T2: Power System Support Functions of Distributed Energy Resource Inverters

8:30AM - 10:20AM
Monday, June 3rd, 2019

Liuchen Chang, Shuang Xu
University of New Brunswick, Canada



In recent years, interests in exploring renewable energy in power systems have grown in response to increased global energy demand and concerns for the environment. Distributed energy resources (DER) based on renewables have experienced rapid growth over the past decades due to their abundance and low emissions. The intermittent nature of renewable resources presents issues regarding the grid reliability, flexibility and power quality. High penetration of renewable DER systems makes the grid more vulnerable and demands more system resources. Standards have been updated for grid interconnection of DER inverters with power system support functions, which requires DER systems to be controllable with high flexibility, functionality and reliability. This tutorial provides an overview of the power system support functions from renewable-based DER inverters. These functions are classified as: voltage regulation by active/reactive power control, frequency regulation by active power control, voltage ride-through, frequency ride-through, and other support functions. The algorithms for the power system support functions are presented, the benefits and drawbacks of each algorithm are compared with its predecessor, manifesting underlying logic in the evolution of the algorithms. An actual power system in a Caribbean country is used as an example in the case study, where these support functions are embedded in photovoltaic systems to help achieve the goal of 100% renewables in the country by 2030. The benefits for power system operation are demonstrated through simulation studies using the utility-grade software package of CYME.



Liuchen Chang received B.S.E.E. from Northern Jiaotong University in 1982, M.Sc. from China Academy of Railway Sciences in 1984, and Ph.D. from Queen' University in 1991. He joined the University of New Brunswick (UNB) in 1992 and is a professor in Electrical and Computer Engineering. He was the NSERC Chair in Environmental Design Engineering during 2001-2007, and was the Principal Investigator of Canadian Wind Energy Strategic Network (WESNet) during 2008-2014. He is a vice president of the IEEE Power Electronics Society. He has been a committed volunteer of IEEE since early 1990's.

Dr. Chang was a recipient of CanWEA R.J. Templin Award in 2010 for his contribution in the development of wind energy technologies, Innovation Award for Excellence in Applied Research in New Brunswick in 2016 for his contributions in smart grid and renewable energy technologies, and PELS Sustainable Energy Systems Technical Achievement Award in 2018 for his contributions in distributed energy systems. He is a fellow of Canadian Academy of Engineering (FCAE). He has published more than 350 refereed papers in journals and conference proceedings. Dr. Chang has focused on research, development, demonstration and deployment of renewable energy based distributed generation systems and direct load control systems.


Shuang Xu received the B. Sc. E.E. in 2012 from Hefei University of Technology, Hefei, China, and the Ph.D. in electrical engineering in 2018 at the University of New Brunswick (UNB), Fredericton, Canada. He is currently a Post-Doctoral Fellow at the Emera and NB Power Research Centre for Smart Grid Technologies at UNB. His research interests include renewable energy systems, energy storage technologies, power electronics, and power system support functions for distributed energy resources.