SYSTEM WITH REACTIVE POWER CONTROL ABSTRACT:There has been an increasing interest in transformer less inverter for grid-tied photovoltaic (PV) system due to low cost, high efficiency, light weight, etc. Therefore, many transformer less topologies have been proposed and verified with real power injection only. Recently, almost every international regulation has imposed that a definite amount of reactive power should be handled by the grid-tied PV inverter. According to the standard VDEAR-N 4105, grid-tied PV inverter of power rating below 3.68KVA, should attain power factor (PF) from 0.95 leading to 0.95 lagging. In this paper, a new high efficiency transformer less topology is proposed for grid-tied PV system with reactive power control.The new topology structure and detail operation principle withreactive power flow is described. The high frequency commonmode (CM) model and the control of the proposed topology areanalyzed. The inherent circuit structure of the proposed topologydoes not lead itself to the reverse recovery issues even when injectreactive power which allow utilizing MOSFET switches to boostthe overall efficiency. The CM voltage is kept constant at midpoint of dc input voltage, results low leakage current. Finally, tovalidate the proposed topology, a 1 kW laboratory prototype isbuilt and tested. The experimental results show that the proposedtopology can inject reactive power into the utility grid without anyadditional current distortion and leakage current. The maximumefficiency and European efficiency of the proposed topology aremeasured and found to be 98.54% and 98.29%, respectively.
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IEEE 2016 POWER ELECTRONICS ABSTRACTA BIDIRECTIONAL THREE-LEVEL LLC RESONANT CONVERTER WITH PWAM CONTROL ABSTRACT: More and more research efforts have been focused on how to use the clean energy in an efficient way in recent years for energy saving and environment protection. The distributed generation systems (DGSs) with clean renewable energy resources like photovoltaic, wind power, and fuel cell are widely adopted around the world. However, the intermittent nature of these clean renewable energy resources may cause fluctuation between power generation and consumption. So energy storage systems (ESSs) are required in DGSs to deal with the intermittent outages and make the system more stable and reliable. Batteries and super capacitors are the most popular energy storage components considering the price and performance. EXISTING SYSTEM The DAB converter has been analyzed extensively with output power above 1 kW and switching frequency below 100 kHz. Under these conditions, resonant intervals responsible for achieving ZVS occupy a sufficiently small percentage of the switching period to allow their exclusion from converter analysis. However, at higher frequencies and lower output power levels, the resonant interval resulting in primary side ZVS corresponds to a significant portion of the switching period and must be included in the analysis of converter operation. This study seeks to examine the nature of this ZVS interval across a full range of load conditions and use the resulting analysis to develop a simple, high-efficiency control strategy for the unregulated DAB converter. But compared with proposed system it has less efficiency.PROPOSED SYSTEM: This project proposes a TL LLC converter with a pulse width and amplitude modulation (PWAM) control method. The switching frequency is constant and equal to its resonant frequency, thus the converter can achieve soft switching for all switches easily. With three different control schemes, the converter can achieve a wide voltage gain. The proposed bidirectional TL LLC resonant converter is shown in Figure, which has a hybrid full-bridge structure with MOSFETS M1–M6 in the transformer primary side and a full bridge structure with MOSFETs Q1–Q4 in the secondary side, D1 and D2 are the body diodes of Q1 and Q2 , D5–D8 are the body diodes of MOSFETM5–M8 , respectively. MOSFETsM1 to M4 are connected in series to form a TL switching leg I, M5 and M6 are series connected to form bridge leg II. “A” and “B” are the midpoints of bridge leg I and II. “C” and “D” are the midpoints of secondary-side full bridge. n is the transformer turns ratio. In order to achieve bidirectional power flow, MOSFETs M7 and M8 are used as clamp switches instead of conventional clamp diodes. The input source V1 is in the transformer primary side, while the energy storage element V2 is in the transformer secondary side. Lr is the resonant inductor, Cr is the resonant capacitor, and Lm is the magnetizing inductor of the transformer. Capacitor C3 is the flying capacitor. The operation principle in forward mode and backward mode are presented. A prototype with maximum 20-A is output current. ADVANTAGES• Different voltage gain achieves different applications• Achieve soft switching for all the power devices• High efficiency APPLICATIONS:• Vehicular applications• Renewable applications
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IEEE 2016 POWER ELECTRONICS ABSTRACT:INTERLEAVED SEPIC POWER FACTOR PRE-REGULATOR USING COUPLED INDUCTORS IN DISCONTINUOUS CONDUCTION MODE WITH WIDE OUTPUT VOLTAGE ABSTRACT: To improve the power quality of the gird, high power factor (PF) and low total harmonics distortion (THD) are required for the grid-connected AC/DC converters. Nowadays, two-stage active AC/DC converters have been widely used in a variety of applications such as onboard chargers for plug-in electric vehicles (PEVs), inductive heating systems, and wireless charging systems. The two-stage AC/DC converters are typically composed of a PFP stage followed by an isolated DC/DC stage. EXISTING SYSTEM: A LLC resonant converter stage follows a boost-type PFP stage. The output voltage of the LLC converter is regulated by pulse frequency modulation. The resonant frequency is the optimal operation frequency associated with the highest efficiency. The