Farm-level Interactions Study of a Novel Tri-port Soft-switching Medium-Voltage String Inverter (MVSI) based Large-scale PV-Plus-Storage Farms

Chowdhury, Vikram Roy; An, Zheng; Kandula, Rajendra Prasad; Divan, Deepak

doi:10.1109/apec43599.2022.9773544

Farm-level Interactions Study of a Novel Tri-port Soft-switching Medium-Voltage String Inverter (MVSI) based Large-scale PV-Plus-Storage Farms

Conference · 20 March 2022 · Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition (APEC) (Online)

DOI:https://doi.org/10.1109/apec43599.2022.9773544· OSTI ID:1923364

Chowdhury, Vikram Roy ^[1]; An, Zheng ^[1]; Kandula, Rajendra Prasad ^[1]; Divan, Deepak ^[1]

Georgia Inst. of Technology, Atlanta, GA (United States)

A medium-voltage photovoltaic power conversion unit supported by battery based on a novel topology of soft switching solid state transformer is presented in this paper. It can reduce the Levelized Cost of Energy (LCOE) of PVS farm in an extended degree. However, its capability to provide grid-support services, such as frequency response, reactive power support, etc, have not been demonstrated. A series/parallel combination of these modules form a large 20 MVA solar farm. To validate them with reduced computation burden, a small-signal model of MVSI is firstly derived and validated in this paper. The model has been validated to match the full-switch model in both steady-state and dynamic conditions. Next, a farm-level simulation based on the proved small-signal model was implemented to demonstrate grid-support services. Real irradiation date from NREL is used to show the operational capabilities of the system. As a result, the overall farm is simulated based on MATLAB/Simulink domain to check the performance for various cases namely: power transfer from dc-ac side, reactive power support during grid voltage sag and utilization of battery during grid voltage disturbance or partial shading over PV panels.

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Research Organization:: Georgia Institute of Technology, Atlanta, GA (United States)

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

DOE Contract Number:: EE0008351

OSTI ID:: 1923364

Journal Information:: Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition (APEC) (Online), Vol. 2022; Conference: 2022 IEEE Applied Power Electronics Conference and Exposition (APEC), Houston, TX (United States), 20-24 Mar 2022; ISSN 2470-6647

Publisher:: IEEE

Country of Publication:: United States

Language:: English

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