Purpose Discuss and identify areas of collaboration on the NGIPS MVDC system architecture Understanding areas of risk in the MVDC architecture Perform risk mitigation utilizing modeling, simulation, validation and hardware in the loop testing

Key Research Issues for MVDC DC Bus Regulation Fault protection/Fault interruption System control System stability Energy Storage System isolation & grounding Load-centric power management techniques Affordability Thermal Management

ESRDC research in support of MVDC FSU Notional MVDC RT Simulation model development Location of ground faults in ungrounded DC system Electro thermal real-time simulation Insulation coordination in converter dominated systems MIT Parametric sensitivity and uncertainty analysis Thermal Loads for real-time simulation The Role of the Combat Power Monitor in Zonal Electrical Distribution MSU MVDC Hardware Testbed ( with USC) Develop methodology for optimal power management based on steady state power flow models of DC systems and controllers Develop a method to implement simultaneous inter-area decoupling and local area oscillation damping on MVDC systems Develop DC system fault detection and protection schemes Cable testing with DC waveforms

ESRDC research in support of MVDC USNA/PU Update Naval Combat Survivability Testbed from AC distribution system architecture to a medium voltage dc architecture Conduct a stability analysis and explore issues related to parallel dc sources. UT-Austin Develop definition of a practical MVDC system, DC Fault Protection, Reconfiguration, Load Sharing and Signal Analysis, Switching surges and insulation coordination Thermal management modeling and simulation USC MVDC PEBB based hardware test bed ( with MSU) MVDC VTB Pro based ship system model

MVDC, Red and Black Demos Red Demo Demonstrate and Test a Full Scale demonstration of an MVDC system Ending in 2010 5kVDC Distribution derived from 4,160VAC components Conventional energy management Red Demo plan approved, MVAC to MVDC transformation at the Land Based Test Site in Philadelphia, NAVSEA/NSWC, ending 3QFY09. Red Demo, TRL6, ending 3QFY10 (timing based on the MVAC demo schedule). Specifications, Standards, Interface Requirements, Test Infrastructure and all other documentation, ending 4QFY10. Black Demo Demonstrate and Test a Full Scale demonstration of a 10kVDC MVDC system Ending in 2015 Based on SiC, high frequency transformers, and compact power technologies. Dynamic power management

Purple Team Major Shipbuilders, NSWC, NAVSEA, ESRDC, and ONR Determine tool status and capability for ship system design Perform baseline round robin simulations to establish metrics Initiate a common Navy wide electrical system design environment Initiate a Navy Model library

Purple/ESRDC Provide baseline simulations for MVAC, MVDC, and HFAC systems Create translation, emulation, co-simulation, and etc tools as needed to create a common Navy design environment Help create the optimum model library – what is the form, fit, and functions of future models. Create models for purple team studies

Major Issues No tool consistency -- vendors, shipbuilders, Navy IP prevents model reuse and VV&A No system level design tools No physics in high level simulations