Bidirectional power
Seamless transitions between source and sink operation with regenerative AC and DC load functionality.
KGS – Bidirectional AC/DC Source and Load up to 1,080 kVA
For grid, converter and avionics testing with regenerative load modes and programmable grid disturbances.
The KGS series combines a bidirectional SiC AC/DC source with a regenerative AC/DC load. It covers AC, DC and AC+DC output, power ratings from 15 kVA to 1,080 kVA, and frequencies from DC to 5 kHz for grid simulation and demanding test applications.
Dynamic grid simulation
Programmable voltage, frequency, phase angle and sequences reproduce defined grid events repeatably.
Flexible load models
CC, CP, CR, RLC and RCD modes support linear and non-linear load simulation.
Test-system integration
TFT touch GUI, LAN, RS485, analog control input and SCPI support local and automated workflows.
Personal project consultation
Do you need support selecting the right power supply? Our technical specialists will provide personal advice tailored to your application.
Select the appropriate technical configuration or access product documentation directly.
ART. NO.
Description
Current [A]
Power [P]
Voltage [V]
KGS 15
|
Description
KGS SiC AC/DC source and load, 15 kVA, AC 450 V L-N, DC 636 V, 70 A, DC–5 kHz
|
Current [A]
70
|
Power [P]
15000
|
Voltage [V]
450
|
4Q AC/DC Amplifier
Technical Data
Product category
AC Bidirectional
AC Electronic Load
AC Power Supply
Type of AC source
Current-controlled CC
Source + Load
Single-/Three-phase
KGS 45
|
Description
KGS 45 SiC AC/DC source and load, 45 kVA, AC 450 V L-N, DC 636 V, 70 A/phase, DC–5 kHz
|
Current [A]
70
|
Power [P]
45000
|
Voltage [V]
450
|
4Q AC/DC Amplifier
Technical Data
Product category
AC Bidirectional
AC Electronic Load
AC Power Supply
Type of AC source
Current-controlled CC
Source + Load
Single-/Three-phase
KGS 90
|
Description
KGS 90 SiC AC/DC source and load, 90 kVA, AC 450 V L-N, DC 636 V, 140 A/phase, DC–5 kHz
|
Current [A]
140
|
Power [P]
90000
|
Voltage [V]
450
|
4Q AC/DC Amplifier
Technical Data
Product category
AC Bidirectional
AC Electronic Load
AC Power Supply
Type of AC source
Current-controlled CC
Source + Load
Single-/Three-phase
KGS 135
|
Description
KGS 135 SiC AC/DC source and load, 135 kVA, AC 450 V L-N, DC 636 V, 210 A/phase, DC–5 kHz
|
Current [A]
210
|
Power [P]
135000
|
Voltage [V]
450
|
4Q AC/DC Amplifier
Technical Data
Product category
AC Bidirectional
AC Electronic Load
AC Power Supply
Type of AC source
Current-controlled CC
Source + Load
Single-/Three-phase
KGS 180
|
Description
KGS 180 SiC AC/DC source and load, 180 kVA, AC 450 V L-N, DC 636 V, 280 A/phase, DC–5 kHz
|
Current [A]
280
|
Power [P]
180000
|
Voltage [V]
450
|
4Q AC/DC Amplifier
Technical Data
Product category
AC Bidirectional
AC Electronic Load
AC Power Supply
Type of AC source
Current-controlled CC
Source + Load
Single-/Three-phase
KGS 270
|
Description
KGS 270 SiC AC/DC source and load, 270 kVA, AC 450 V L-N, DC 636 V, 420 A/phase, DC–5 kHz
|
Current [A]
420
|
Power [P]
270000
|
Voltage [V]
450
|
4Q AC/DC Amplifier
Technical Data
Product category
AC Bidirectional
AC Electronic Load
AC Power Supply
Type of AC source
Current-controlled CC
Source + Load
Single-/Three-phase
KGS 360
|
Description
KGS 360 SiC AC/DC source and load, 360 kVA, AC 450 V L-N, DC 636 V, 560 A/phase, DC–5 kHz
|
Current [A]
560
|
Power [P]
360000
|
Voltage [V]
450
|
4Q AC/DC Amplifier
Technical Data
Product category
AC Bidirectional
AC Electronic Load
AC Power Supply
Type of AC source
Current-controlled CC
Source + Load
Single-/Three-phase
KGS 450
|
Description
KGS 450 SiC AC/DC source and load, 450 kVA, AC 450 V L-N, DC 636 V, 700 A/phase, DC–5 kHz
|
Current [A]
700
|
Power [P]
450000
|
Voltage [V]
450
|
4Q AC/DC Amplifier
Technical Data
Product category
AC Bidirectional
AC Electronic Load
AC Power Supply
Type of AC source
Current-controlled CC
Source + Load
Single-/Three-phase
KGS Custom
|
Description
KGS Customized Customized SiC AC/DC source and load, optionally up to 900 V L-N, project-specific configuration
|
Current [A]
10000
|
Power [P]
10000000
|
Voltage [V]
50000
|
4Q AC/DC Amplifier
Technical Data
Product category
AC Bidirectional
AC Electronic Load
AC Power Supply
Type of AC source
Current-controlled CC
Source + Load
Single-/Three-phase
KGS bidirectional AC/DC source and load overview
The KGS series is a modular bidirectional AC/DC power system based on SiC MOSFET PWM technology. It operates as a programmable source or regenerative load and provides AC, DC and AC+DC outputs. The documented power range extends from 15 kVA to 1,080 kVA, while the listed standard models cover KGS 15 through KGS 540. AC applications support up to 450 V L-N and frequencies from DC to 5 kHz. In DC operation, each 15 kW module provides up to 636 V with bidirectional current up to ±70 A per channel. The three phases can be programmed independently or paralleled for a single-phase output. Grid simulation, regenerative load modes, sequences, harmonics and inter-harmonics, plus analog power-amplifier operation make KGS a versatile platform for development, validation and automated test systems.
