IT7900EP Series High Performance Feedback Grid Simulator

Basic features

♦ Silicon Carbide (SiC) Technology
♦ High power density, up to 21kVA in 3U
Voltage up to 350 VL-N
♦ Efficient energy return
Master-slave equalization, parallel up to more than 1MVA
Built-in rich waveform database
Support single-phase/three-phase/inverted/inverted mode voltage can be extended to 200% rated voltage
Support NORMAL/LIST/SWEEP, any one of these modes can be superimposed with Surge&Sag function.
♦ Touch screen design, simple UI interface
♦ Phase angle 0~360° can be set
♦ Up to 50th harmonic simulation and analysis function, built-in test regulations such as IEC61000-3-2/3-12 *1
Arbitrary waveform output can be simulated, and CSV file imported waveform is supported
♦ Built-in USB/CAN/LAN/Digital IO, optional GPIB/Analog & RS232 Interface
Multiple protection functions, including auto-clear protection, instantaneous overvoltage protection POVP, software watchdog, etc.

Support CANopen, Modbus, LXI, SCPI and other communication protocols.

Source Characteristics

Full four-quadrant feed-back grid simulator
♦ Frequency: 16~2400Hz *3
AC/DC/AC+DC/DC+AC four output modes can be realized
Programmable output impedance to simulate power line impedance
Harmonic/interharmonic waveform synthesis
♦ Satisfy the testing of low voltage ride-through, phase jumps, frequency variations, harmonic injection and other grid-connection regulations.
♦ Built-in IEC61000-4-11/4-13/4-14/-17/4-28/4-29 regulation waveform test
♦ Optional professional software APS4000 series, quickly complete the test of civil avionics and ship-related standards (MIL-STD-704, DO160, B787 ......)

Load Characteristics

Full Four-Quadrant Feedback AC/DC Electronic Load
♦ Frequency: 16-500Hz
♦ Supporting CC/CP/CR/CS/CC+CR/CE multiple working modes in AC mode.
CE mode can simulate 14 circuit topologies such as single-phase rectifier RLC, parallel RLC, etc.
DC mode supports 9 working modes such as CC/CR/CP/CV etc.
AC mode supports both rectified and non-rectified modes
Adjustable crest factor: 1.414 ~ 5.0
Support phase shift function, range -180º~180.0º *6
The unit power factor 1 function allows the current waveform to vary with the voltage waveform and the power factor to be as close to 1 as possible.
Support pumping and unloading angle control, the whole range of 0-359° can be set.

*1 Voltage/current harmonic analysis, voltage harmonic simulation in source mode, current harmonic simulation in carrier mode, fundamental ≤ 60 Hz
*:: 3 Grid simulator and islanding simulation mode, 16-150 Hz
*4 Setting range of phase shift is constrained by peak factor when rectification is turned on

source and carrier in one unit

The IT7900EP series incorporates three devices. Users can choose to use the IT7900EP as a grid simulator with the full functionality of a programmable AC power supply, or as a feed-back AC/DC load, directly from the instrument panel.

Four Quadrant Output Characteristics

The IT7900EP series is not only a full 4-quadrant grid simulator, but also a full 4-quadrant AC/DC electronic load, capable of operating in all 4 quadrants, with good bi-directional capability to extend the simulation range of the traditional equipment which only has 2 quadrants. Combined with the efficient energy return function, it is suitable for testing grid-connected products such as grid-connected photovoltaic inverters for frequency variations, voltage transients and anti-islanding tests.

Efficient energy return

The IT7900EP provides efficient energy return in both AC and DC modes, whether used as a grid simulator or as a load. The energy generated by the object to be tested can be recovered by the IT7900EP and utilized within the plant rather than consumed as heat, providing users with a "green" solution.

Complete mode of operation

Analog utility reproduction and low voltage ride-through (LVRT) testing

Low Voltage Ride Through (LVRT) is the ability of a power generation system to continue to operate without disconnecting from the grid within a certain voltage drop when a voltage drop is caused by a grid fault or disturbance, and even provide a certain amount of reactive power to the system to help restore the system voltage.The IT7900EP series can be edited to meet the test conditions of Low Voltage Ride Through (LVRT), and with its fast response speed, it can meet the LVRT test requirements fully. Meanwhile, the IT7900EP series is equipped with an arbitrary waveform function, and with the LIST function, it can be edited through the panel or programmable software to simulate a variety of grid disturbance waveforms, such as instantaneous dropouts, surges, and slow rises and dips in voltage.