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Improved Adaptive GI Based Multimode Operational Control of Weak Grid Connected Single Stage SPV-BES-BDDC System

A single-stage single-phase grid interfaced solar photovoltaic (SPV)-battery energy storage (BES) system with seamless multimode transition capability, is presented in this work, to reliably supply local loads. A bidirectional DC-DC converter (BDDC) control facilitates effective regulation of DC link voltage by matching it with peak power voltage of SPV array. In normal grid condition, extra power generated by the SPV array after feeding the local loads, is transferred to the grid and the load demand is fed by the grid during the SPV power insufficiency. In abnormal faulty grid as well as grid outage condition, the system isolates itself from the grid and operates in standalone mode (SAM) continuing the SPV array power generation, without disrupting the local loads. On arrival of healthy grid, the on-line resynchronization of system takes place. The BES provides backup for local loads when both grid and SPV array become incapable to fulfill the load demand. The BES also consumes the extra SPV array power during SAM. Effective control of multifunctional voltage source converter (VSC) facilitates reactive power and harmonics compensation of local nonlinear loads, maintaining sinusoidal grid current. Estimation of oscillation attenuated real time fundamental frequency as well as enhanced harmonics and DC offset rejection capability of improved adaptive generalized integrator (IAGI) filter presented in this paper, enables grid power quality enhancement as per IEEE-519 standard. The system behavior is observed at various operating scenarios, using a model of the system in Simulink environment.