Key benefits
Source and regenerative load
Bidirectional AC/DC operation enables transitions between delivering and absorbing energy within one system.
Wide frequency range
AC output from DC to 5 kHz and 10 kHz small-signal bandwidth support grid and aircraft-bus simulations.
Independent phases
Voltage, phase angle and other parameters are programmable per phase; paralleling creates a high-current single-phase output.
Repeatable sequences
Multi-step profiles control voltage, frequency, phase angle, ramp and dwell times for dynamic test routines.
Harmonics and inter-harmonics
Up to the 100th harmonic and eight inter-harmonic channels can be edited by amplitude and phase.
Open test-system integration
LAN, RS485, ATI, TTL and SCPI complement local TFT touch operation for automated test systems.
Operating principle and modes
The bidirectional power stage operates as an AC/DC source or regenerative electronic load depending on the test scenario. AC, DC and AC+DC are available in source operation, with CV or CC regulation. Load operation provides CC, CP and CR modes as well as complex RLC and non-linear RCD topologies. A crest factor from 1.414 to 3 can be superimposed on CC and CP load profiles.
| Function | Settings | Technical purpose |
|---|---|---|
| AC source | Voltage, frequency, phase angle, current and power limits, optional DC offset | Defined single- or three-phase supplies and grid events |
| DC source/sink | CV, positive/negative current and power limits, internal resistance | Bidirectional DC testing on three channels |
| Regenerative AC load | CC, CP, CR, crest factor and leading/lagging phase angle | Linear, capacitive, inductive and rectifier-type load conditions |
| RLC/RCD simulation | 12 RLC and 4 RCD topologies, parameterized separately per phase | Repeatable complex and non-linear load emulation |
| ATI power amplifier | Analog setpoint via BNC, ±5 V | Reproduction of external waveforms with no more than 20 µs delay |
Power range and technical characteristics
| Parameter | Value | Condition |
|---|---|---|
| System power | 15 kVA to 1,080 kVA | Modular series range |
| AC voltage and current | 450 V L-N, 70 A | Per 15 kW module, DC to 65 Hz |
| AC range 65–1,000 Hz | 375 V L-N, 70 A | Per 15 kW module |
| AC range 1,000–2,000 Hz | 350 V L-N, 70 A | Per 15 kW module |
| AC range 2,000–3,000 Hz | 250 V L-N, 60 A | Per 15 kW module |
| AC range 3,000–5,000 Hz | 150 V L-N, 50 A | Per 15 kW module |
| DC output | 0–636 V, ±70 A/channel | Per 15 kW module |
| Voltage/current slew rate | ≥5 V/µs / ≥0.5 A/µs | Programmable ramps also available |
| Regulation | 0.1% FS | Load and line regulation |
| Resolution | 0.1 V; 0.01 A; 0.001 kW | Voltage, current and power |
AC accuracy depends on frequency. Between 45 and 70 Hz, voltage, current and power accuracy are each specified as 0.1% FS; the higher values stated in the technical data apply outside this range. AC voltage THD is below 0.3% FS at 15–50 Hz and below 0.4% FS at 50–500 Hz, measured at 250 V L-N with a resistive load.
