Analysis of the photovoltaic cells output power based on the door-connection under mismatch

The traditional methods to solve the PV mismatch problem are using diodes and photovoltaic cells in series and in parallel to compensate voltage and current. Considering the cost of production, it is unrealistic that each photovoltaic cell parallels with one bypass diode. One bypass diode may parallels with dozen or more solar cells. Therefore, the connection of the photovoltaic cells in parallel with bypass diodes is very important. This paper proposes the traditional connection may reduce the whole PV modules output power when the shadow covers partial modules. A new photovoltaic cells connection, named "door-connection", is proposed to solve this problem. The paper analyses the characteristics of the door-connection output power in three typical shadow cases. It is proved that the new connection can improve the output power obviously compared with the traditional connection.