Abstract
This age is the opening and prosperous age of power electronic technology. The issue of nature resource shortage, Getting-high oil prices and more and more government policy for prohibiting CO2 emission are the evidence. In these sustainable energy resources, solar power plays a very crucial and important role. Usually the lifetime of photovoltaic grid-connected system requires 20+ years of life time. How to increase the lifetime and Higher the efficiency of overall converter is very crucial issue because the power from the photovoltaic panel is extremely valuable. There are two main purposes for this thesis, increasing control performance and the overall operation efficiency of single-phase converter which is suitable for the usage for photovoltaic power. In this thesis the control methodology is going to show in detail. The more accurate synchronous frame control method is proposed. Also, the method for eliminating the twice oscillating power on the gird-connected system under boost based power decoupling circuit is also shown. Final part is showing the efficiency improvement procedure in order to higher the efficiency even under adding power decoupling circuit.