Isochronous Architecture-Based Voltage-Active Power Droop for Multi-Inverter Systems

Patel, Sourav; Chakraborty, Soham; Lundstrom, Blake; Salapaka, Srinivasa; Salapaka, Murti V.

doi:10.1109/tsg.2020.3037159

Isochronous Architecture-Based Voltage-Active Power Droop for Multi-Inverter Systems

Journal Article · Mon Nov 16 00:00:00 EST 2020 · IEEE Transactions on Smart Grid

DOI:https://doi.org/10.1109/tsg.2020.3037159· OSTI ID:1764892

Patel, Sourav ^[1]; Chakraborty, Soham ^[1]; Lundstrom, Blake ^[2]; Salapaka, Srinivasa ^[3]; Salapaka, Murti V. ^[1]

Univ. of Minnesota, Minneapolis, MN (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Univ. of Illinois at Urbana-Champaign, IL (United States)

This article proposes an isochronous architecture for parallel inverters with only voltage-active power droop (VP-D) control for improving active power sharing as well as plug-and-play of multi-inverter-based distributed energy resources (DERs). The isochronous framework obviates the need for an explicit regulation of the frequency while allowing for sharing of reactive power. The article shows that the detrimental effects of circulating currents between inverters can be addressed in the framework developed. The isochronous architecture is implemented by employing a GPS to disseminate clock timing signals that enable the microgrid to maintain the nominal system frequency. Small signal eigenvalue analysis of a Multi-inverter Microgrid system near the steady-state operating point is presented to evaluate the system stability. Moreover, unlike traditional droop-based methods, the isochronous strategy lends itself to analytical guarantees which are developed in the article. Furthermore, the effect of delays in receiving GPS clock signals by an inverter is experimentally characterized and an inverter isolation mechanism is proposed that disconnects inverters facing large GPS communication delays. Hardware experiments on an 1.2 kVA-prototype and controller-hardware-in-the-loop validation on the CIGRE distribution network are conducted to demonstrate the effectiveness of the proposed architecture towards active and reactive power sharing between inverters with load scenarios.

View Accepted Manuscript (DOE)

Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: AC36-08GO28308; AR0000701

OSTI ID:: 1764892

Report Number(s):: NREL/JA-5D00-73654; MainId:6460; UUID:7a7a41a3-335a-e911-9c21-ac162d87dfe5; MainAdminID:18780

Journal Information:: IEEE Transactions on Smart Grid, Journal Name: IEEE Transactions on Smart Grid Journal Issue: 2 Vol. 12; ISSN 1949-3053

Publisher:: IEEECopyright Statement

Country of Publication:: United States

Language:: English

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