NDLI: Capacitor impedance estimation utilizing dc-link voltage oscillations in single phase inverter

Content Provider	IET Digital Library
Author	Arya, Abhinav Ahmad, Md. Waseem Agarwal, Nikunj Anand, Sandeep
Abstract	Grid tied single-phase solar inverters offer less operational life when compared with the Photovoltaic (PV) panels due to the use of aluminium electrolytic capacitor (AEC). With time, AEC degrades, resulting in an increase in ripple voltage on PV panel. This would reduce the power extraction efficiency of the system, thereby a loss of revenue. This study proposes a simple and cost-efficient online technique for monitoring the health of AECs. The proposed technique suggests evaluating the AEC impedance at twice the grid frequency. Sampling of PV voltage, PV current and inductor current is required to determine the second harmonic impedance of AEC. These voltage and current sensors are present in commercially available solar PV inverters for their control operation. The proposed technique could be extended to other single-phase inverter applications provided that voltage and current sensors are available. Suitable mathematical model of the technique is derived to determine the effect of sampling instant on the accuracy of the results. Criteria for the replacement of capacitor based on impedance monitoring is defined. For validation of the proposed technique, detailed simulation studies are carried out for a single-phase PV system. The technique is verified experimentally on a scaled down solar PV inverter prototype.
Starting Page	1046
Ending Page	1053
Page Count	8
ISSN	17554535
Volume Number	10
e-ISSN	17554543
Issue Number	Issue 9, Jul (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/10/9
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2016.0603
Journal	IET Power Electronics
Publisher Date	2017-03-29
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	AEC Aluminium Electrolytic Capacitor Condition Monitoring Cost-efficient Online Technique Current Measurement Current Sensor Digital Signal Processor Electric Current Measurement Electric Impedance Measurement Electric Sensing Device Electrolytic Capacitor Grid Frequency Health Determination Health Monitoring Impedance And Admittance Measurement Inductor Current Invertors Low-frequency Impedance Monitoring Mathematical Model Maximum Power Point Trackers Maximum Power Point Tracking Algorithm Other Power Apparatus And Electric Machine Photovoltaic Power System Photovoltaic Source Power Capacitor Power Extraction Efficiency Reduction Power Grid PV Current PV Panel PV Source PV Voltage Sampling Ripple Voltage Second Harmonic Impedance Sensing Device And Transducers Single-phase Grid Single-phase PV System Single-stage Grid Feeding Inverter Solar Power Stations Solar PV Inverter Voltage Measurement Voltage Sonsor
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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