The N75500 Series is a high-performance, high-power programmable grid simulator developed by NGI, featuring regenerative power feedback capability and four-quadrant operation capability. Utilizing high power density design, the product delivers up to 25kVA within a compact 3U chassis, with parallel connection capability for flexible scaling to higher power requirements. The N75500 Series supports single-phase, three-phase, reverse-phase，and split-phase output modes, with wide output voltage ranges: up to 350V L-N (line-to-neutral), 606V L-L (line-to-line), and 700V L-L in reverse phase mode. Output modes encompass AC, DC, AC+DC, and DC+AC, enabling simulation of diverse grid conditions. The product incorporates a dedicated islanding test mode, allowing users to simulate grid non-linear loads by programming R, L, C, active power, and reactive power parameters for comprehensive verification of anti-islanding protection performance. Ideal for new energy vehicles, PV inverters, energy storage systems, power electronics, and R&D laboratory applications.
● High power density design delivering 25kVA in 3U chassis, with parallel capability for power expansion
● Harmonic simulation and analysis up to 50th order
● Voltage range: 0–350V (L-N)
● Compliant with IEC 61000-4-11/4-13/4-14 and other regulatory test standards
● Output frequency range: 1–500Hz, with adjustable voltage and frequency
● Programmable switch-on/switch-off phase angle: 0~360°
● Harmonic and inter-harmonic waveform synthesis
● Programmable output impedance
● Single-phase, three-phase, reverse-phase, and split-phase output modes
● Four output modes: AC/DC/AC+DC/DC+AC
● Standard USB/CAN/LAN/RS232/RS485 interfaces, optional GPIB (via RS232 conversion)
● Multiple protocol support: Modbus-RTU, SCPI, CANopen
● Programmable voltage and current slew rates for flexible test adaptation
● 6.8-inch high-resolution LCD display for enhanced readability of test information
Standard Waveform Output: In addition to pure sine wave, the N75500 series features built-in non-standard waveforms including triangle wave, sawtooth wave, square wave, and trapezoidal wave. It also incorporates built-in test standards for IEC 61000-4-11/4-13/4-14/4-27/4-29, enabling evaluation of equipment tolerance under complex grid conditions such as voltage sag/swell, frequency deviation, phase jump, and voltage fluctuation. User-defined waveform output is also supported.
Anti-Islanding Protection Test: The N75500 series features a professional anti-islanding test mode. Users can configure active power (resistance R) and reactive power (inductance Q/capacitance C), or directly set R, L, C parameters to accurately simulate grid resonance, enabling comprehensive verification of the DUT's islanding detection and protection mechanisms to ensure compliance with safety operation requirements. The N75500 transforms complex anti-islanding testing into a safe, efficient, and automated standardized process, significantly improving user test efficiency.
As a full four-quadrant operating unit, the N75500 Series can completely simulate bidirectional energy exchange between the grid and device in any direction. Whether the device absorbs active/reactive power from the grid (Quadrants 1 and 4) or delivers active/reactive power to the grid (Quadrants 2 and 3), precise simulation and measurement are achieved. Ideally suited for testing generators, inverters, rectifiers, and any scenario involving bidirectional power flow.
The N75500 Series not only simulates grid power supply to the DUT, but also absorbs energy delivered by the DUT and efficiently feeds the recovered clean energy back to the local grid (regenerative efficiency up to 90%), significantly reducing test energy consumption and thermal management costs while achieving green energy savings. When operating in energy absorption mode, the N75500 can convert AC or DC output from the DUT (via internal rectification) into pure sine wave current synchronized with the local grid in frequency, phase, then "inject" it back into the grid.
The N75500 Series utilizes high power density design, delivering 25kVA within a 19inch width and 3U height chassis , with parallel expansion capability for flexible scaling to higher power requirements. With 1.7× the output power of conventional AC power sources/grid simulators in equivalent volume, the N75500 Series significantly saves test space in high-power applications, avoiding additional rack installation or laboratory expansion, thereby effectively reducing customer test costs.
The N75500 Series supports independent amplitude and phase programming, capable of simulating harmonics up to the 50th order (fundamental 50Hz/60Hz) to generate periodic distorted waveforms per test requirements. The unit incorporates 30 groups of pre-stored harmonic distortion waveforms for rapid user recall and testing. Supporting single-phase, three-phase, reverse-phase, and split-phase harmonic output, the N75500 Series fully satisfies IEC harmonic immunity test requirements and serves as a critical tool for EMC immunity testing.
The N75500 Series provides comprehensive harmonic analysis functionality, supporting high-precision measurement of voltage and current harmonics. The series measures not only total harmonic distortion (THD), but also accurately captures phase displacement of each harmonic relative to the fundamental, with multi-order harmonic synchronous measurement capability. Test results can be intuitively displayed via data lists, vector diagrams, and other formats, enabling rapid problem identification and in-depth power quality analysis for clearer, more efficient harmonic evaluation.