Power conditioner team

under constracution


A new type AC inverter  

Many kinds of residential PV systems have been developed, mounted and increasing on a lot of houses. These systems are generally classified into two types, one of them has DC (direct current) wiring and one inverter, the other one called AC module has AC (alternative current) wiring and a module integrated converter (MIC) behind each PV module. In Japan, almost all of the roof top systems belong to the former one. In this type, DC wires of PV modules are connected in series and/or in parallel to a power conditioner with 3 kW to 4 kW capacities. It is known that partially shaded modules perform as resistance component, which reduce the total output power of the series/parallel connected modules. The same is applied to another case in which several PV modules have different characteristics by means of the difference of irradiation and so on. Residential areas are usually bristling with buildings and plants, which often cast their shadows on roof mounted PV arrays. Furthermore, roofs of residential houses are in various shapes and sizes, therefore the generated power from each PV module is different by the part on a roof. Against these problems, it is said that AC module is effective, which tracks the maximum power operating point by each PV module.

An evaluation and development of MPPT control  

Digital inverter  

Copyright(C) Kosuke KUROKAWA Laboratory, Tokyo University of Agricluture and Technology (TUAT). All rights reserved.