Standard models
| Model | Power | Max. AC output | Max. DC output | Dimensions W × D × H | Weight |
|---|---|---|---|---|---|
| KGS 15 | 15 kVA | 450 V L-N, 70 A | 0–636 V, ±70 A | 800 × 900 × 1,100 mm | 300 kg |
| KGS 45 | 45 kVA | 450 V L-N, 70 A/phase | 0–636 V, ±70 A | 800 × 900 × 1,500 mm | 460 kg |
| KGS 90 | 90 kVA | 450 V L-N, 140 A/phase | 0–636 V, ±140 A | 900 × 900 × 2,200 mm | 900 kg |
| KGS 135 | 135 kVA | 450 V L-N, 210 A/phase | 0–636 V, ±210 A | 1,600 × 900 × 1,800 mm | 1,050 kg |
| KGS 180 | 180 kVA | 450 V L-N, 280 A/phase | 0–636 V, ±280 A | 1,600 × 900 × 2,200 mm | 1,200 kg |
| KGS 270 | 270 kVA | 450 V L-N, 420 A/phase | 0–636 V, ±420 A | 2,400 × 900 × 2,200 mm | 1,800 kg |
| KGS 360 | 360 kVA | 450 V L-N, 560 A/phase | 0–636 V, ±560 A | 3,200 × 900 × 2,200 mm | 2,400 kg |
| KGS 450 | 450 kVA | 450 V L-N, 700 A/phase | 0–636 V, ±700 A | 4,000 × 900 × 2,200 mm | 2,900 kg |
| KGS 540 | 540 kVA | 450 V L-N, 840 A/phase | 0–636 V, ±840 A | 4,800 × 900 × 2,200 mm | 3,600 kg |
For single-phase operation, the three phase outputs are connected in parallel, tripling the available output current relative to the stated three-phase current per phase. Parallel operation of multiple systems requires identical units with the same power, voltage and current ratings.
Typical applications
PV inverter and grid simulation
Voltage and frequency variations, dips, imbalance and harmonics reproduce defined grid conditions for inverter testing.
Energy-storage PCS
Bidirectional energy flow and programmable grid events support testing of grid-connected power conversion systems.
Avionics power networks
Variable frequency, voltage dips, interruptions and sequences reproduce normal and disturbed aircraft-bus supply conditions.
UPS and converter testing
RLC and RCD topologies generate complex and non-linear loads for testing UPS systems and power converters.
Automated test systems
SCPI, LAN, RS485, analog control and saved sequences simplify integration into ATE and production test stands.
Short-circuit testing
Programmable current limiting and a short-circuit-capable output support defined protection tests, including PV inverter scenarios.
Interfaces, software and installation
| Equipment | Function | Note |
|---|---|---|
| TFT touch GUI | Settings, measurements, harmonic analysis, waveform capture and fault display | 12-inch panel with Windows operating system |
| LAN / RS485 | Remote control and automated routines | RS485 at 9,600 baud, 8N1 |
| ATI | Analog setpoint input for power-amplifier operation | BNC, ±5 V |
| TTL | Trigger signal when voltage or frequency changes | For oscilloscope capture |
| Remote sense | Compensation for voltage drop to the device under test | Connected to the output at the factory |
| Master-slave | Parallel connection of identical systems | Optical communication link |
| Characteristic | Configuration |
|---|---|
| Standard AC input | 3P+N+PE, 380 V L-L ±10%, 47–63 Hz |
| Other input configurations | /400 and /480 for 400 or 480 V L-L ±10%; 3P+N+PE or 3P+PE |
| Options | -BP for bipolar DC output; -HV900 for up to 900 V L-N subject to consultation |
| Cooling and environment | Forced-air cooling; operation at 0–40 °C; 20–90% RH, non-condensing |
| Protection | OVP, OCP, OPP and OTP; IP21; local and external emergency-stop interface |
KGS series FAQ
Which output types does KGS support?
The series provides AC, DC and AC+DC and operates as a source or regenerative load depending on the selected mode.
Is 450 V L-N available up to 5 kHz?
No. 450 V L-N applies up to 65 Hz; the maximum voltage and current decrease in steps as frequency rises.
Which load modes are available?
CC, CP and CR are available, together with twelve RLC and four RCD topologies for complex and non-linear loads.
Is single-phase output possible?
Yes. Paralleling the three phase outputs provides three times the stated three-phase current per phase.
Can multiple systems operate in parallel?
Yes. Master-slave parallel operation is intended for identical units with the same power, voltage and current ratings.
How is KGS automated?
Remote control uses LAN or RS485 and SCPI; ATI analog input and TTL triggering are also available.
Is bipolar DC output available?
Yes. The -BP option adds bipolar DC output, with the appropriate configuration selected for the project.
Can KGS test PV inverters?
Yes. Programmable grid events, low- and zero-voltage ride-through, harmonics and short-circuit conditions support corresponding inverter tests.
Is KGS suitable for energy-storage PCS?
Yes. Bidirectional operation and freely defined grid conditions enable testing of the electrical characteristics of grid-connected PCS.
Can avionics power networks be simulated?
Yes. Variable frequencies, interruptions, abnormal supply conditions, start-up and power-failure scenarios can be reproduced.
Technical consultation and project enquiry
Configuring a KGS system requires the power rating, AC/DC/AC+DC operation, voltage, current and frequency ranges, source and load profiles, phase configuration, AC input, interfaces and options. ET System supports model selection, test-profile definition and system integration.
Discuss your KGS project with ET System