Subcycle Overvoltage Dynamics in Solar PVs

Fan, Lingling; Miao, Zhixin; Zhang, Miao

doi:10.1109/tpwrd.2020.3016279

Subcycle Overvoltage Dynamics in Solar PVs

Journal Article · Thu Aug 13 00:00:00 EDT 2020 · IEEE Transactions on Power Delivery

DOI:https://doi.org/10.1109/tpwrd.2020.3016279· OSTI ID:2202808

^[1]; ^[2]; Zhang, Miao ^[2]

University of South Florida, Tampa, FL (United States); University of South Florida
University of South Florida, Tampa, FL (United States)

In 2017 and 2018, bulk power system (BPS) connected solar photovoltaic (PV) inverters tripped after grid disturbances in South California, causing large-scale power loss. One cause of PV tripping is subcycle overvoltage experienced by PV inverters when the grid suffers voltage dip and PVs enter into momentary cessation. This paper examines the underlying mechanism of the subcycle overvoltage dynamics. A dq-frame analytical model is built for a PV grid-integration system with a focus on the grid side converter (GSC) and grid interaction. PV's dc circuit dynamics and controls are ignored. Eigenvalue analysis indicates that two modes cause the subcycle overvoltage. The modes are associated with shunt compensation, grid electromagnetic dynamics, and PV inverter controls. Furthermore, a more insightful explanation of subcycle overvoltage is offered relying on s-domain admittance models. The dq-frame admittance is derived for the PV viewed from the point of common coupling (PCC). A circuit model relying on the derived admittance can demonstrate subcycle overvoltage due to momentary cessation. Impacts of grid strength, phase-locked-loop (PLL) parameters and converter current control parameters are all examined. Here, it is found that the inherent LC dynamics due to shunt compensation and grid inductance are the main dynamics that can cause overvoltage, and momentary cessation excites overvoltage dynamics.

Research Organization:: University of South Florida, Tampa, FL (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office

Grant/Contract Number:: EE0008771

OSTI ID:: 2202808

Alternate ID(s):: OSTI ID: 1848880

Journal Information:: IEEE Transactions on Power Delivery, Journal Name: IEEE Transactions on Power Delivery Journal Issue: 3 Vol. 36; ISSN 0885-8977

Publisher:: IEEECopyright Statement

Country of Publication:: United States

Language:: English

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