IT7900P Series High-Performance Regenerative Grid Simulator

The IT7900P series of high-performance regenerative grid simulators provides users with a leading integrated testing solution. The entire series uses silicon carbide (SiC) technology and can be used as a high-power AC power supply, a grid simulator, a four-quadrant power amplifier, and a regenerative AC/DC electronic load.

Basic Features

♦ Utilizes silicon carbide (SiC) technology
♦ High power density, up to 15kVA in 3U
♦ Voltage up to 350 VL-N
♦ Highly efficient energy regeneration
♦ Master-slave current sharing, paralleling up to 960kVA *1
♦ Built-in extensive waveform database
♦ Supports voltage expansion up to 200% of rated voltage in single-phase/three-phase/reverse-phase/reverse-phase modes
♦ Supports NORMAL/LIST/SWEEP modes, with Surge & Sag functionality overlay available in any mode
♦ Touchscreen design, simple UI interface
♦ Phase angle 0~360° adjustable
♦ Up to 50 harmonic simulation and analysis functions, built-in IEC61000-3-2/3-12 and other test regulations *2
♦ Can simulate arbitrary waveform output, supports CSV file waveform import
♦ Current source mode
♦ Built-in USB/CAN/LAN/digital IO, optional GPIB/analog/RS232 interfaces
♦ Multiple protection functions, including automatic clearing protection, instantaneous overvoltage protection (POVP), software watchdog, etc.

♦ Supports CANopen *3 Modbus, LXI, SCPI, and other communication protocols

Source Features

♦ Four-quadrant regenerative grid simulator
♦ Output frequency: 16~2400Hz *4
♦ Power amplifier, suitable for power hardware-in-the-loop (PHIL) testing
♦ Professional island mode testing, supporting R/L/C and active/reactive power settings *8
♦ Can achieve AC/DC/AC+DC/DC+AC four output modes
♦ Multi-channel function, a single unit can simultaneously test 1-3 devices *5
♦ Programmable output impedance, simulates power line impedance
♦ Harmonic/interharmonic waveform synthesis
♦ Frequency and phase lock functions, enabling 6-phase/12-phase power output
♦ Meets grid code tests such as low voltage ride-through, phase jump, frequency variation, and harmonic injection
♦ Built-in IEC61000-4-11/4-13/4-14/4-28 and other regulatory waveform tests
♦ Provides rich trigger configurations, synchronously captures the device voltage waveform, and realizes data acquisition and simulation functions
♦ Optional professional software APS4000 series for quick completion of tests for civil aviation electronics and ship-related standards (MIL-STD-704, DO160, B787…)
 

Load Features

♦ Four-quadrant regenerative AC/DC electronic load
♦ Output frequency: 16-500Hz
♦ In AC mode, supports CC/CP/CR/CS/CC+CR/CE multiple operating modes,
♦ CE mode can simulate 14 types of circuit topologies such as single-phase rectifier RLC and parallel RLC
♦ In DC mode, supports CC/CR/CP/CV and other 9 operating modes
♦ In AC mode, supports both rectifier and non-rectifier modes
♦ Adjustable crest factor: 1.414 ~ 5.0
♦ Supports phase shift function, range -180º~180.0º *6
♦ The unit power factor 1 function allows the current waveform to change with the voltage waveform, making the power factor as close to 1 as possible
♦ Supports load shedding and removal angle control, 0-359° full range adjustable

*1 Up to 64 units can be paralleled for 3U models
*2 Voltage/current harmonic analysis, voltage harmonic simulation in source mode, current harmonic simulation in load mode, fundamental frequency ≤60Hz
*4 16~150Hz in grid simulation and island simulation modes
*5 Single-phase models do not have multi-channel functionality
*6 When the rectifier function is enabled, the phase shift setting range is constrained by the crest factor
*8 This function is not supported in multi-channel mode

Product Functions and Advantages

Integrated Source and Load

The IT7900P series integrates three devices. Users can directly select on the instrument panel to use the IT7900P as an IT7900 power grid simulator, possessing all the functions of the programmable AC power supply IT7800, or as a regenerative AC/DC load IT8200.

Four-Quadrant Output Characteristics

The IT7900P series is not only a full four-quadrant power grid simulator but also a full four-quadrant AC/DC electronic load, capable of operating in all four quadrants. Its excellent bidirectional capability expands the simulation range beyond the two-quadrant limitation of traditional devices. Combined with its highly efficient energy feedback function, it is suitable for testing grid-connected products, such as frequency changes, voltage transients, and anti-islanding tests of grid-connected photovoltaic inverters.

Highly efficient energy regeneration

Whether used as a power grid simulator or a load, the IT7900P provides highly efficient energy feedback in both AC and DC modes. The energy generated by the device under test during testing can be recovered by the IT7900P and directly utilized within the factory, rather than being consumed as heat, providing users with a "green and energy-saving" solution.

Professional Islanding Test Mode, Meeting Anti-Islanding Effect Test Requirements

Anti-islanding protection is one of the essential tests for grid-connected inverters. The IT7900P series has a built-in anti-islanding protection test function, allowing testers to set the active power of resistor R, the reactive power of inductor Q and capacitor C, or to simulate grid resonance using resistor R, inductor Q, and capacitor C to test the anti-islanding protection function of grid-connected inverters. The IT7900P islanding test mode simplifies the testing process, improves testing efficiency, and completes the testing of the anti-islanding protection function during the R&D and factory testing of grid-connected inverters.

Data Acquisition and Simulation

The IT7900P series integrates an advanced data acquisition system based on a digital signal processor, providing measurement and waveform analysis capabilities such as digital oscilloscopes, power meters, and digital multimeters. The current measurement accuracy of the entire series is as high as 0.1%+0.2%FS, and the voltage measurement accuracy is as high as 0.1%+0.1%FS. It simultaneously displays up to six oscilloscope curves, saving testing costs and reducing complex connection time. The IT7900P's rich trigger configurations can synchronously capture the voltage waveforms of the device under test, realizing data acquisition and simulation functions. Users can import the acquired abnormal grid voltage data into the IT7900P device to reproduce the grid state and set parameters such as the number of repetitions and offset for the imported waveform.

AC Mains Simulation and Low Voltage Ride Through (LVRT) Test

Low Voltage Ride Through (LVRT) refers to the ability of a power generation system to remain connected to the grid and continue operating, even providing reactive power to help the system restore voltage, within a certain voltage drop range when grid faults or disturbances cause voltage dips. The IT7900P series can edit the test conditions for LVRT, and its fast response speed fully meets LVRT test requirements. At the same time, the IT7900P series has an arbitrary waveform function and, using the LIST function, can simulate various grid disturbance waveforms such as instantaneous power outages, surges, and slow voltage rise and fall through the panel or control software.