Lee Rashkin received his B.S. in Electrical Engineering from the University of Illinois in 2006, and his M.S. and Ph.D. from Purdue University in 2008 and 2014, respectively, with a focus on the stability of power systems with power electronic converter interfaces. He joined Sandia National Laboratories as a Postdoctoral Appointee in 2014 and became a Principal Member of Technical Staff in 2018. He currently supports work on analysis of advanced power systems and controls. He works on diverse power electronics projects including networked DC microgrid power flow analysis for the Secure Scalable Microgrid Testbed, power electronics development for the drive trains of electric vehicles, and analysis of shipboard electrical systems.
One the Artemis program’s objectives is to re-establish a human presence on the moon and a critical component of this mission is the development of a robust, independent electric microgrid to provide power. This presentation considers a system of interconnected DC microgrids that power a combination of habitation, mining, and fuel processing units to facilitate in-situ resource utilization (ISRU). These microgrids are be separated by 9-12 km and each contain photovoltaic (PV) sources, energy storage systems (ESS), and a variety of loads prioritized by their level of criticality. The separate microgrids need the ability to transfer power between themselves in cases where there are generation shortfalls, faults, or other failures in order to maintain power to loads critical to the safety of personnel and the success of mission goals.
This presentation considers a two-grid microgrid system consisting of a habitation unit and a mining unit separated by a tie line. It is directed by an optimal control that includes power flow controls on the tie line, dispatch of PV generation, and dispatch of non-critical loads. Then, these results are validated in hardware using the Secure Scalable Microgrid Testbed (SSMTB), a testbed that includes hardware emulators for a variety of energy sources, energy storage devices, pulsed loads, and other loads.
SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525.
Understanding of the issues with coordinated power transfer between distant DC microgrids and of the model predictive control strategy used to solve this issue. Validation of the control strategy using a hardware testbed.
