Analysis, Design, and Experimental Results of a Novel Soft-Switching Snubberless Current-Fed Half-Bridge Front-End Converter-Based PV Inverter

Abstract—This paper proposes a new novel snubberless currentfed half-bridge front-end isolated dc/dc converter-based inverter for photovoltaic applications. It is suitable for grid-tied (utility interface) as well as off-grid (standalone) application based on the mode of control. The proposed converter attains clamping of the device voltage by secondary modulation, thus eliminating the need of snubber or active-clamp. Zero-current switching or natural commutation of primary devices and zero-voltage switching of secondary devices is achieved. Soft-switching is inherent owing to the proposed secondary modulation and is maintained during wide variation in voltage and power transfer capacity and thus is suitable for photovoltaic (PV) applications. Primary device voltage is clamped at reflected output voltage, and secondary device voltage is clamped at output voltage. Steady-state operation and analysis, and design procedure are presented. Simulation results using PSIM 9.0 are given to verify the proposed analysis and design. An experimental converter prototype rated at 200 W has been designed, built, and tested in the laboratory to verify and demonstrate the converter performance over wide variations in input voltage and output power for PV applications. The proposed converter is a true isolated boost converter and has higher voltage conversion (boost) ratio compared to the conventional active-clamped converter.

(Index Terms—Current-fed converter, high frequency, photovoltaic (PV) inverter, renewable energy system, soft-switching.)

A High-Performance SPWM Controller for Three-Phase UPS Systems Operating Under Highly Nonlinear Loads

Abstract—This paper presents the design of a high-performance sinusoidal pulsewidth modulation (SPWM) controller for threephase uninterruptible power supply (UPS) systems that are operating under highly nonlinear loads. The classical SPWM method is quite effective in controlling the RMS magnitude of the UPS output voltages. However, it is not good enough in compensating the harmonics and the distortion caused specifically by the nonlinear currents drawn by the rectifier loads. The distortion becomes more severe at high power where the switching frequency has to be reduced due to the efficiency concerns. This study proposes a new design strategy that overcomes the limitations of the classical RMS control. It adds inner loops to the closed-loop control system effectively that enables successful reduction of harmonics and compensation of distortion at the outputs. Simulink is used to analyze, develop, and design the controller using the state-space model of the inverter. The controller is implemented in the TMS320F2808 DSP by Texas Instruments, and the performance is evaluated experimentally using a three-phase 10 kVA transformer isolated UPS under all types of load conditions. In conclusion, the experimental results demonstrate that the controller successfully achieves the steady-state RMS voltage regulation specifications as well as the total harmonic distortion and the dynamic response requirements of major UPS standards.

(Index Terms—Inverter, nonlinear load, sinusoidal pulsewidth modulation (PWM) control, uninterruptible power supply (UPS).)

power electronics projects for final year studens

S.NO	TITLES FOR THE PROJECT
1.	A Comparative Study of a New ZCS DC–DC Full-Bridge Boost converter With a ZVS Active-Clamp Converter
2.	A Global Maximum Power Point Tracking Scheme Employing DIRECT Search Algorithm for Photovoltaic Systems
3.	A Maximum Power Point Tracker for Long-Term Logging of PV Module Performance
4.	A Medium-Voltage Motor Drive With a Modular Multilevel PWM Inverter
5.	A Modified Single-Phase Quasi-Z-Source AC–AC Converter
6.	A New High-Efficiency Single-Phase Transformer less PV Inverter Topology
7.	A New MPPT Method for Low-Power Solar Energy Harvesting
8.	A New Single-Phase Single-Stage Three-Level Power Factor Correction AC–DC Converter
9.	A Novel DC-Side Zero-Voltage Switching (ZVS) Three-Phase Boost PWM Rectifier Controlled by an Improved SVM Method
10.	A Novel Method for Connecting Multiple Piezoelectric Transformer Converters and its Circuit Application
11.	A Novel PV Micro inverter With Coupled Inductors and Double-Boost Topology
12.	A Novel Single-Phase Five-Level Inverter With Coupled Inductors
13.	A Novel Three-Phase Three-Leg AC/AC Converter Using Nine IGBTs
14.	A Novel Valley-Fill SEPIC-derived Power Supply Without Electrolytic Capacitors for LED Lighting Application
15.	A Novel ZVZCS Full-Bridge DC/DC Converter Used for Electric Vehicles
16.	A Safety Enhanced, High Step-Up DC–DC Converter for AC Photovoltaic Module Application
17.	A Soft Switching Three-phase Current-fed Bidirectional DC-DC Converter With High Efficiency Over a Wide Input Voltage Range
18.	A State-Space Modelling Approach for the FPGA-Based Real-Time Simulation of High Switching Frequency Power Converters
19.	A Switched-Capacitor Inverter Using Series/Parallel Conversion With Inductive Load
20.	A Switched-Capacitor Voltage Tripler With Automatic Interleaving  Capability

