Measurement results and performance analysis of the grid impedance in different low voltage grids for a wide frequency band to support grid integration of renewables

Author(s):  
Lars Jessen ◽  
Sandro Gunter ◽  
Friedrich W. Fuchs ◽  
Martin Gottschalk ◽  
Hans-J. Hinrichs
2011 ◽  
Vol 128-129 ◽  
pp. 190-195
Author(s):  
Hua Lin Liu ◽  
Yin Bo Zhan ◽  
Xiao Lei ◽  
You Yuan Wang ◽  
Hua Rong Zeng ◽  
...  

As we know, the TF method is more sensitive to changes in the power transformers at higher frequencies. Although measurement based on low voltage impulse (LVI) is definitely faster than that based on swept frequency method (SFM), the available frequency band is narrow because of the typical microsecond impulse. In this paper, the characteristics of the nanosecond impulse in the frequency domain were investigated. A test System based on Nanosecond low voltage impulse was developed. The proposed method was applied to a 10kV/100kVA distribution transformer in the laboratory. Measurement results with two different impulses were compared.


DYNA ◽  
2020 ◽  
Vol 87 (215) ◽  
pp. 163-173
Author(s):  
Alejandra Martínez Peñaloza ◽  
Luisa Carrillo-Sandoval ◽  
Gabriel Malagón-Carvajal ◽  
César Duarte-Gualdrón ◽  
German Alfonso Osma Pinto

The high utilization of nonlinear devices in buildings increases harmonic distortion in the electrical voltage and current signals, which has led to the requirement of characterizing and predicting the impact of such devices on low-voltage networks using load models. One of the charges that still performs an important role in the energy consumption of commercial, industrial, and educational buildings is the recessed fluorescent light with electronic ballast, which is commonly used in Colombia. However, information regarding the modeling of their behavior in the case of distorted power supply voltages is scarce. Therefore, this work presents the parameter configuration and performance analysis of two load models in the time domain, i.e., ZIP and exponential, and one model in the frequency domain, i.e., Norton equivalent model to the coupled admittance matrix method, for two commonly used recessed fluorescent lights.


Author(s):  
Monthippa Uthansakul ◽  
Marek E. Bialkowski

This chapter introduces the alternative approach for wideband smart antenna in which the use of tapped-delay lines and frequency filters are avoidable, so called wideband spatial beamformer. Here, the principles of operation and performance of this type of beamformer is theoretically and experimentally examined. In addition, its future trends in education and commercial view points are identified at the end of this chapter. The authors hope that the purposed approach will not only benefit the smart antenna designers, but also inspire the researchers pursuing the uncomplicated beamformer operating in wide frequency band.


2021 ◽  
Vol 112 ◽  
pp. 55-68
Author(s):  
Praveen Vummadisetty Naidu ◽  
Akkapanthula Saiharanadh ◽  
Dhanekula Maheshbabu ◽  
Arvind Kumar ◽  
Neelima Vummadisetty

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