In this evolution, the POWER SHELF is shifting from a simple power distribution unit into a critical hub in data center power systems. Under the OCP ORV3 specification, a power shelf can deliver up to 33 kW or even 72 kW within a 10U form factor, providing centralized power management and distribution for multiple servers. This evolution introduces unprecedented technical challenges for power shelf development and production testing.

2. Test Architecture and Key Challenges of AI Server Power Shelf Systems

For power shelf testing, the ITECH solution uses a regenerative grid simulator on the input side for grid emulation and energy recycling, such as the IT7900E series regenerative grid simulator. On the output side, high-speed dynamic loading is required to validate fast transient response and high dynamic load conditions, using high-power high-speed DC electronic loads such as the IT8100A/E series.

HVDC 800V Output Power Shelf Test Architecture

Test Challenge 1: MW-Level System Testing

Power racks can reach total power levels above the megawatt (MW) range, which requires multi-unit parallel testing systems. This introduces two key challenges: current sharing accuracy and consistency of dynamic response across parallel units.

Test Challenge 2: Ultra-High Dynamic Response Under 160% Surge Load

AI training workloads exhibit pulse-like power consumption. GPU load can shift from light load to full load within microseconds, with current slew rates reaching tens to over 100 A/μs. The OCP ORV3 specification requires power shelf systems to pass 160% peak load testing for tens of milliseconds, in order to validate voltage sag and recovery performance.

Conventional static or low-frequency dynamic loads cannot reproduce such fast current transitions. Therefore, test equipment must support microsecond-level response and high current slew capability.

Test Challenge 3: Grid Compliance and Power Grid Emulation

The input side of the power shelf connects to a medium-voltage grid and must comply with grid regulations (e.g., IEEE 1547, IEC 61000-3 series). Tests include high/low voltage ride-through, harmonic and interharmonic emissions, voltage dips, and frequency variations.

This requires a grid simulator capable of accurately generating various grid disturbance waveforms, as well as high-precision power analysis capability.

3. ITECH Full-Stack Power Shelf Test Solution

1) High-Dynamic MW-Level Loading: IT8100A/E Series High-Power DC Electronic Load

• High-speed dynamic response: IT8100 provides current slew rates up to 150 A/μs per unit, enabling accurate simulation of AI load transients.
• 1.5× short-duration over-power capability: supports 160% surge load testing with reduced need for additional parallel units.
• MW-level scalability: fiber-optic master-slave parallel operation supports system expansion up to 1.8 MW total power.

2) Full Four-Quadrant Grid Emulation and Energy Recovery: IT7900E Series Regenerative Grid Simulator

• Energy recovery: feeds test energy back to the grid, significantly reducing power consumption and thermal load in MW-level testing.
• Grid compliance testing: supports IEC61000-4-11 / -4-13 / -4-14 / -4-17 / -4-28 / -4-29 test waveforms.
  Includes harmonic simulation up to 50th order, LIST/SWEEP/SURGE/SAG modes, programmable output impedance, and support for LVRT, phase jump, and frequency variation testing.

In addition to the above power shelf test solutions, ITECH also provides full-scope test coverage for AI server power systems, including PSU modules, BBU battery backup units, DC/DC converters, and rack-level power distribution systems. This covers the entire validation chain—from PSU input harmonic and surge testing, to BBU charge/discharge and switchover performance verification.

ITECH provides high-precision, high-dynamic, and highly integrated test instruments across the AI server power ecosystem. From chip-level to rack-level, and from grid to load, ITECH supports engineers in ensuring power reliability for the AI era.