A grid-connected photovoltaic power system, or grid-connected PV power system is an electricity generating solar PV system that is connected to the utility grid. Its impact on power quality of the system is major concern for both utility... more
A grid-connected photovoltaic power system, or grid-connected PV power system is an electricity generating solar PV system that is connected to the utility grid. Its impact on power quality of the system is major concern for both utility company and users but that quality may be affected by harmonics. Therefore Reducing harmonic content in the grid connected power system is very important. In this paper , effect of single tuned harmonic filter on grid connected PV system is analyzed. Its impact on harmonics and power factor is considered. For simulation study PV connected system of Dr. C.V. Raman university, Kota is considered .For simulation study ETAP software is used. The system parameters are taken from actual site condition.
A 24-dimensional model for the ‘harmonic content’ of pieces of music has proved to be remarkably robust in the retrieval of polyphonic queries from a database of polyphonic music in the presence of quite significant noise and errors in... more
A 24-dimensional model for the ‘harmonic content’ of pieces of music has proved to be remarkably robust in the retrieval of polyphonic queries from a database of polyphonic music in the presence of quite significant noise and errors in either query or database document. We have further found that higher-order (1st- to 3rd-order) models tend to work better for music retrieval than 0th-order ones owing to the richer context they capture. However, there is a serious performance cost due to the large size of such models and the present paper reports on some attempts to reduce dimensionality while retaining the general robustness of the method. We find that some simple reduced-dimensionality models, if their parameter settings are carefully chosen, do indeed perform almost as well as the full 24-dimensional versions. Furthermore, in terms of recall in the top 1000 documents retrieved, we find that a 6-dimensional 2nd-order model gives even better performance than the full model. This represents a potential 64-times reduction in model size and search-time, making it a suitable candidate for filtering a large database as the first stage of a two-stage retrieval system.
This paper presents a general proposal to design and calculate the performance of a tubular permanent magnet linear generator using the Finite Element Method, The cogging force, which occurs due to the interaction between stator teeth and... more
The Cosmological Circle from ancient geometry, with its right triangles, and the ratios of the Pythagorean Table are found to be harmonically related to the fundamental physical constants. After a brief history of harmonic mathematics,... more
The Cosmological Circle from ancient geometry, with its right triangles, and the ratios of the Pythagorean Table are found to be harmonically related to the fundamental physical constants. After a brief history of harmonic mathematics, harmonic values are calculated for the speed of light constant, gravitational constant, Planck's constant, and the inverse fine-structure constant. We then calculate the harmonic of electron mass and proton mass, showing the related Pythagorean/Cosmological Circle harmonics; and speculate on geometry and symmetry. ssrn.com/abstract=1032181
ABSTRACT Harmonics have become an important concern in today's power system network. Conventional Inductive Voltage Transformers (IVT) are used as the essential instrument for harmonic measurement. However, the frequency... more
ABSTRACT Harmonics have become an important concern in today's power system network. Conventional Inductive Voltage Transformers (IVT) are used as the essential instrument for harmonic measurement. However, the frequency bandwidths of the IVTs are limited. As a result, they are not suitable for high order harmonic measurement. This paper thus presents the testing and modelling of the frequency response of a 33kV single phase IVT up to 5 kHz. The test system setup for testing the IVT frequency response is described. The frequency response of a 33kV single phase IVT is measured and analyzed. A model of the 33kV IVT is developed and validated by comparing the simulation with the experimental results. Good correlation between the two results is observed. The impact of burden on the frequency response of the 33kV IVT is also simulated and discussed.
Normally, the half-harmonic oscillator is active when x > 0 and absent when x < 0. From a canonical quantization perspective, this leads to odd eigenfunctions being present while even eigenfunctions are absent. In that case, only... more
Normally, the half-harmonic oscillator is active when x > 0 and absent when x < 0. From a canonical quantization perspective, this leads to odd eigenfunctions being present while even eigenfunctions are absent. In that case, only the usual odd eigenfunctions will appear if the wall slides to negative infinity. However, if an affine quantization is used, sliding the wall away shows that all the odd and even eigenfunctions are encountered, exactly like any full-harmonic oscillator.
In this work, we investigate spectral envelope estimation for harmonic signals. We address the issue of model order selection and propose to make use of the fact that the spectral envelope is sampled by means of the harmonic structure of... more
In this work, we investigate spectral envelope estimation for harmonic signals. We address the issue of model order selection and propose to make use of the fact that the spectral envelope is sampled by means of the harmonic structure of the signal in order to derive upper bounds for the estimator order. An experimental study is performed using synthetic test signals with various fundamental frequencies and different model structures to evaluate the performance of the envelope models. Experimental results confirm the relation between optimal model order and fundamental frequency.
