Load

Generator (Gen1)

ESM (Battery)

ESM (Capacitor)

Cable

Circuit Breaker Location

Switch Board (SWBD)

Electrical System Architecture Modeling Authors: Adam Tucker and Tristan Scott, Code 326

Mentors: David Woodward, Code 326, Nathan Spivey and Dan Santosusso, Code 322 Shawn Plesnick, Code 323

Project Objective• Looking into the benefits of shared

energy storage in a Medium Voltage Direct Current (MVDC) Zonal Design

Project Approach• Perform literature search of past

ESM studies• Assist in creating MATLAB/Simulink

model representative of a FSC electrical distribution system

Literature Search• Ship Integration • Electrical Integration• ESM Technologies• Lessons Learned Spreadsheet

Energy Storage Module (ESM) Benefits

Distribution A: Approved for public release; distribution unlimited.

• Generators are not able to handle

repetitive transients of high magnitude

• ESM profile can source the spikes of the

load profile that the generator is unable to

support (Load Leveling, Peak Shaving)

• Aids Uninterruptible Power Systems

(UPS)

• Potential to reduce electrical/mission

systems total size, weight, and cost

• Single Generator Operations

Basic MVDC Zonal Architecture Simulink Model

Evolving Electrical Distribution Systems

Past and Present• Many individual loads with a

predictable power profile•Low variance •Smaller load size relative to generation

• Energy Storage required only for a few loads•Uninterruptable Power Supply (UPS) functions

•Power storage locally

Future• Need for energy storage continues

to increase•Electromagnetic Rail Gun (EMRG), Radars and Lasers

•Transient pulse loads• Increasing Energy Storage Modules

(ESM) into the distributed system could prove cost effective

ESM Technologies• Flywheels•Capacitor Banks•Propulsion Inertia Storage•Battery Systems

• Lithium Ion, Lithium Iron Phosphate, Lead Acid

Lead acid cells weigh 3x more than an equivalent lithium iron phosphate.

Future Work•Emphasize literature search on ESM equipment ratings

• Power, Energy, Charge/Discharge Rate, Size

• Ratings will be used in the Simulink model to be more representative of an electrical system

•Upcoming Challenges• Incorporating propulsion and rotor

Inertia Energy Storage into the model

• Incorporating the ability for ESM’s to handle negative power demand

• Incorporating multiple loads, generators, ESM’s, and efficiency

Load Leveling with High Pulse Profile

User Defined Parameters

• Electrical Architecture & Plant Alignment

• ESM capacity, location and electrical ratings

• Load profile definition

• Generator Power Ramp Rate

• Ship speed constraints

Outcome

• Equipment sizing and ratings

• Switchboards, loads, generator

and ESM’s

• Design feasibility

• ESM state of charge

Electromagnetic Railgun Testing

Battery Technology Comparison Chart

Example of Simulink Model

• Generator Load Profile

• ESM Load Profile• High Pulse Profile

LCC-19 Model VS-50 Oil Water Separator (OWS) Installand Analysis and Correction of Oil Water Transfer System (OWT)

Engineering Operation Sequencing System (EOSS) DiagramsCurrent Oil Water Separator (Model C-50) has operational deficiencies

Problematic “pull thru” vacuum type systemHigh repair and maintenance costsSingle speed operation, leading to inefficient oil-water separation

Equipment located atop separator itself. Pumps are unreliable and system is not truly integrated

Current Limitations Post-Upgrade Benefits “Push thru” VS-50 system eliminates most

operational deficiencies, as demonstrated on LHD-1 and CVN-70

Variable flowrate operation for increased OWS performance & effluent quality improvement

Sustainability and survivability due to the installment of reliable and efficient parts that are fully automated:• Automatic self-cleaning strainer

• Automatic pump priming system• Automatic Oil Content Monitor (OCM)

flushing system• Automatic system for removal of bulk oil

from Oily Waste Holding Tank (OWHT) to be discharged into Waste Oil Tank (WOT)

• Flange mounted float Tank Level Indicators (TLI)

Integration of all subsystems, such as OCM, TLI, and Pressure Reducing Station

Advanced user interface for ease of operation and reduction of operator error

Figure 3. (Right & Below) Photographs of (prototype) single VS-50 Oily Water

Separator system to be installed in Engine Room of LCC-19

Figure 7. (Above) User Interface Control System, designed to reduce operator error

(Above) Photograph of LCC-19, USS Blue RidgeSource: http://www.navsource.org

DISTRIBUTION A: Approved for public release; distribution unlimited

Figure 1. (Above) Model C-50 OWS System

Figure 4. (Left) Example of Oily Water Transfer Pump to be ripped out

and replaced.

Figure 5. (Right) Example of Oily Water Transfer Pump that is being used to replace older pumps (includes correct configuration of

hoses and isolation valves)

Figure 2. (Above) Model VS-50 OWS System and Fluid Flow Schematic

In order to fabricate label plates for all existing and new components on the ship, several Engineering Operation Sequencing System (EOSS) Diagrams were validated and cross-checked for accuracy. All discrepancies were accounted for via ship inspection, and are to be corrected to reflect the actual ship configuration.

OWSConversion from OWS Model C-50 to Model VS-50Addition of a self-cleaning strainer to reduce OWS maintenanceCorrosion resistant components (e.g. Relief valves to military specifications)PLC-based “smart” automated system

OWT SystemReplacement of Blackmer rotary vane OWT Pumps with more appropriate Megator sliding shoe pumpsOWT Pump configurations that allow for survivability in the event of component failures, including jumper hose connections and isolation valves

Proposed Upgrades

Due to the age of the ship, the current OWT system is unusual. A master “as-is” diagram was drafted to show all valves, components, and cross-connections to other systems as accurately as possible.

The team was able to coordinate with SRF-JRMC (Japan) to clear discrepancies between EOSS diagrams.

OWT System Diagram

Figure 6. (Right) Diagram of self-cleaning strainer

Erin Signor and Erin Donnelly, Code 631Mentors: Stephen Hopko and Ray Morales, Code 631