Photovoltaic grid connection is equipped with isolation transformers, which ensure the stable operation of the system from the dimensions of electrical safety, harmonic suppression, common mode interference, fault protection, and grounding adaptation.
Firstly, achieve electrical isolation between the DC side of the photovoltaic system and the AC side of the power grid, block the injection of DC components into the grid, and prevent DC bias from damaging distribution transformers;
Secondly, isolate common mode voltage from high-frequency interference, suppress switch harmonics of photovoltaic inverters, and improve power quality;
Thirdly, isolate the faulty circuit under fault conditions to prevent DC side leakage and grounding faults from spreading to the power grid, reducing the risk of electric shock and equipment breakdown;
Fourthly, adapt to the floating ground system of photovoltaic arrays and the grounding system of the power grid, solve the problem of potential difference, and ensure the safety and compliance of grid connection.
In short, isolation transformers are key electrical components for the safety barrier and energy optimization of photovoltaic grid connected systems.