### ENHANCING THE LVRT CAPABILITY OF GRID CONNECTED PV SYSTEM UNDER DISTURBED CONDITIONS USING A NOVEL APPROACH

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#### Abstract

Nowadays, the occurrence of low voltages or voltage sags is a common challenge during the operation of a three-phase grid-connected photovoltaic (PV) system. This research paper proposes an innovative approach to enhance the low voltage ride-through (LVRT) capability of such systems. The novel strategy proposed here relies on the concept of eliciting active components (EAC) which involves injecting active power during voltage sags, generating reference currents to operate the voltage source inverter and additionally incorporating an active component algorithm for maximizing the power point tracking from the PV array. The system considered for simulation considers a PV module with a** **maximum power of 382.9 W. The faults considered for the discussion are Line-Line-Line (LLL), Line-Line (LL), Line-Line-Ground (LLG) and Line-Ground (LG) faults. The approach also considers low grid voltage and frequent grid voltage fluctuation. The efficiency of this novel control method is evaluated in terms of fault clearance time and is further compared to the traditional controllers in compliance with the Indian grid code LVRT requirements. The obtained results indicate that this approach significantly reduces fault clearance time by 69.6% and 20.08% for LLG fault & 88.8% and 72% for LG fault in comparison to SRFT and SOGI control strategy, respectively. It also enhances DC link voltage stability in comparison to conventional control strategies during low voltage conditions. The approach ensures that the photovoltaic system remains connected without interruption during fault periods.

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