Overview - IEC TR 63534:2025 (Integrating distributed PV into LVDC systems and use cases)
IEC TR 63534:2025 is a Technical Report from the IEC that reviews theoretical approaches and engineering experience for integrating distributed photovoltaic (PV) generation into Low Voltage Direct Current (LVDC) systems. Edition 1.0 (2025-05) surveys converter-level and system-level topics, inventories relevant IEC and national standards, describes real-world LVDC use cases (e.g., Nushima Island, Tongli hybrid AC/DC, Aachen campus, hydrogen generation testbeds, green buildings, Future Tower) and identifies gaps to guide future standard development.
Key topics and technical requirements
- DC interfaces and power converters
- Classification of PV-to-LVDC interfacing architectures and converter topologies.
- Discussion of controllability requirements for PV converters when connected to LVDC networks.
- Islanding detection and fault response
- Algorithms and methods for local PV islanding detection in LVDC contexts.
- Fault ride-through considerations for PV converters during upstream grid disturbances.
- Stability and oscillation suppression
- Stability analysis of PV–LVDC interactions, modelling challenges and stabilization strategies (including virtual impedance and coordinated control concepts).
- Standards coordination and gap analysis
- Inventory of related standards (IEC, IEEE, national) and mapping of where existing documents meet - or fail to meet - LVDC+PV needs.
- Guidelines for evolving standards to support high-penetration distributed PV in LVDC systems.
Practical applications and users
Who benefits from IEC TR 63534:
- OEMs and power converter manufacturers designing front-end and bi-directional converters for PV-to-LVDC connection.
- EPCs and system integrators planning hybrid AC/DC microgrids, building energy systems, islanded communities or campus DC networks.
- Distribution system operators and utilities assessing integration, protection and fault response for LVDC feeders with high PV penetration.
- Standards developers and regulators using the gap analysis and guidelines to update technical requirements and certification schemes.
- Researchers and consultants studying stability, control algorithms, and new LVDC use cases (hydrogen production, green buildings, transport electrification).
Related standards (selected)
- IEEE 1547-2018 (DER interconnection)
- IEC 61727, IEC 61215-1 (PV system characteristics and module qualification)
- IEC-SEG 4 (LVDC applications and safety guidance)
- IEC TR 63282:2024 (LVDC voltages and power quality)
- IEC 62109-1, IEC 62446-1, IEC TS 62257, IEC 60364 series, IEC TS 62786-1
IEC TR 63534:2025 is a roadmap for integrating distributed PV into LVDC networks - useful for practitioners and standards bodies working to enable efficient, safe and stable DC-based renewable energy systems. Keywords: LVDC, distributed PV, PV integration, islanding detection, fault ride-through, power converters, stability analysis, DC interfaces, standards gap.