Interconnecting micro controller for PV systems in Japan

Roof top system, which is the most popular PV system for residential use, has been growing all over the world. In Japan, almost all of the roof top systems have a power conditioner corresponding with the 3 to 4 kW of PV modules. These systems generate their maximum power under the ideal conditions, thus facing to one unified direction with adequate mount angle and without shadow. Generally residential area is bristling with buildings, which cast their shadows on PV arrays each other, and roofs of residences have various figures. Under these conditions, it is said that AC module that tracks each the maximum power operating point by a PV module is effective. This study, a part of "regional consortium R&D program", is focusing on the development of a 100 W class AC module that is suitable for the Japanese grid connection guideline. Our working group WG 2 has developed its controller part. This paper is a final report about the three years\´ activity of WG 2. A new controller and experimental results are introduced. The final conclusion and future view are also presented.