[1] Energynautics GmbH, Darmstadt, Germany
[2] Sandia Natl Labs, Albuquerque, NM 87185 USA
[3] Elect Reliabil Council Texas ERCOT, Taylor, TX USA
[4] Natl Renewable Energy Lab, Golden, CO USA
[5] GE Energy Consulting, Schenectady, NY USA
[6] Elect Power Res Inst, Charlotte, NC USA
[7] ENERCON GmbH, Bremen, Germany
[8] Tech Univ Denmark, Roskilde, Denmark
[9] EnerNex LLC, Knoxville, TN USA