Abstract
This papers presents the control of a single phase photovoltaic (PV)-battery energy storage (BES) based hybrid system with seamless transfer and power quality (PQ) improvement features. The PV-BES based single phase system provides uninterruptable power to the dedicated nonlinear loads even under utility outage, by transferring smoothly to the islanding. Therefore, the smooth transfer from the grid integrated operation to the islanding and vice-versa, provides high reliability of the system than the conventional system. To control the proposed synchronized system in grid integrated mode, a learning quantization (LQ) based current control with PV feed forward (PVFF) loop, is used. The LQ current control extracts the net active component of the load current. Moreover, PVFF is included in LQ control to reflect the PV power contribution in the utility, which also increases the fast tracking ability of proposed control at variable climate conditions. In islanding operation, the load voltage is regulated by the voltage control. The effectiveness of LQ based current control for single phase PV-BES-Utility synchronized system is demonstrated through the experimental results.
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