Adaptive Voltage Stability Recovery in PV-Battery-based Power System under Dynamic Load Variations
Abstract
The rapid integration of renewable energy resources introduces substantial unpredictability and uncertainty into modern power systems, raising concerns about voltage stability and grid optimisation. This paper presents a real-time model and investigation of integrating a hybrid Photovoltaic (PV) and Battery Energy Storage System (BESS) into the IEEE-9 bus system under dynamic load conditions. A decentralised, adaptive PID-based droop voltage control mechanism is proposed to regulate the photovoltaic plant's output power via maximum power point tracking, while leveraging the BESS's fast dynamic response to smooth PV voltage deviations by injecting real and reactive power for rapid voltage recovery. A voltage-following control strategy is established to enable the hybrid system to stabilise bus voltages following sequential load variations. Using the Real-Time Digital Simulator (RTDS), grid-following operation is achieved, improving transient voltage recovery and reducing oscillations, outperforming PV-only integration.
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