DC component detection in grid connected inverter systems, using a mid-ground low pass filter approach

2016 ◽  
Author(s):  
W. Zhang ◽  
M. Elgendy ◽  
M. Armstrong
Keyword(s):  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass ◽  
Dc Component ◽  
Filter Approach ◽  
Grid Connected Inverter

scholarly journals Airborne gravimetry: An investigation of filtering

Geophysics ◽  
1999 ◽  
Vol 64 (1) ◽  
pp. 61-69 ◽  
Author(s):  
Vicki A. Childers ◽  
Robin E. Bell ◽  
John M. Brozena
Keyword(s):  
Gravity Data ◽  
Substantial Improvement ◽  
Airborne Gravity ◽  
Airborne Gravimetry ◽  
Pass Filter ◽  
Low Pass Filter ◽  
West Antarctic ◽  
Low Pass ◽  
Filter Approach ◽  
Gravity Signal

Low‐pass filtering in airborne gravimetry data processing plays a fundamental role in determining the spectral content and amplitude of the free‐air anomaly. Traditional filters used in airborne gravimetry, the 6 × 20-s resistor‐capacitor (RC) filter and the 300-s Gaussian filter, heavily attenuate the waveband of the gravity signal. As we strive to reduce the overall error budget to the sub-mGal level, an important step is to evaluate the choice and design of the low‐pass filter employed in airborne gravimetry to optimize gravity anomaly recovery and noise attenuation. This study evaluates low‐pass filtering options and presents a survey‐specific frequency domain filter that employs the fast Fourier transform (FFT) for airborne gravity data. This study recommends a new approach to low‐pass filtering airborne data. For a given survey, the filter is designed to maximize the target gravity signal based upon survey parameters and the character of measurement noise. This survey‐specific low‐pass filter approach is applied to two aerogravimetry surveys: one conducted in West Antarctica and the other in the eastern Pacific off the California coast. A reflight comparison with the West Antarctic survey shows that anomaly amplitudes are increased while slightly improving the rms fit between the reflown survey lines when an appropriately designed FFT filter is employed instead of the traditionally used filters. A comparison of the East Pacific survey with high‐resolution shipboard gravity data indicates anomaly amplitude improvements of up to 20 mGal and a 49% improvement of the rms fit from 3.99 mGal to 2.04 mGal with the appropriately designed FFT filter. These results demonstrate that substantial improvement in anomaly amplitude and wavelength can be attained by tailoring the filter to the survey.

Performance improvement of shunt active power filter by a new wavelet-based low-pass filter: Theory and implementation

2016 ◽  
Vol 40 (1) ◽  
pp. 111-121 ◽  
Author(s):  
Javad Modarresi ◽  
Mehdi Fallah ◽  
Eskandar Gholipour ◽  
Mostafa Abarzadeh
Keyword(s):  
Active Power Filter ◽  
Active Power ◽  
Component Separation ◽  
Shunt Active Power Filter ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Power Filter ◽  
Low Pass ◽  
Dc Component ◽  
Time Accuracy

In this paper, a wavelet-based low-pass filter (WBLPF) is proposed to improve the direct current (DC) component separation speed. To this end, three different methods are studied to implement discrete wavelet transform, and then they are compared with each other in term of transient response time, accuracy and computational cost. Afterwards, the conventional low-pass filter is replaced by the new WBLPF in the p-q method. This replacement increases the speed of DC component separation, and consequently the performance of the shunt active power filter is improved. To verify and examine the proposed method, a power system is simulated in MATLAB software and a prototype is implemented in the laboratory. The simulation and experimental results confirm the superiority of the proposed method.

The Design of a New Signal Handing Circuit of Seismic Geophone

2014 ◽  
Vol 960-961 ◽  
pp. 670-675
Author(s):  
Liang Li ◽  
Xian Guo Tuo ◽  
Xiao Bo Mao ◽  
Ming Zhe Liu
Keyword(s):  
System Design ◽  
Seismic Signal ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass ◽  
New Type ◽  
Dc Component

This paper aims at the problem that how to elimination the DC component of the MEMS geophone in the acquisition and processing of Seismic signal. Put forward to design a new circuit in the signal handing system. Design a new type of DC elimination circuit to eliminate the DC component through low-pass filter, reverse and other modules. The experiment result shows that, this new DC elimination circuit is easier to realize and has a large advantage than other existing DC elimination circuits.

Performance Improvement of Digital Phase Locked Loop Algorithm Using all Pass Filter and Low Pass Filter for Grid Connected Inverter Reference

2013 ◽  
Vol 313-314 ◽  
pp. 1274-1278
Author(s):  
F. Yusivar ◽  
Y. Syaifuddin ◽  
A.N. Rahman
Keyword(s):  
Performance Improvement ◽  
Phase Locked Loop ◽  
High Accuracy ◽  
Reference Frequency ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Digital Phase ◽  
Low Pass ◽  
Grid Connected Inverter ◽  
Conventional Algorithm

Digital Phase Locked Loop (PLL) is an algorithm that is used to detect the phase, frequency, and amplitude of a signal. The output of digital PLL algorithm can be used as synchronization reference for grid connected inverter. A digital PLL algorithm is very popular to be used since its structure is very simple and it has high accuracy. However, the output of digital PLL is not stable if the input reference frequency is shifted from the pre-defined fundamental frequency and that condition will result an oscillation in digital PLL output. In this paper, an algorithm modification is employed using low pass filter and all pass filter to improve the digital PLL output response under various condition. All simulation results will be shown and compared to the conventional algorithm.

Design of Programmable Wideband Low Pass Filter with Continuous-Time/Discrete-Time Hybrid Architecture

2017 ◽  
Vol E100.C (10) ◽  
pp. 858-865 ◽  
Author(s):  
Yohei MORISHITA ◽  
Koichi MIZUNO ◽  
Junji SATO ◽  
Koji TAKINAMI ◽  
Kazuaki TAKAHASHI
Keyword(s):  
Discrete Time ◽  
Continuous Time ◽  
Hybrid Architecture ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass

ANALYSIS AND IMPROVEMENT TECHNIQUES FOR THE TRANSFER FUNCTION OF A PLANAR LOW - PASS FILTER

2016 ◽  
Vol 15 (12) ◽  
pp. 2579-2586
Author(s):  
Adina Racasan ◽  
Calin Munteanu ◽  
Vasile Topa ◽  
Claudia Pacurar ◽  
Claudia Hebedean
Keyword(s):  
Transfer Function ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass

scholarly journals Simulating Elliptic Low-pass Filter based on MOCCCII

2020 ◽  
Vol 965 ◽  
pp. 012037
Author(s):  
Nanan Chomnak ◽  
Siradanai Srisamranrungrueang ◽  
Natapong Wongprommoon
Keyword(s):  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass
Sign in / Sign up

Export Citation Format

Share Document