For EPCs and PV system integrators, the mainstream PV system topology follows the chain: “PV modules → combiner boxes → inverters → step-up substation → utility grid”.
At the heart of this step-up substation is the MV/HV step-up transformer — the key grid-interface component connecting the inverter to the utility.
I. Working Principle of the System in the Matching Diagram: The Step-Up Transformer is Essential for Grid Connection
The energy flow logic of the entire photovoltaic system is clear, and the step-up transformer plays a crucial role in the "last mile" of grid connection:
1. Photovoltaic Modules: Collect solar energy and convert it into low-voltage DC power.
2. Combiner Box: Collects DC power from multiple photovoltaic modules and transmits it uniformly to the inverter.
3. Inverter: Converts the combined low-voltage DC power into low-voltage AC power.
4. Step-Up Transformer (Core of the Step-Up Station): Receives the low-voltage AC power output from the inverter and, through electromagnetic induction, boosts the voltage to the grid connection standard (e.g., 10kV/35kV), while filtering harmonics and stabilizing power quality to ensure the power meets grid connection requirements.
5. State Grid: Receives the boosted, compliant power, realizing the benefits of power generation.
II. Step-up Transformer Adapted to this Process: Core Advantage of High Synergy
Our step-up transformer perfectly matches the operational requirements of the system shown in the diagram. Its core advantages focus on "process adaptation + efficient grid connection":
(I) High Synergy with Components in the Diagram
• Adaptation to Combiner Box + Inverter Output: Supports low-voltage AC input with different combiner capacities and inverter models, with voltage ratio tolerance within ±0.5%, avoiding power loss due to equipment incompatibility.
• Grid Connection Compliance: Fully compliant with utility interconnection standards (IEC / IEEE / local grid codes). for grid connection voltage and harmonic content, fully conforming to the access standards at the "State Grid" end in the diagram, ensuring successful grid connection acceptance on the first attempt.
(II) Core Performance (Optimized for the System in the Diagram)
