Author ORCID Identifier:

https://orcid.org/0009-0000-7017-731X

Date of Graduation

12-2025

Document Type

Thesis

Degree Name

Master of Science in Electrical Engineering (MSEE)

Degree Level

Graduate

Department

Electrical Engineering

Advisor/Mentor

Mantooth, H.

Committee Member

McCann, Roy

Second Committee Member

Song, Xiaoqing

Keywords

Battery; Battery Energy Storage System; Grid; Power Electronics; Solar; Three-Port Converters

Abstract

The increasing deployment of distributed solar and energy storage systems has created the need for integrated power converters that can efficiently manage photovoltaic (PV) generation, battery energy storage, and grid-tied AC output. This thesis presents the implementation and validation of a 5kW non-isolated Three-Port Converter (TPC) adapted for residential solar applications. The converter consolidates three power stage into a high-frequency, compact architecture: a unidirectional boost converter for PV input, a bidirectional interleaved buck-boost converter for battery energy storage, and a configurable DC/AC inverter for 120Vac single-phase output. The system is controlled using a central controller implemented on a TI C2000™ TMS320F280039C MCU. This controller executes MPPT for the PV stage, dual-loop PI current regulation for the battery interface, PI voltage control for the DC bus, and a proportional-resonant (PR) controller with phase-locked loop (PLL) for grid-synchronized inverter operation. The converter is designed to operate at high switching frequencies of 130 kHz for the DC/DC stages and 87 kHz for the DC/AC stage—to reduce passive component size and improve power density. The full system was simulated in PLECS to validate functionality. A hardware prototype was assembled using pre-designed PCBs and off-the-shelf components. Initial testing verified PWM generation and experimental validation at NCREPT confirmed open- and closed-loop operation of the PV boost, interleaved BESS DC/DC, and unipolar inverter with a regulated 400V DC-link. Peak measured efficiencies were 99.16% at Vin = 350V, Pout = 4.7kW (PV boost); 99.32% at Vin = 350V, Pout = 8.1kW (BESS Boost); 99.38% at Vout = 350V, Pout = 8.2kW (BESS Buck); and 98.32% at Pout = 2.3kW for the inverter at 120Vac and 60Hz; waveforms exhibited clean transitions with minor EMI and a stable DC link. This work serves as a key step in advancing and optimizing the Smart Green Power Node (SGPN) platform at the University of Arkansas.

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