Kewell G9000NG | Bidirectional AC/DC Power Supply and Electronic AC Load
Simulate grid conditions, test bidirectional energy flow, and utilize recovered energy – for energy-efficient testing of inverters and energy systems.
- ✓ 25 kVA in a single 3U unit
- ✓ AC output up to 450 V (L–N)
- ✓ DC output up to 650 V
Bidirectional AC/DC Source and Regenerative AC Load for Grid Simulation
Kewell G9000NG: Grid and Load Testing for Electrical Systems
Power supply, grid simulation, and load testing in a single instrument: The Kewell G9000NG operates as a programmable AC/DC source, four-quadrant AC grid simulator, and regenerative AC load. AC, DC, and combined AC+DC operation allow test conditions to be configured precisely and the response of devices under test (DUTs) to be evaluated. In load mode, the instrument feeds absorbed energy back into the grid.
Simulating Grid Disturbances and Testing Protection Behavior
As a grid simulator, the G9000NG reproduces voltage sags, overvoltages, frequency variations, and short-duration grid interruptions. It also supports low-voltage ride-through (LVRT) and high-voltage ride-through (HVRT) testing to evaluate how grid-connected equipment responds to voltage deviations. The adjustable short-circuit ratio (SCR) allows engineers to investigate the effects of changing grid conditions on the DUT.
The G9000NG can also reproduce distorted grid voltages and unbalanced three-phase systems. Adjustable harmonics, interharmonics, and individual phase voltages enable testing of DUT behavior under deviations from ideal grid conditions.
In regenerative AC load mode, the G9000NG simulates different load characteristics using adjustable current, power, and resistance settings. Configurable RLC load models support anti-islanding tests to verify the islanding detection capability of inverters and power conversion systems (PCS).
The G9000NG can be integrated into automated test systems. Programmable test sequences and user-defined waveforms enable repeatable testing under consistent conditions.
Enquire now – and define the right test concept together with us
A short technical alignment with our team ensures that the G9000 series is optimally matched to your test tasks.
We support you in selecting the right solution and keep you up to date on current variants, options, and power levels.
Specifications
| Manufacturer Model Number | G9000NG-25K-480-120 |
|---|---|
| AC Apparent Power | 25 kVA in 3U |
| Operating Modes | AC, DC, AC+DC; source and regenerative AC load operation |
| Output Phases | Single-phase or three-phase (synchronized/independent) |
| AC Output Voltage | 0–480 V (L–N), 0–831 V (L–L) |
| AC Output Current | 40 A three-phase, 120 A single-phase |
| AC Output Frequency | 15–450 Hz |
| DC Output | Up to 650 V, 120 A and 25 kW |
| Grid Simulation | Voltage sags, overvoltages, grid interruptions from 1 ms, LVRT/HVRT and adjustable short-circuit ratio (SCR) |
| Harmonics | Up to the 100th order at 40–70 Hz; harmonic content up to 40% |
| Voltage THD (uTHD) | less than 0.3% at 50/60 Hz; less than 1% at 15–450 Hz |
| AC Load Functions | CR, CC, CS, CP, PQ and 14 RLC topologies |
| AC Load Operating Range | 30–480 V, 15–200 Hz |
| Interfaces | RS232 / LAN / USB / Analog I/O / Digital I/O; optional GPIB |
| Peak Efficiency | 90% |
| AC Input | 342–528 V AC, 47–63 Hz, 3L+PE; max. 47.3 A |
| Dimensions (W × H × D) | 445 × 131.5 × 699 mm |
| Weight | 40 kg |
| Operating Temperature | 0 to +40 °C |
| Ingress Protection Rating | IP20 |
Options & Accessories
| GPIB Interface | Optional communication interface |
|---|
Scope of Delivery
| Instrument(s) | 1 × G9000 AC Source-Load System |
|---|---|
| Output Terminal Protective Cover | 1 piece |
| AC Protective Cover | 1 piece |
| Mounting Brackets | 2 sets |
| USB Flash Drive | 1 piece with software and user manual |
| DP014 Connection Cables | 2 pieces for parallel operation |
| Certificate of Conformity | 1 copy |
| GPIB Mounting Plate | 1 piece |
Applications
| Inverters and PCS (Photovoltaics/Energy Storage) | Grid connection, LVRT/HVRT and anti-islanding testing with configurable RLC load models |
|---|---|
| Battery Energy Storage Systems (BESS) | Testing grid-connected power electronics under varying grid and load conditions |
| Charging Infrastructure and E-Mobility | Grid simulation and testing of AC/DC charging systems and associated power electronics |
| Power Quality | Simulation of harmonics, interharmonics and three-phase unbalance, including THD and phase measurements |
| Aerospace | Testing electrical systems under varying frequencies and voltage waveforms |
| Research and Education | Programmable grid and load simulation for development, validation and laboratory experiments |
Links & Downloads
Available Documents (Subject to Change)
Supplier
Kewell Technology Co, Ltd, founded in 2011, is a pioneering manufacturer of intelligent manufacturing equipment and testing solutions for various industries.
The product lines are divided into the following areas:
- Power supplies for test systems
- Hydrogen energy test equipment and intelligent manufacturing equipment
- Power semiconductor and production line test systems
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