This paper delves into a damping control approach for a photovoltaic (PV) system connected to a weak grid by modifying the inverter control configuration through virtual impedance. High-frequency resonance (HFR) is examined through the modeling of PV system impedance in conjunction with a weak grid.
There are two distinct methods to eliminate the leakage current in the solar PV array system: (i) obstruct the leakage current, (ii) reduce the variation/constant common-mode voltage. The additional diodes/switches are incorporated in the system to obstruct the leakage current by disconnecting the PV array from the grid side network.
The interaction of photovoltaic (PV) systems with a weak network is investigated. This study introduces a virtual impedance-based approach that efficiently minimizes detrimental distortions and harmonics. The performance of the proposed method is verified using different case studies on a 2 MW PV system.
Finally, a simulation model of PV generation connected to weak AC grid is built in PSCAD/EMTDC and the simulation results are used to validate the analysis. Photovoltaic (PV) generation is an important way to address the environmental challenges of generating electricity from fossil fuels.
A small-signal model of photovoltaic (PV) generation connected to weak AC grid is established based on a detailed model of the structure and connection of a PV generation system.
In enhancing the integration of grid-connected PV inverters in weak grid conditions, phase-locked loops (PLLs) and voltage-current controllers are employed. As a result, this gives rise to various multi-temporal stability issues across a broad frequency spectrum for the functioning of large-scale power facilities .