operating frequency of the LLC converter moves away from the resonant frequency when the battery voltage is lower than the rated voltage at a lower state of charge (SOC). Consequently, the efficiency of the LLC converter drops significantly. To achieve the highest possible efficiency, i.e. ensure operation at resonant frequency, the input voltage of the LLC converter can be regulated to follow the output battery voltage. Due to the wide variation of the battery pack, the DC-link voltage should be regulated over a wide range and sometimesPROPOSED SYSTEM: A two-phase interleaved SEPIC AC/DC converter with coupled inductors is proposed to serve as the PFP stage with a wide range of output DC-link voltage. The input power is shared evenly between two phases to reduce the current stresses of the switches and diodes; and consequently, the power level can be increased. Since the CCM operation causes large switching losses, the DCM operation is selected to enable soft switching. The ZVS can be realized for the MOSFET’s to reduce the switching losses, while the ZCS can be realized for diodes, D1 and D2, to eliminate reverse recovery losses. In order to reduce the number of magnetic components, the corresponding inductors in two phases are directly coupled. The input current ripple could be significantly reduced through proper design of the coupled inductors.ADVANTAGES:• Reduced Input Current Ripple by Coupled Inductors.• Low harmonic contamination.• Soft switching, galvanic isolation, and high efficiency.APPLICATIONS:• Inductive heating applications.• Standalone photovoltaic systems.• LED lighting systems.• Onboard chargers for plug-in electric vehicles (PEVs).• Wireless charging systems.
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IEEE 2016 POWER ELECTRONICS ABSTRACT:FULL-RANGE SOFT-SWITCHING-ISOLATED BUCK-BOOST CONVERTERS WITH INTEGRATED INTERLEAVED BOOST CONVERTER AND PHASE-SHIFTED CONTROL ABSTRACT: Isolated dc–dc converters are widely required in various applications to meet the requirements of input/output voltage range and galvanic isolation. Generally speaking, isolated converters can be classified into three categories: buck converters, boost converters, and buck-boost converters. Voltage step-down can be implemented with an isolated buck converter, and the efficiency decreases with the decreasing of the voltage conversion ratio. Contrarily, voltage step-up is achieved with an isolated boost converter, and the efficiency decreases with the increasing of the voltage conversion ratio. Therefore, the isolated buck or boost converters are not flexible in terms of conversion efficiency and voltage range. Take the maximum power point tracking converters for renewable power generation systems as an example. Since the open-circuit voltage of renewable sources, such as photovoltaic, fuel-cell, and thermoelectric generator, is much higher than the maximum power point voltage, the highest conversion efficiency is usually achieved at the open-circuit voltage if an isolated boost converter is employed. In this case, high efficiency at the maximum power point, which is very important for the renewable power system, cannot be ensured. For the applications of battery charging and discharging, high conversion efficiency over the entire operating range is needed. Therefore, achieving high-efficiency power conversion in a wide-voltage range is an important research topic, especially for the power systems that are sourced by batteries and renewable energy sources. EXISTING SYSTEMS: An isolated buck-boost (IBB) converter would be a promising approach. Unfortunately, in the past decades, a lot of work has been done for the isolated buck and boost converters, but the research on the IBB converters is still insufficient. Moreover, these single-switch IBB converters can be used only in small-power applications. Although wide-voltage gain range with flexible control can be achieved, it should be noted that the conversion efficiency will be hurt by the cascaded two-stage conversion architecture due to the additional conduction and switching losses. Moreover, the active switches and rectifying diodes on the secondary side are hard-switching, which has negative influence on the conversion efficiency as well.PROPOSED SYSTEM: New method for deriving isolated buck-boost (IBB) converter with single-stage power conversion is proposed and novel IBB converters based on high-frequency bridgeless interleaved boost rectifiers are presented. The semiconductors, conduction losses, and switching losses are reduced significantly by integrating the interleaved boost converters into the full-bridge diode-rectifier. Various high-frequency bridgeless boost rectifiers are harvested based on different types of interleaved boost converters, including the conventional boost converter and high step-up boost converters with voltage multiplier and coupled inductor. The full-bridge IBB converter with voltage multiplier is analyzed in detail. The voltage multiplier helps to enhance the voltage gain and reduce the voltage stresses of the semiconductors in the rectification circuit. Hence, a transformer with reduced turns ratio and parasitic parameters, and low-voltage rated MOSFETs and diodes with better switching and conduction performances can be applied to improve the efficiency. Moreover, optimized phase-shift modulation strategy is applied to the full-bridge IBB converter to achieve isolated buck and boost conversion.ADVANTAGES:• The voltage stresses of the semiconductors in the boost-rectifier are reduced significantly due to the voltage multiplier; hence, low-voltage-rated devices with better conduction and switching performance can be used to improve efficiency.• Soft-switching within the whole operating range have been achieved for all of the active switches and diodes, respectively, by adopting the optimized phase-shift control.APPLICATIONS:• High-output-voltage applications.
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