Voltage Harmonic Filtering (VHF) is an active power electronics solution designed to reduce harmonic currents and voltages generated by nonlinear loads, maintain Total Harmonic Distortion (THD) within international standards, and increase the lifetime of electrical equipment.
Modern industrial facilities use a wide range of rectifier-based loads (SMPS, variable speed drives, robotics, CNC machinery, inverter-based processes). These loads generate significant harmonic currents that can cause:
The Inrush VHF unit uses real-time harmonic analysis and active compensation algorithms to filter disturbances across the 2nd–50th harmonic band. Its high-bandwidth control structure provides fast response and restores near-perfect sinusoidal current flow toward the grid.
Unlike traditional passive filters, the VHF system is based on a dynamic, adaptive, and self-tuning power electronics architecture.
The VHF uses an inverter-based active power module to inject harmonic currents that are equal in magnitude and opposite in phase to those generated by the load. This active cancellation significantly reduces harmonic current flow to the grid.
The Inrush VHF incorporates the following control features:
Inrush VHF systems are designed and validated according to major international power quality, EMC, and electrical safety standards.
All Inrush products undergo type, routine, FAT/SAT, thermal performance, and short-circuit withstand testing. CE and applicable regional standards are fully supported.
VHF systems play a crucial role in facilities with high harmonic distortion levels or sensitive power quality requirements. Key application areas include:
By improving power quality and reducing harmonic-induced stress on electrical infrastructure, the VHF enhances equipment lifetime and significantly increases operational reliability.