2026 Photovoltaic Transformer Trends: The Core Hub of Smart Grid and AI Driven Energy Systems

Neglected photovoltaic core equipment

With the continuous explosive growth of global photovoltaic installed capacity in 2026, the industry’s focus is often on modules and inverters, but a key equipment is often overlooked – solar transformers.

In modern photovoltaic systems, transformers not only undertake the basic function of voltage conversion, but also gradually evolve into intelligent, digital, and monitored key node devices, playing a core role in improving grid stability, system efficiency, and energy dispatch capabilities.

What is a photovoltaic transformer?

Photovoltaic transformers are mainly used for:

• Step up the low-voltage AC power (usually 400V-800V) output by the inverter
• Realize long-distance power transmission (such as 10kV-220kV)
• Ensure grid connection safety and electrical isolation

Component	Function
PV Panels	Generate DC electricity
Inverter	Converts DC → AC
Step-Up Transformer	Raises voltage for grid
Switchgear	Controls and protects system
Grid Connection	Power distribution

The main types of photovoltaic transformers

1.Oil immersed transformer

• Suitable for large ground power stations
• Excellent heat dissipation performance
• strong carrying capacity

2.Dry type transformer

• Commonly used in industrial and commercial rooftop photovoltaics
• High safety (oil-free)
• Low maintenance cost

3.Box type transformer (pre installed)

• integrated design
• Easy installation

Comparison Table

Type	Efficiency	Maintenance	Application
Oil-Immersed	★★★★★	Medium	Large solar farms
Dry-Type	★★★★	Low	Buildings
Pad-Mounted	★★★★	Low	Distributed PV

Analysis of Key Technical Parameters

When choosing a photovoltaic transformer, it is important to pay attention to:

Parameter	Description
Rated Power (kVA/MVA)	Capacity of transformer
Voltage Ratio	Input vs output voltage
Vector Group	Phase displacement (e.g., Dyn11)
Cooling Method	ONAN, ONAF, etc.
Impedance	Impacts fault current

2026 Technology Trends: Intelligent Transformers

1.AI predictive maintenance

• Real time monitoring of temperature, oil quality, and load
• Early warning of faults to reduce downtime risks

2.Integration of smart grid

• Realize dynamic load adjustment
• Automatic voltage optimization

3.Digital twin technology

• Building a virtual model
• Optimize operation and maintenance strategies

Design Challenges in Photovoltaic Applications

1.Strong output volatility

• Load instability caused by changes in lighting conditions
• High adaptability design is required

2.High temperature environment

• Regions such as the Middle East and Africa have extremely high temperatures
• Strict requirements for cooling system

3.Harmonic problems

• Inverter generates harmonics
• Affects the lifespan of transformers

Case analysis: 100MW photovoltaic power station

Parameter	Value
Capacity	100 MW
Transformer Type	Oil-immersed
Voltage	0.8kV → 132kV
Cooling	ONAN/ONAF
Efficiency	>99%

How to choose a suitable photovoltaic transformer?

Suggest evaluating from the following dimensions:

• Project scale (kW/MW)
• Installation environment
• Grid connection requirements
• cooling method
• Full lifecycle cost

Luoyang Datang Energy Technology Co., Ltd. is a high-tech enterprise integrating R&D, manufacturing and supply of power equipment such as transformers, new energy components, distribution cabinets and inverters. With technological innovation as the core, we focus on creating high-reliability and high-performance power solutions to serve global customers. With a strict quality control system and international standard certification, we continue to output excellent products and enable customers to build safe and stable power systems.