1. Department of Electrical Engineering, University of California San Diego, San Diego, CA, USA
2. Department of Mechanical and Aerospace Engineering and the Center for Energy Research, University of California San Diego, San Diego, CA, USA
3. Grid Planning and Analysis Center, National Renewable Energy Laboratory, Golden, CO, USA
4. Department of Electrical Engineering, the Department of Mechanical and Aerospace Engineering, Center for Energy Research, University of California San Diego, San Diego, CA, USA