1. Basic Principles and Testing System of Grid Simulators A grid simulator is essentially a programmable AC power source capable of accurately reproducing various real grid operating conditions. It can also simulate abnormal or extreme grid states. Its core value lies in providing the device under test (DUT) with a controllable, repeatable, and safe test environment, enabling comprehensive evaluation of the DUT’s grid compatibility under laboratory conditions.

In the field of power electronics testing, ITECH has become an important industry player thanks to the excellent performance of its power supplies and electronic load hardware. However, what truly enables this hardware to reach its full potential is a series of carefully developed software solutions from ITECH. These software tools not only compensate for the hardware’s inherent limitations in data logging, but also build a complete ecosystem—from basic testing to complex scenario simulation—through powerful versatility and specialized functions.

As electronic devices continue to pursue higher intelligence and more compact form factors, one of the key pillars of overall system stability—the power management IC (PMIC)—is undergoing a quiet “efficiency revolution.”

With the rapid advancement of battery technology, from consumer electronics to electric vehicles and large-scale energy storage systems, batteries have become the core energy carrier, making their performance testing increasingly critical. A battery pack typically consists of multiple cells and a Battery Management System (BMS). The BMS is responsible for monitoring cell status, estimating state of charge, managing cell balancing, and providing protection functions.

In recent days, high-voltage direct-grid-connected “ultra-fast charging” technologies have been deployed one after another. With a revolutionary design that allows direct connection to 10 kV / 35 kV medium-voltage grids and eliminates the need for traditional bulky transformers, this approach is rapidly becoming a mainstream pathway to achieve ultra-fast charging. By directly delivering DC output voltages of up to 800 V or even 1,000 V, it compresses electric vehicle charging time to the “minute level.”

In the laboratory, you may often hear a sentence: “Three-phase imbalance is just an abnormal condition—no need to worry too much.” But in reality, the situations that actually cause equipment problems are precisely these “non-ideal conditions.” Today, we will use the IT7900 three-phase AC power supply / grid simulator to talk about a very “engineering” topic: how to simulate three-phase voltage imbalance.