Photovoltaic transformers are key equipment in solar power generation systems. They are mainly used to boost the low-voltage AC power output by photovoltaic inverters to the voltage level required by the grid (such as 10kV, 35kV, etc.), ensuring that the power is efficiently integrated into the grid or used locally.
1. Definition and Function
Photovoltaic transformers are key equipment in solar power generation systems. They are mainly used to boost the low-voltage AC power output by photovoltaic inverters to the voltage level required by the grid (such as 10kV, 35kV, etc.), ensuring that the power is efficiently integrated into the grid or used locally. Its core functions include voltage conversion, electrical isolation, ensuring grid compatibility, and improving system safety.
2. Working Principle
Based on the principle of electromagnetic induction, photovoltaic transformers adjust the voltage through the turns ratio of the primary and secondary coils. For example, if the inverter output is 400V, it can match the medium-voltage grid after being boosted by the transformer, reducing transmission losses. At the same time, the transformer isolates the DC component from the grid to prevent equipment damage.
3. Main Types
Step-up transformer: the most common type, used to boost voltage to grid standards.
Isolation transformer: eliminates DC components and enhances system safety.
Dual-winding/split-winding transformer: adapts to multiple inverter access and improves redundancy.
Environmentally friendly transformer: uses dry or vegetable oil cooling to reduce environmental pollution.
High efficiency and energy saving: The efficiency is as high as 98%-99%, which meets the energy efficiency standards of IEC, GB, etc.
Strong adaptability: It can cope with the intermittent, volatile and harmonic interference of photovoltaic power generation.
High reliability: High temperature and moisture-proof design, adapting to harsh outdoor environment.
Intelligent monitoring: Integrated sensors monitor temperature, load and other parameters in real time, and support remote operation and maintenance.
Large ground power stations: Centralized inverters are equipped with large-capacity transformers (such as 2.5MVA or above).
Distributed photovoltaics: Compact low-noise transformers are used on rooftops or industrial and commercial projects.
Off-grid systems: Provide voltage regulation for energy storage systems or independent microgrids.
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