Speaker: Chuhan Peng
Time: 14:00, Jan. 21st
Location: SIST 1A-200
Host: Haoyu Wang
Abstract:
As global demand for clean energy continues to grow, distributed photovoltaic (PV) systems are attracting increasing attention. Among these systems, the microinverter serves as a critical component by improving energy conversion efficiency and reducing overall costs. Given the requirements of residential PV systems, the microinverter is desired to maintain continuous stable PV current, galvanic isolation, high power density, high reliability, low control complexity, and low component count.
Single-phase inverters inherently face a power mismatch between DC input and AC output ports, resulting in current or voltage ripples at the DC port that affect PV energy utilization. While traditional electrolytic capacitor banks address this, they have limitations in power density and lifespan. An alternative solution is to use the active power decoupling (APD) circuits, which transfer the mismatch power through an active switching circuit to other buffer capacitors. However, typical APD solutions require a nearly constant bus voltage, which necessitates complex control methods, posing significant challenges for the design of control systems.
In this talk, a novel quasi-single-stage DAB inverter based on an adaptive virtual bus will be introduced. This virtual bus features an adaptive voltage ripple at double the line frequency, allowing for a significant reduction in capacitance. Besides, the approach simplifies the control system, significantly reducing the number of required sensors.
Bio:
Chuhan Peng received the B.S. degree in electrical engineering from Zhejiang University, Hangzhou, China, in 2022. He is currently working toward the master's degree in Electronics Science and Technology with the School of Information Science and Technology, Shanghaitech University, Shanghai, China.
His research interests include microinverter in residential photovoltaic systems.
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