Power Quality and Efficiency Improvements for Transformerless Grid Connected PV Inverters
➤ Gửi thông báo lỗi ⚠️ Báo cáo tài liệu vi phạmNội dung chi tiết: Power Quality and Efficiency Improvements for Transformerless Grid Connected PV Inverters
Power Quality and Efficiency Improvements for Transformerless Grid Connected PV Inverters
USQPower Quality and Efficiency Improvements for Transformerless Grid Connected PV InvertersbyLeslie Alan Bowtell. MEng. BEng. RPEQDissertationSubmitt Power Quality and Efficiency Improvements for Transformerless Grid Connected PV Invertersted in Fulfilment of (he requirementsfor the degree of Doctor of Philosophy ar theUniversity of Southern QueenslandFaculty of Engineering and Surveying November 2010AbstractThere is currently significant growth in the number of residential scale grid-connected photovoltaic (PV) systems. Generally, i Power Quality and Efficiency Improvements for Transformerless Grid Connected PV Invertersf environmental costs are not accounted for, the* cost of generation from PV sources remains high compared to conventionally generated electricity. ThPower Quality and Efficiency Improvements for Transformerless Grid Connected PV Inverters
ere is, therefore, a strong incentive to reduce the cost of PV systems and improve their efficiency while satisfying injected power quality standards.USQPower Quality and Efficiency Improvements for Transformerless Grid Connected PV InvertersbyLeslie Alan Bowtell. MEng. BEng. RPEQDissertationSubmitt Power Quality and Efficiency Improvements for Transformerless Grid Connected PV Invertersand the terminals of the AC network. One of the two main objectives was to investigate the possibility of operating an inverter connected to the AC grid without an interfacing power transformer, while keeping DC injection into the grid below levels specified by Australian and International Standards Power Quality and Efficiency Improvements for Transformerless Grid Connected PV Inverters. A low cost method of controlling the DC offset content of the current injected into the AC mains has been proposed. A mathematical model of the DC oPower Quality and Efficiency Improvements for Transformerless Grid Connected PV Inverters
ffset controller has been developed and experimentally validated. A design procedure for the controller has also been developed. The second objective USQPower Quality and Efficiency Improvements for Transformerless Grid Connected PV InvertersbyLeslie Alan Bowtell. MEng. BEng. RPEQDissertationSubmitt Power Quality and Efficiency Improvements for Transformerless Grid Connected PV Inverters designed tests that unipolar switching meant significantly lower switching losses when compared with bipolar switching. However, the quality of current injected into the AC mains in the case of unipolar switching was not considered acceptable because of significant current distortion near the AC ma Power Quality and Efficiency Improvements for Transformerless Grid Connected PV Invertersins voltage zero crossing. A new method of inverter switching has been proposed which exploits the efficiency advantage of unipolar switching while avPower Quality and Efficiency Improvements for Transformerless Grid Connected PV Inverters
oiding the problem of cun-ent distortion. The main outcomes of this project arc a DC offset controller which allow transformerless operation and an inUSQPower Quality and Efficiency Improvements for Transformerless Grid Connected PV InvertersbyLeslie Alan Bowtell. MEng. BEng. RPEQDissertationSubmitt Power Quality and Efficiency Improvements for Transformerless Grid Connected PV Invertersthe proposed DC offset controller and inverter switching strategy will result in both capital cost savings and higher conversion efficiency.Certification of ThesisI certify that the ideas, experimental work, results, analyses, software and conclusions reported in Illis dissertation arc entirely my o Power Quality and Efficiency Improvements for Transformerless Grid Connected PV Inverterswn effort, except where otherwise acknowledged. I also certify that the work is original and has not been previously submitted for any Ollier award, ePower Quality and Efficiency Improvements for Transformerless Grid Connected PV Inverters
xcept where olherw ise acknowledged.Signature of CandidateDateENDORSEMENTSignature of SupervisorDateSignature of SupervisorDateiiAcknowledgmentsI wishUSQPower Quality and Efficiency Improvements for Transformerless Grid Connected PV InvertersbyLeslie Alan Bowtell. MEng. BEng. RPEQDissertationSubmitt Power Quality and Efficiency Improvements for Transformerless Grid Connected PV Inverters guidance and tactful mentoring from the inception of this project right through to the compilation of this thesis. He has made this a rewarding although sometimes challenging experience for which I am sincerely grateful to have had such a gifted and fervent mentor.I wish also to thank USQ’s technic Power Quality and Efficiency Improvements for Transformerless Grid Connected PV Invertersal staff, in particular Mr Don Gelhaar for his assistance in the Laboratory, and for his kind words of encouragement.It also goes without saying thatPower Quality and Efficiency Improvements for Transformerless Grid Connected PV Inverters
without the continuous support and motivation received from my family, particularly my wife Shelley, that this dissertation would not have been possibUSQPower Quality and Efficiency Improvements for Transformerless Grid Connected PV InvertersbyLeslie Alan Bowtell. MEng. BEng. RPEQDissertationSubmitt Power Quality and Efficiency Improvements for Transformerless Grid Connected PV Invertersand for foregoing all the weekend activities for which I am now once again available.iiiContentsAbstractiCertification of ThesisiiAcknowledgementsiiiContentsivList of TablesixList of FiguresXList of Symbolsxiii Power Quality and Efficiency Improvements for Transformerless Grid Connected PV InvertersUSQPower Quality and Efficiency Improvements for Transformerless Grid Connected PV InvertersbyLeslie Alan Bowtell. MEng. BEng. RPEQDissertationSubmittGọi ngay
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