3P4W Grid Interactive PV-BES System with Seamless Transition Capability

For seamless transition of 3P4W (three phase four-wire) grid interactive solar photovoltaic (PV) system, a suboptimal finite impulse response (FIR) filter with approximation based on infinite impulse response filter (IIR) is employed here. The need for power quality improvement is paramount and in order to guarantee an improved PQ, the grid currents are analyzed in covenant with the IEEE-519 standard. For the operation in an off-grid mode, the power transfer is achieved through a voltage controller, which allows the satisfactory operation during standalone mode of operation. The corroboration of the satisfactory system behavior is obtained during various weak grid conditions.