Modular Isolated Soft-Switching Medium Voltage String Inverter for Large-Scale PV Farm

An, Zheng; Han, Xiangyu; Zheng, Liran; Kandasamy, Karthik; Kandula, Rajendra Prasad; Divan, Deepak

doi:10.1109/apec39645.2020.9124584

Modular Isolated Soft-Switching Medium Voltage String Inverter for Large-Scale PV Farm

Conference · Thu Jun 25 00:00:00 EDT 2020 · Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition (APEC)

DOI:https://doi.org/10.1109/apec39645.2020.9124584· OSTI ID:1923372

An, Zheng ^[1]; Han, Xiangyu ^[2]; Zheng, Liran ^[2]; Kandasamy, Karthik ^[2]; Kandula, Rajendra Prasad ^[2]; Divan, Deepak ^[2]

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

This paper presents a single-stage modular isolated soft-switching medium voltage string inverter (MVSI) with tri-port configuration to interconnect PV and storage to medium voltage (MV) grid. The modular MVSI provides advanced functionalities such as energy storage elements integration without additional converters, connection to MV grid resulting in lower distribution losses in the PV farm, high-frequency galvanic isolation, independent control of PV, storage and grid power, high modularity and scalability. The topology of the MVSI, operation principle and model-predictive priority-switching (MPPS) control to achieve fast dynamic balancing across stacked modules are discussed. The independent power control is validated in PLECS simulation and the operation of stacked MVSI with MPPS control is verified through Hardware-in-the-loop (HIL) simulation. Here, the hardware prototype of 25 kVA MVSI building block is developed. 18 kW experimental results of single building block verifying tri-ports operation and 20 kW experimental results of two modules stacked operation are presented. A clean sinusoidal waveform with negligibly low THD in both tests is obtained. A low dv/dt of <; 1kV/us and soft-switching are achieved.

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Research Organization:: Georgia Inst. 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:: 1923372

Journal Information:: Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition (APEC), Journal Name: Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition (APEC) Vol. 2020; ISSN 1048-2334; ISSN 2470-6647

Publisher:: IEEE

Country of Publication:: United States

Language:: English

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