A Study of High Resolution Isolated Multi-Level Inverter for Grid-Tie Renewable Generation System by Noh Sik Park Department of Mechatronics Engineering The Graduate School Pukyong National University

A Study of High Resolution Isolated Multi-Level Inverter for Grid-Tie Renewable Generation System 신재생 발전 시스템의 계통 연계를 위한 고정도 절연형 멀티레벨 인버터에 관한 연구 
Advisor: Prof. Soon Jae Kwon 
by Noh Sik Park 
A thesis submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Department of Mechatronics Engineering
The Graduate School Pukyong National University February 2009
 ABSTRACT 
 The objective of this paper is to contribute to the commercialization of high resolution 3 phase multi level inverter that uses new control method which is properto thegreatcapacity inverter used for Grid-tiedRenewable GenerationSystem.Forthispurpose,thebasicoperationprincipleandtypes of the conventional multi level inverter is divided to describe the each merit and demerit, the modulation technique applicable to multi level inverter, the domestic and overseas standard and protecting technology of grid-tied technology which is indispensable to grid-tied inverter. The loss for each factor in 3 phase multi level inverter that uses low-frequency transformer was analyzed with structure of 3 phase multi level, theoretic investigationontheregularspacevectormodulationmethodandanewcontrol technique so as to calculate all loss that may occur in the proposed inverter. Further, this research explained the control technique applied to anti-islanding, an essential function of grid-tied inverter and confirmed outputwaveformandTHDforeachrateofmodulationbyusingMatrap/Simulink so as to check the technical feasibility of multi level inverter using 3 phase low-frequency transformer. As 3 phase multi level inverter in 30kW isolate type was designed, produced and experimented, it was confirmed that the performance which was not inferior to that of the existing 2 level inverter method was embodied. Since there is no particular difficulty in productioncomparedtotheexistingproductswhichareproducedbydepending on many know-hows and less part was technically restricted in producing inverter with capacity larger thanthatof inverter produced forresearch, it presents the possibility of localizing power transformer for Grid-tied RenewableGenerationSystemwhichgetslarger
LINK
http://www.mediafire.com/file/vqs3pl4rkq4ezao/A_Study_of_High_Resolution_Isolated_Multi-Level_Inverter_for_Grid-Tied_Renewable_Generation_System.pdf