A ship, particularly a modern, advanced vessel, is essentially a floating, highly concentrated town of power systems. The stability, efficiency, and reliability of its electrical system are directly related to the ship's operational safety, operating costs, and mission. The SVG, as a dynamic, precise, and high-performance reactive power compensation device, plays an irreplaceable role in...
I. Why Are Non-Linear Loads So Ubiquitous in Our Daily Lives? The fundamental reason is technological advancement and our relentless pursuit of efficiency and control. The core of non-linear loads is various power electronic devices that precisely control electrical energy through rapid switching. Here are the specific reasons for their ubiquity: Demand for Energy Savings and Efficiency:...
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...
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 ...
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