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...
Stabilizing Renewable Energy Projects with SVG and AHF – An Engineer’s Perspective In the rapidly growing renewable energy sector, ensuring grid stability is one of the biggest challenges. Solar and wind power, while sustainable, are inherently variable. Voltage fluctuations and harmonic distortions are common issues that can compromise both safety and efficiency of power transmission....
While the terms are sometimes used interchangeably, there's a key conceptual difference between Real-Time Power Factor Correction and Active Power Factor Correction. 1. Real-Time Power Factor Correction (PFC) This is a functional description. It describes any power factor correction system that can dynamically adjust its compensation in response to changes in the load. Goal:&nb...
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 ...
When we talk about modern power systems, two technical domains often overlap but are not always fully understood together: electromagnetic compatibility (EMC) and power quality. Both play crucial roles in ensuring that electrical and electronic equipment perform reliably and efficiently. For companies and industries adopting Static Var Generators (SVGs) and Active Harmonic Filters (AHFs)...
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...
Introduction As global energy demand continues to rise, distributed photovoltaic (PV) generation has emerged as a key solution for achieving sustainable and decentralized power. In Latin America, Colombia has been steadily expanding its renewable energy capacity, with the city of Medellín—a vibrant urban hub surrounded by the Andes Mountains—leading the way in solar adoption. Th...
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...
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