21.	A Three-port Flyback for PV Microinverter Applications With Power Pulsation Decoupling Capability
22.	A Transformer-Less High-Power Converter for Large Permanent Magnet Wind Generator Systems
23.	A Unified Approach to Reliability Assessment of Multiphase DC–DC Converters in Photovoltaic Energy Conversion Systems
24.	A Weighted-Efficiency-Oriented Design Methodology of Flyback Inverter for AC Photovoltaic Modules
25.	A ZVS Grid-Connected Three-Phase Inverter
26.	A ZVS Interleaved Boost AC/DC Converter Used in Plug-in Electric Vehicles
27.	Adaptive Current Source Drivers for Efficiency Optimization of High-Frequency Synchronous Buck Converters
28.	Adaptive Fuzzy-Neural-Network Design for Voltage Tracking Control of a DC DC Boost Converter
29.	An Analog Technique for Distributed MPPT PV Applications
30.	An Improved Maximum Power Point Tracking for Photovoltaic Grid-Connected Inverter Based on Voltage-Oriented Control
31.	An Improved Particle Swarm Optimization (PSO)–Based MPPT for PV With Reduced Steady-State Oscillation
32.	An Integrated Boost Resonant Converter for Photovoltaic Applications
33.	An Interleaved Boost Converter With Zero-Voltage Transition
34.	An Optimized Transformer less Photovoltaic Grid-Connected Inverter
35.	Analysis and Design of a High Step-up Current-Fed Multi resonant DC–DC converter With Low Circulating Energy and Zero-Current Switching for All Active Switches
36.	Analysis and Design of a Push-Pull Quasi-Resonant Boost Power Factor Corrector
37.	Analysis and Implementation of an HPF Electronic Ballast for HID Lamps With LFSW Voltage
38.	Analysis of PWM Z-Source DC-DC Converter in CCM for Steady State
39.	Analysis, Design and Implementation of a Soft Switching Converter with Two Three-Level PWM Circuits
40.	Review of Non isolated High-Step-Up DC/DC Converters in Photovoltaic Grid-Connected Applications

41.	Capacitor Voltage Balancing of Flying Capacitor Multilevel Converters by Space Vector PWM
42.	Cascade Cockcroft-Walton Voltage Multiplier Applied to Transformer less High Step-Up DC-DC Converter
43.	Control of Improved Full-Bridge Three-Level DC/DC Converter for Wind Turbines in DC Grid
44.	Control Structure for Single Phase Stand-Alone Wind Based Energy Sources
45.	Current Phase Surveillance in Resonant Converters for Electric Discharge Applications to Assure Operation in Zero-Voltage-Switching Mode
46.	DC Load and Batteries Control Limitations for Photovoltaic Systems. Experimental Validation
47.	DC/DC Converter Design for Super capacitor and Battery Power Management in Hybrid Vehicle Applications—Polynomial Control Strategy
48.	Derivation, Analysis, and Implementation of a Boost–Buck Converter-Based High-Efficiency PV Inverter
49.	Design and Application for PV Generation System Using a Soft-Switching Boost Converter With SARC
50.	Design and Implementation of a ZCS-PWM Half-Bridge Boost Rectifier With Output Voltage Balance Control
51.	Design Methodology for a Very High Frequency Resonant Boost Converter
52.	Design of Neutral-Point Voltage Controller of a Three-level NPC Inverter with Small DC-Link Capacitors
53.	Direct Connection of Super capacitors to Photovoltaic Panels With On–Off Maximum Power Point Tracking
54.	Distributed Control of a Fault Tolerant Modular Multilevel Inverter for Direct-Drive Wind Turbine Grid Interfacing
55.	Dynamic Modelling and Controller Design for a Single-Stage Single-Switch Parallel Boost-Fly back–Fly back Converter
56.	Dynamic Properties of Current-Fed Quadratic Full-Bridge Buck Converter for Distributed Photovoltaic MPP-Tracking Systems
57.	Feed-Forward Compensator of Operating Frequency for APWM HB Fly back Converter
58.	Frequency Response Analysis of Current Controllers for Selective Harmonic Compensation in Active Power Filters
59.	Grid-Connected Boost-Half-Bridge Photovoltaic Micro inverter System Using Repetitive Current Control and Maximum Power Point Tracking
60.	High Step-up Boost Converter Integrated With a TransformerAssisted Auxiliary Circuit Employing Quasi-Resonant Operation

61.	Multilevel Current Waveform Generation Using Inductor Cells and H-Bridge Current-Source Inverter
62.	Newly-Constructed Simplified Single-Phase Multistring Multilevel Inverter Topology for Distributed Energy Resources
63.	No dissipative String Current Diverter for Solving the Cascaded DC–DC Converter Connection Problem in Photovoltaic Power Generation System
64.	High-Efficiency and Low-Cost Tightly Regulated Dual-Output LLC Resonant Converter
65.	High-Efficiency MOSFET Inverter with H6-Type Configuration for Photovoltaic Non isolated AC-Module Applications
66.	Highly Efficient Analog Maximum Power Point Tracking(AMPPT) in a Photovoltaic System
67.	High-Performance Control of a DC–DC Z-Source Converter Used for an Excitation Field Driver
68.	High-Power Bidirectional DC–DC Converter for Aerospace Applications
69.	High-Step-Up and High-Efficiency Fuel-Cell Power-Generation System With Active-Clamp Flyback–Forward Converter
70.	Hybrid-Frequency Modulation for PWM Integrated Resonant Converters
71.	Improved Transformer less Inverter With Common-Mode Leakage Current Elimination for a Photovoltaic Grid-Connected Power System
72.	Interleaved High Step-Up Converter With Winding-Cross-Coupled Inductors and Voltage Multiplier Cells
73.	Inverse Watkins–Johnson Topology-Based Inverter
74.	Isolated Buck–Boost DC/DC Converters Suitable for Wide Input-Voltage Range
75.	Limits of Advisability for Master–Slave Configuration of DC–AC Converters in Photovoltaic Systems
76.	Low-Cost Semi-Z-source Inverter for Single-Phase Photovoltaic Systems
77.	LVRT Scheme of PMSG Wind Power Systems Based on Feedback Linearization
78.	Maximum Power Point Tracking for Photovoltaic Optimization Using Ripple-Based Extremum Seeking Control
79.	Modeling and Control of a New Three-Input DC–DC Boost Converter for Hybrid PV/FC/Battery Power System
80.	Modulation Technique to Reverse Power Flow for the Isolated Series Resonant DC–DC Converter With Clamped Capacitor Voltage