A PV Array Fed BESS Supported Speed Sensor-less PMSM Driven Water Pumping System

This work proposes an effective power transfer scheme between two stage solar photovoltaic (PV) array and battery energy storage system fed field oriented controlled permanent magnet synchronous motor drive for water pumping. Owing to real situation where solar insolation is constantly changing and constant water supply is required, a BESS is employed to provide the excess power. Moreover, at the time when no pumping is required, PV power can be fed to the battery. A maximum power point tracking algorithm is used to extract optimum power from the PV array. The PV array is operated at maximum power point ensuring its full utilization until the battery charging current is within safe limit. Above it, the MPPT algorithm de-rates itself and bring the charging current within safe limit. Moreover the proposed algorithm stops energy harvesting from PV array when battery is fully charged and water pumping is not required. A sensor-less field-oriented controlled PMSM is used to drive the PMSM. The applicability of overall system constituting BESS in conjugation with PV array fed PMSM coupled water pump is validated on a hardware prototype developed in the laboratory.