Tutorial Session II

Khai D. T. Ngo, Chair
Sunday, April 9, 2017

Grid Transformation through Power Electronics: Outlook and Technology Challenges

Rolando Burgos

Dushan Boroyevich

The increasing high penetration of power electronics in electrical systems, whether in standalone applications like transportation, or in distribution systems connected to the grid-- a result of the massive deployment of renewable energy sources over the past years, has brought to the attention the need to understand the different types of dynamic interactions that can be induced by them. CPES has a vast record going back to the early 1980s of studying and analyzing such phenomena in space, aircraft, and marine power systems, which more recently has been expanded into in grid applications. In effect, the latter will be the focus of this tutorial, which will present the dynamic stability assessment of AC systems using synchronous d-q frame impedance based analysis. Specifically, it will present the underlying theory governing the multiple possible interactions, featuring practical examples triggered by constant power loads, and also by grid-tied inverters injecting active and reactive power into the grid, addressing as well the varying stability conditions created by photovoltaic (PV) inverters and STATCOM grid compensators. A revision of newly developed d-q frame impedance measurement units (IMU) will be presented too.