The Active Voltage Conditioner (AVC) is a series-connected power electronic system designed to compensate voltage sags, swells, unbalance, and flicker disturbances in industrial power networks. Unlike conventional voltage regulators, the AVC is installed between the grid and the load, injecting a compensation voltage in real time to maintain a stable and distortion-free load voltage.
AVC systems are widely used in facilities where voltage quality directly affects production continuity—such as automotive manufacturing, robotics, process automation, semiconductor production, and IT infrastructures. By stabilizing the load voltage, AVC significantly reduces downtime, equipment failures, and production losses.
Inrush AVC units utilize a multilevel series voltage-source inverter topology and a high-speed DSP/FPGA control platform, providing millisecond-level response and precise voltage correction for both low-voltage and medium- voltage applications.
The AVC functions as a series voltage injector, applying the required compensation voltage between the grid and the load through a series transformer. By continuously measuring both grid and load voltages, the AVC computes the voltage error vector and injects the compensating voltage to maintain the reference load voltage under all operating conditions.
Inrush AVC systems use a multilevel Voltage Source Inverter (VSI), providing:
Advanced DSP-based algorithms regulate the compensation voltage using both instantaneous voltage control and RMS-based systems. This allows the AVC to correct a wide range of disturbances including:
When integrated with an energy storage system (ESS), the AVC can additionally provide ride-through support during short-duration power interruptions, maintaining stable load voltage even when the grid supply is lost momentarily.
Inrush AVC systems are designed in accordance with global power quality, EMC, and electrical safety standards. Key reference standards include:
For medium-voltage installations, AVC units are supplied together with compliant series-injection transformers meeting IEC 60076-11 requirements for dielectric strength, thermal performance, and short-circuit withstand.
The AVC is ideal for applications where voltage disturbances cause process interruptions, product defects, equipment malfunction, or control system failures. Typical applications include:
By mitigating voltage disturbances, the AVC significantly reduces downtime, prevents production losses, and enhances the operational efficiency and reliability of industrial facilities.