About Lecture: With the integration of distributed energy resources (DERs) and energy storage units in the grid, most inverters are operated under the grid-following type and controlled as a current source. High penetration of renewables such as PV inverters in the power system results in weakening the grid during grid faults. The inverter may disconnect from the grid and the grid reliability reduces significantly. To ensure reliable operation with DER integration in the grid, there are standards and grid codes to comply with. For instance, IEEE Std. 1547-2018 is applied to help maintain the grid voltage and frequency when DERs are integrated in the grid. This talk introduces an implementation of a grid-support function for controlling the inverter reactive current to provide voltage ride-through (VRT) of a grid-tied inverter-based microgrid while mitigating the inverter output current harmonics by combining the quasi-proportional resonant control and a feedforward function in the inverter controller, even if the grid voltage is distorted. By using PV and battery inverters, the microgrid VRT function is realized. The performance of the proposed method is validated by a real-time simulator with a hardware setup. Test results show that the microgrid can well perform VRT function while maintaining the sinusoidal inverter output current.

About Lecturer:

Gary W. Chang obtained his Ph.D. from the University of Texas at Austin in 1994. Between 1994 and 1995, Prof. Chang worked as a consultant in California, USA, and engaged in an EPRI Power Quality and a PG&E Distribution Automation project. He was with Siemens Power Transmission & Distribution, LLC., Minnesota, USA, from 1995 to 1998 and was in charge of resource scheduling functions of EMS/SCADA projects for electric utilities worldwide. He joined the Department of Electrical Engineering at National Chung Cheng University in 1998 and becomes the Chair Professor in 2020. Prof. Chang is the Senior Editor of IEEE Transactions on Power Delivery and an associate editor of IEEE Power Engineering Letters. He also has served as the guest editor for special issues of several IEEE Transactions. Prof. Chang is the past Chair of the IEEE PES Power Quality Subcommittee (2016-2017) and the past Chair of the IEEE PES Transmission and Distribution Committee (2019-2020). He has been actively engaged in the collaboration between academia and the local electric power industry. At present, he serves as the President of the Taiwan Smart Grid Industry Association. His areas of research interest include power systems optimization, power quality, renewable energy, and microgrid. Prof. Chang is an IEEE Fellow and a State of Minnesota-registered Professional Engineer.