Photovoltaic step-up transformer Capacity selection
06-03 2025 | By:
Photovoltaic boost transformer is a key device in photovoltaic power generation system, and the selection of its capacity directly affects the stability and power generation efficiency of the system. This article will introduce you in detail how to choose the appropriate photovoltaic boost transformer capacity.
1. Understand the needs of photovoltaic power generation system
Before selecting the capacity of Photovoltaic step-up transformer , you need to understand the needs of photovoltaic power generation system first. This includes understanding the total power demand, output voltage requirements, load type, etc. of the system. This information can help you determine the appropriate photovoltaic boost transformer capacity.
1. Calculate the total power demand of photovoltaic power generation system
The total power demand of photovoltaic power generation system refers to the sum of the total rated power of all photovoltaic panels in the system. This value can be determined by consulting the performance parameters of photovoltaic panels or consulting professionals.
2. Determine the output voltage requirement
The main function of photovoltaic boost transformer is to boost the low-voltage DC power (usually 100V-380V) generated by photovoltaic panels to high-voltage AC power (usually 270V-400V) suitable for grid power supply. Therefore, when selecting the capacity of photovoltaic boost transformer, the output voltage requirement needs to be considered. Generally speaking, the output voltage should match the voltage of the local power grid to avoid adverse effects on the grid.
3. Understand the load type
The load types of Photovoltaic step-up transformer mainly include grid-connected and stand-alone types. Grid-connected loads are mainly used to connect photovoltaic power generation systems to the power grid, while stand-alone loads are used to directly supply power to loads. Different types of loads also have different capacity requirements for photovoltaic boost transformers. For example, grid-connected loads require higher short-circuit current capabilities, so this needs to be taken into account when selecting the capacity of photovoltaic boost transformers.
Energy Storage Step-up Substation integrated with Converter
2. Reasonable calculation of photovoltaic boost transformer capacity
After understanding the needs of the photovoltaic power generation system, the capacity of the photovoltaic boost transformer can be reasonably calculated according to the following formula:
Capacity = (total power demand of photovoltaic power generation system + loss) / output voltage
Among them, the loss includes resistance loss and core loss of equipment such as cables and switches. Generally speaking, the loss is about 5%-10% of the total power demand of the photovoltaic power generation system.
3. Choose the right photovoltaic boost transformer model
After calculating the appropriate photovoltaic boost transformer capacity, it is also necessary to select the right model based on the specific product parameters. The following aspects need attention:
1. Rated voltage: should match the output voltage.
2. Rated current: should be greater than or equal to the maximum power demand of the photovoltaic power generation system, but at the same time, the rated current distribution of the parallel components should be taken into account.
3. Short-circuit impedance: should be greater than or equal to 3 times the rated current to ensure the safe operation of the system under short-circuit conditions.
4. Insulation level: should meet the requirements of national or industry standards.
5. Protection level: the appropriate protection level should be selected according to environmental conditions and usage requirements.
IV. Precautions
1. When selecting the capacity of the photovoltaic booster transformer, the actual needs of the system should be fully considered to avoid over-selection or under-selection.
2. During installation and use, pay attention to keeping the photovoltaic booster transformer clean and well-dissipated to ensure its normal operation.
3. Regularly inspect and maintain the photovoltaic booster transformer to detect and solve problems in a timely manner to extend its service life.
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