Enhancing Integration of Advanced Power Control Strategies for High-Penetration Photovoltaic System in Power Grid

This paper addresses the integration challenges faced by photovoltaic (PV) systems operating in fragmented and weak grid environments, emphasising the need for controllable PV systems that offer stable and intelligent services such as fault boarding and active power compensation to ensure high efficiency and reliability. The study introduces the development of multifunctional PV inverters designed to mitigate reactive and harmonic faults during operation and proposes a low-voltage ride-through (LVRT) control strategy using instantaneous power theory for a grid-connected large-scale PV converter. This control strategy calculates the relationship between the actual measured voltage and current, determining instantaneous active and reactive component values, and generates an inverter-switching pulse signal based on the corresponding designed reference current values, resulting in a better dynamic response when the phase voltage decreases. Simulation methods demonstrate the performance of this approach in an actual stage involving a large-scale practical PV system scenario, and the case studies validate its significance and flexibility in revealing advanced features of PV systems. The proposed solar power control strategy can be standardised in commercial PV inverters, facilitating the online use of different operating modes and enhancing the integration and reliability of PV systems in weak grid environments.

کلیدواژه ها:

Multifunctional inverter ، Low-Voltage Ride-Through (LVRT) ، DSTATCOM ، Photovoltaic System