The Short Summary A healthy AHF typically produces two types of noise: A low hum from the internal reactor (inductor) and cooling fans. This is normal. A high-frequency "switching" whine or buzz from the Insulated-Gate Bipolar Transistors (IGBTs). This is usually very faint. If the noise becomes loud, intrusive, or changes significantly, it is often a sign of a problem. Detailed Breakdow...
EMC (Electromagnetic Compatibility) testing for an Active Harmonic Filter AHF is critical and non-negotiable. An AHF(APF) is a power electronics device (like a high-frequency inverter) that injects canceling currents into a noisy electrical system. If poorly designed, it can become a significant source of electromagnetic interference (EMI) itself, disrupting other equipment. Conversely, it mu...
The Problem: Variable Speed Drives Generate Harmonics What is a Variable Speed Drive (VSD/VFD)?A Variable Speed Drive (VSD), also commonly called a Variable Frequency Drive (VFD) or Adjustable Speed Drive (ASD), is an electronic device that controls the speed and torque of an AC electric motor by varying the motor's input frequency and voltage. How Do They Cause Harmonics?The internal design of a ...
Modern industrial operations rely heavily on a steady, clean supply of electricity. The integrity of this power supply is constantly challenged by the proliferation of non-linear loads like variable frequency drives (VFDs), LED lighting systems, and server power supplies, all of which introduce complex harmonic distortions into the grid. These distortions can lead to devastating consequences, incl...
1. Why Do SVGs Generate Harmonics? Unlike ideal components, the real-world power electronic switches (IGBTs) in an SVG do not switch sinusoidally. They use Pulse Width Modulation (PWM) to synthesize a sinusoidal output current. This switching action is the primary source of harmonics. PWM Switching Frequency Harmonics: The output voltage of the SVG's H-Bridge inverters is a series of high-fre...
IN any system containing nonlinear loads that use phase-angle control or abrupt switching, particularly those that draw a non-sinusoidal current. The specific range of "2nd to 51st" is a classic signature of certain technologies.Here are the most common places where you would find such a wide harmonic spectrum: 1. The Classic Example: Thyristor-Controlled Reactor (TCR) in SVC Plants This is the mo...
Jiangsu Non Woven was founded in 2002 and has a 20-year history of non-woven fabric production, which is a high-quality manufacturer of high-end non-woven fabrics integrating R&D, production and after-sales. The factory is located in Zhitang Town, Changshu City, Jiangsu Province, a famous non-woven fabric production base in China, covering an area of 15,000 square meters, with a daily producti...
How a Copper Manufacturing Plant Solved Severe Harmonic Issues with SVG + APF Technology Real-world case study: Improving power quality, restoring capacitor operation, and eliminating production disruptions at Zhejiang Jinjia Special-Shaped Copper Co., Ltd. The Challenge: High Harmonics, Failed Capacitors, and Unstable Production Zhejiang Jinjia Special-Shaped Copper Co., Ltd., located in Changxin...
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