Improved and Reliable Performance of Solar PV Systems Requires Energy Storage Technology

Abstract

At present large rating solar photovoltaic (PV) plants are now being installed worldwide. As these plants face the challenge of non dispatchable power in comparison to conventional, researchers has focused on energy storage technology. An energy storage technology not only provides the uninterrupted power supply but also reduces the chance of disconnection from load thus better reliability and robustness in combination with these systems. In this Paper an attempt is made to mimic the entire operation from designing of 5.2 kWp DC to AC system without storage, which supplies the power to a 5KVA load. The PSIM model of this system compared ‘with’ and ‘without’ storage technology for 0.9 sun, 0.6 sun and 0.3 sun radiation. The observations are that at 0.9 sun, 3.97 kW power delivered to load and storage is not required .The PF and CUF in this situation are 78% and 18% respectively. While at 0.6 sun the power delivered to load is 3.68W, the PF and CUF in this situation are 72% and 16% respectively .i.e. partial storage of 460 Ah is required. At another radiation of 0.3 sun, the power delivered is 2.19 kW, the PF and CUF in this situation are 55% and 10% respectively so a key role is played by storage of 1183Ah. It is seen that Volatge and Current THD also increses in absence of storage while these values remains constant in presence of storage system.   For the given DC/AC standalone system, the storage capacity proposed of 5228 Ah for complete 08 hours. Due to these extended operational hours performance and reliability is increased with robustness