Study on photovoltaic power system using orthogonal-core type dc-ac converter

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The purpose of this research is development of the orthogonal-core type dc-ac converter, which is proposed by the author, applicable to practical photovoltaic power system. The results obtained by the study in the time of two years are as follows :1.Development of solar cell simulator : The simulator is constructed with a variable dc-power-supply and diode array. The I-V curves of the trial simulator for the various solar radiation show good agreement with the actual solar cell array.2.Considerations on basic operation of orthogonal-core type dc-ac converter : Using the orthogonal-core type dc-ac converter with small capacity of 400 W,the authors clarify the basic operation of the converter. The simulated and experimental results indicate that the converter has some desirable features for a residential photovoltaic power system.3.Optimum design of the dc-ac converter : The authors present a method for optimum design of the converter. In particular, the authors propose a new analysis method based on a three-dimensional magnetic circuit model of the orthogonal-core. The results are useful for improvement of the dc-ac converter.4.Development of actual dc-ac converter : Based on the above results, the authors made a 3 kW orthogonal-core type dc-ac converter. The efficiency of the trial converter is 90 %. The converter can receive practical application.5.Development of a new applications : In this research, the authors considered new applications of the orthogonal-core. One application is a new variable inductor with sinusoidal output and high speed operation using the orthogonal-core. The variable inductor is useful for a VAR compensator with high performances.The orthogonal-core type dc-ac converter presented here is useful for residential photovoltaic power system because of the converter has desirable features which include simple construction, easiness of maintenance and excellent fault tolerance.