Analysis and mitigation of common mode voltages in photovoltaic power systems

Somasundaram Essakiappan, Prasad Enjeti, Robert S. Balog, Shehab Ahmed

Research output: Chapter in Book/Report/Conference proceedingConference contribution

30 Scopus citations


A typical photovoltaic (PV) power system is composed of multiple strings of PV arrays with one central inverter or a combination of PV modules with micro-inverters. Per-module DC-DC converter and series connected multilevel inverter topologies are possible candidates. In this paper, the analyses of common mode voltages and currents in the afore-mentioned PV topologies are detailed. The grid integration of PV power employs a combination of pulse width modulation (PWM) DC-DC converters and inverters. Due to their fast switching nature a common mode voltage is generated with respect to the ground, inducing a circulating current through the ground capacitance. Common mode voltages lead to increased voltage stress, electromagnetic interference and malfunctioning of ground fault protection systems. This paper analyzes the common mode voltages and current present in high and low power PV systems with different topologies. Mitigation strategies such as common mode filter and transformer shielding are proposed to minimize common mode voltages and currents. A practical rooftop PV system rated at 2.76 kW per string is used in the analysis. © 2011 IEEE.
Original languageEnglish (US)
Title of host publicationIEEE Energy Conversion Congress and Exposition: Energy Conversion Innovation for a Clean Energy Future, ECCE 2011, Proceedings
PublisherIEEE Computer [email protected]
ISBN (Print)9781457705427
StatePublished - Jan 1 2011
Externally publishedYes

Bibliographical note

Generated from Scopus record by KAUST IRTS on 2019-11-27


Dive into the research topics of 'Analysis and mitigation of common mode voltages in photovoltaic power systems'. Together they form a unique fingerprint.

Cite this