Selective Harmonic Elimination
Selective Harmonic Elimination - Related Videos
09:23
Harmonic Nanoparticles for Regenerative Research
0 Views •
Cited by 1 •
2014
Protocol details are provided for in vitro labeling human embryonic stem cells with second harmonic generating nanoparticles. Methodologies for hESC investigation by multi-photon microscopy and their differentiation into cardiac clusters are also presented.
05:18
Selective Cell Elimination from Mixed 3D Culture Using a Near Infrared Photoimmunotherapy Technique
0 Views •
Cited by 21 •
2016
Eliminating specific cells without damaging other cells is extremely difficult, especially in established tissue, yet there is an urgent need for a cell elimination method in the tissue engineering field. Here, we present a method for specific cell elimination from a mixed 3D cell culture using near infrared photoimmunotherapy (NIR-PIT).
01:09
Harmonic Mean
0 Views •
2023
The arithmetic mean is usually skewed towards the larger values in the data set. Therefore, to avoid this inherent bias towards smaller values, the harmonic mean is used. Take the example of the speed of a car, which is the measure of the rate of distance traveled. If the vehicle traverses the same distance back-and-forth, its average speed equals the total distance traveled divided by the total time taken. However, if the car moves with varying speeds, then the arithmetic mean is more skewed...
07:52
Hooke's Law and Simple Harmonic Motion
0 Views •
2023
Source: Ketron Mitchell-Wynne, PhD, Asantha Cooray, PhD, Department of Physics & Astronomy, School of Physical Sciences, University of California, Irvine, CA Potential energy is an important concept in physics. Potential energy is the energy associated with forces that depend upon the position of an object relative to its surroundings. Gravitational potential energy, which is discussed in another video, is the energy associated that is directly proportional to the height of an object above...
09:19
Simultaneous Label-Free Autofluorescence Multi-Harmonic Microscopy
0 Views •
Cited by 3 •
2025
This protocol presents a step-by-step guide for the Simultaneous Label-free Autofluorescence Multi-harmonic (SLAM) microscopic technique, including details on how to generate the laser light source, prepare a tissue sample, conduct imaging, and analyze the data. SLAM advances nonlinear microscopy by measuring four complementary label-free contrasts to investigate the tissue microenvironment.
FAQs
Switching angles determine which voltage contributions appear at particular frequency terms during each inverter cycle. Selective Harmonic Elimination uses precisely calculated angles, then solves harmonic equations to make targeted terms cancel while maintaining the required fundamental component. Their values therefore determine the tradeoff between harmonic suppression and fundamental-voltage control, making angle accuracy central to waveform quality.
The fundamental component sets the main output waveform that the power-conversion system is intended to deliver, whereas selected harmonic terms represent unwanted distortion. By including the fundamental-voltage requirement alongside cancellation equations, the method can reduce specified harmonic content without treating voltage magnitude as an afterthought. This combined control is valuable when waveform quality and usable output voltage must be managed together.
Selective Harmonic Elimination addresses unwanted frequency components through the inverter’s switching pattern rather than relying solely on bulky passive filters after conversion. Reducing targeted harmonics at the waveform-generation stage can lower filter requirements, electromagnetic interference, and power losses. The approach therefore combines mathematical switching control with power-circuit operation to improve power quality more efficiently than filter dependence alone.
A basic workflow begins by identifying the desired fundamental voltage and the harmonic components that should be suppressed. Engineers then calculate switching angles within each cycle and solve the corresponding harmonic equations. The resulting angles are applied to the inverter’s switching operation, producing a waveform designed to retain the fundamental while cancelling the selected terms.
The technique is applied to multilevel and other power inverters used in motor drives, renewable-energy converters, and grid-connected equipment. In these settings, controlling selected harmonics can improve the quality of the delivered electrical waveform while reducing dependence on additional filtering. Its relevance extends across systems where efficient power conversion and controlled output voltage are important engineering objectives.
Multilevel inverters are among the power-conversion platforms that can use calculated switching angles to shape their output voltage. Selective Harmonic Elimination provides a mathematical control strategy for choosing those angles, allowing engineers to target specific distortion components while preserving the desired fundamental voltage. This supports improved power quality and can help limit filter size, electromagnetic interference, and conversion losses.