An Impedance Measurement Method of Solar Panels by Power Converter using PRBS

2020 ◽  
Vol 140 (3) ◽  
pp. 140-147
Author(s):  
Koji Takechi ◽  
Takeshi Yokoi ◽  
Hiroaki Kakigano
Keyword(s):  
Measurement Method ◽  
Impedance Measurement ◽  
Power Converter ◽  
Solar Panels

scholarly journals Accurate Online Battery Impedance Measurement Method with Low Output Voltage Ripples on Power Converters

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1064
Author(s):  
Qi Yao ◽  
Dylan-Dah-Chuan Lu ◽  
Gang Lei
Keyword(s):  
Duty Cycle ◽  
Measurement Method ◽  
Power Converters ◽  
Impedance Measurement ◽  
High Amplitude ◽  
Power Converter ◽  
Wide Frequency Range ◽  
Perturbation Source ◽  
Battery State Of Charge ◽  
Input Side

The conventional online battery impedance measurement method works by perturbing the duty cycle of the DC-DC power converter and measuring the response of the battery voltage and current. This periodical duty cycle perturbation will continuously generate large voltage ripples at the output of power converters. These large ripples will not easily be removed due to the high amplitude and wide frequency range and would be a challenge to meet tight output regulation. To solve this problem, this paper presents a new online battery impedance measurement technique by inserting a small switched resistor circuit (SRC) into the converter. The first contribution of this work is that the perturbation source is moved from the main switch to the input-side of the converter, so the ripples are reduced. The analysis and experimental results of the proposed method show a reduction of 16-times compared with the conventional method. The second contribution tackles the possible change of the battery state of charge (SOC) during the online battery measurement process, which will inevitably influence the impedance measurement accuracy. In this proposed method, battery impedance at multiple frequencies can be measured simultaneously using only one perturbation to accelerate measurement speed and minimize possible SOC change. The experimental impedance results coincide with a high-accuracy laboratory battery impedance analyzer.

scholarly journals Experimental Validation of Harmonic Impedance Measurement and LTP Nyquist Criterion for Stability Analysis in Power Converter Networks

2019 ◽  
Vol 34 (8) ◽  
pp. 7972-7982 ◽  
Author(s):  
Valerio Salis ◽  
Alessandro Costabeber ◽  
Stephen M. Cox ◽  
Francesco Tardelli ◽  
Pericle Zanchetta
Keyword(s):  
Stability Analysis ◽  
Experimental Validation ◽  
Impedance Measurement ◽  
Power Converter ◽  
Nyquist Criterion

Point-of-care detection of Tannerella forsythia using an antigen–antibody assisted dielectrophoretic impedance measurement method

2015 ◽  
Vol 82 ◽  
pp. 37-42 ◽  
Author(s):  
Yoshihito Ishii ◽  
Kentaro Imamura ◽  
Yuichiro Kikuchi ◽  
Satoshi Miyagawa ◽  
Ryo Hamada ◽  
...  
Keyword(s):  
Measurement Method ◽  
Point Of Care ◽  
Impedance Measurement ◽  
Tannerella Forsythia ◽  
Antigen Antibody ◽  
Point Of Care Detection
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