Dissertation > Excellent graduate degree dissertation topics show

Research on Active-Clamp Flyback Type Photovoltaic Grid-Connected Inverter

Author: MoQiong
Tutor: PengFangZheng
School: Zhejiang University
Course: Power Electronics and Power Drives
Keywords: Photovoltaic Grid-connected Inverter FPGA Active Clamp Interleave Efficiency
CLC: TM464
Type: Master's thesis
Year: 2012
Downloads: 383
Quote: 1
Read: Download Dissertation

Abstract


With increasing energy crisis and environment pollution problems around the world, the developments and utilizations of renewable energy are gaining more and more visibility. Solar energy becomes one of the world’s most promising green energy for its clean, environmental friendly, renewable and large reserves. Photovoltaic power generation is one of the main forms of solar energy utilization. As the interface between the PV array and the grid, Inverters determine the general performance of the PV system.This research mainly focuses on the PV grid inverter. First of all, several typical topologies of PV grid-connected inverter are analyzed and compared. Among this, flyback converter with unfolding DC-AC inverter can reach a high efficiency, which becomes the research emphasis.Flyback converters show the characteristics of current source when operating in DCM and BCM, so a current reference can be applied to make the flyback output current half wave sinusoid. Then the inverter switching at line frequency unfolds the rectified current to a sinusoidal one and injects it into the grid. In order to maximize the energy generated by PV array fed into the grid, the peak current control strategy, the MPPT control method and the main circuit topology will be deeply analyzed and optimized.A snubber is necessary to deal with the leakage energy for the two reasons below: a. the leakage energy dissipation accounted for a large proportion in the system; b. the voltage spikes due to the parasitic resonance between the leakage inductor and the parasitic capacitors increase the voltage stress of the primary main power switch. So a digitally controlled active clamp technique applying to the flyback converter with unfolding DC-AC inverter is proposed in this thesis, which can recycle the leakage energy, eliminate the parasitic ring and achieve the soft switching for the main switch. Power rating of the inverter can be increased by interleaved technology. Digitally controlled active clamp interleaved flyback converters are introduced to the PV grid-connected inverter in this thesis.On the basis of theoretical analysis, an 175W experimental prototype of PV grid-connected inverter based on FPGA was constructed. The experimental results demonstrate the performance of the active clamp flyback-type PV grid-connected inverter.

Related Dissertations

  1. Research on Electromagnetic Acoustic Transducer Detection System Based on FPGA,TH878.2
  2. Study on Drive and Control System of Five-Phase PMSM Based on FPGA,TM341
  3. Development of LXI Arbitrary Waveform Generator,TM935
  4. Research on High Efficiency Interior Permanent Magnet Synchronous Motor,TM341
  5. Design of Digital Predistorter for RF Power Amplifier Based on FPGA,TN722.75
  6. Synchronization and Channel Estimation Algorithm in Bursted OFDM System and Its Implementation on FPGA,TN919.3
  7. Performance Analysis of Anti-Multipath Capability in DSSS System and Study on the Compensation Methods,TN914.42
  8. Optimizing and Realising Research on Vedio Compression in TV Guidance System,TN919.81
  9. Research and Hardware Simulation of Multiuser Spread Spectrum Code Acquisition Based on FPGA,TN914.42
  10. Research on Basic Algorithms of Digital Image Processing and Implementation with FPGA,TP391.41
  11. Research of High Speed Image Pre-processing System Based on FPGA,TP391.41
  12. Design of High-Speed Digital Image Acquisition and Interface Based on FPGA,TP274.2
  13. Development of Inductance Sensor Data Acquisition System Based on FPGA,TP274.2
  14. Development of Serial Bus Analyzer Based on Nios,TP274
  15. Development of PMC High-speed Data Transmission Board Design Based on FPGA-RocketIO_X,TP274.2
  16. Development of Pxibus High Performance Digital I/O Module,TP274
  17. Development of LXI Counter,TP274
  18. A High-Speed and Real-Time Data Acquisition System Based on FPGA,TP274.2
  19. A Study about the Stock Index Future’s Influence on the Stock Market,F224
  20. Yunnan Province, human capital, the network structure of critical efficiency factor,F249.27
  21. The Design and Performance Simulation of External Valve Small Displacement Pump,TE933.3

CLC: > Industrial Technology > Electrotechnical > Transformers, converters and reactors > Converter > Inverter
© 2012 www.DissertationTopic.Net  Mobile