Research
My research interests encompass modeling and control of power electronics systems, battery energy storage system, microgrid, high-frequency power converter and data center power system.
My Featured Publications
AC Stability Analysis and dq Frame Impedance Specifications in Power-Electronics-Based Distributed Power Systems
This paper shows that for a three-phase power-electronics-based distributed power system, impedance matrices of subsystems can be designed as diagonal dominant. Therefore, the ac system can then be treated as two decoupled dc systems. As a result, load system impedance specification criteria developed for dc systems can be readily applied to ensure stability in ac systems.
Analysis of D-Q Small-Signal Impedance of Grid-Tied Inverters
This paper unveils an interesting and important feature of three-phase grid-tied inverters - namely, that its q-q channel impedance behaves as a negative incremental resistor. An example shows that under weak grid conditions, a change of the PLL bandwidth could lead the inverter system to unstable conditions as a result of this behavior.
