American Traction Systems. DC Bus Capacitorss. Total. Dual Chopper Module. Dual. Inverter. 750kW. 750kW Generator Module. Module

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1 EFFECTIVE DATE JULY OF 8 Dual Hybrid Ship Propulsion System 750V BUS Generator Generator Propulsion Propulsion Bus Capacitorss 50,000µF Total Traction Inverter Dual Inverterr e Power Inverter L Dual Chopper L2 Induction Generators Precharge Contactor Panel Engine Engine2 Prop Prop 2 Bow Thruster 600A EMC Filter 600A EMC Filter 3Ø Filter EMC Filter Battery Disconnect Panel Υ Transformer 4-wire 277/480VAC Battery Rack # Battery Rack #2

2 EFFECTIVE DATE JULY OF 8 System Generators Each diesel engine is coupled to an induction motor of matching power capability. The induction motor is used to crank the engine to a speed slightly above idle in order to achieve a smoke-free start. The induction motor is used as generator by operating at negative slip in order to absorb power from the diesel engine. Operation in the generator mode is possible over a speed range of 600 rpm to 800 rpm. The generator inverter provides magnetizing current for the motor and delivers its electrical output to the 750V bus. At least one of the generator inverters (the MASTER) executes a high-speed voltage regulation algorithm that adjusts the retarding torque applied by the generator so as to maintainn the bus voltage close to the desired setpoint. A generator that does not execute the voltage regulation algorithm (the SLAVE) receives a torque command transmitted to it from the MASTER. Propulsion Motors The propulsion motors operate at a speed commanded by the control head located at the bridge. The propulsion inverter converts power provided by the 750V bus to AC power of suitable voltage and frequency to achieve the required propeller speed provided the total capacity of all power sources is not exceeded. If the maximum power limit of all of the sources is reached, the commands from the control head are modified proportionally so as to remain within the limit but preserve the ratio of the propeller speeds if they are commanded to run at different speeds. to Converters (Chopper s) These are used to interface energy storage batteries to the 750V bus. The operating voltage of the battery is chosen so that it is always lower than 750V allowingg total control of the current that is drawn from the source. Each -to- converter is able to handle up to 500A continuously or up to 550A for 30 minutes. The -to- Converters have bi-directional current capability. The converters connected to the energy storage batteries are able to transition smoothly from discharge to charge according to the desired method of energy management. Each -to- Converter is connected to its power source byy three inductors and a soft-charge circuit. The inductors smooth the current flow in the source and the soft-charge circuit prevents the large inrush of current during initial charging of the 750V bus capacitors. Inverterr for House Power and Shore Power A module consisting of two inverters each having a capacity of 250kVA is used to provide on-board utility power at 60Hz and also to control a 00HP bow thruster motor (if applicable). The inverter used for utility power can also be back-fed through a 480V shore supply connection. In this arrangement, the inverter output is not active but the diodes of the IGBT modules function as a passive rectifier. The bus is charged to approximately 650V. Subject to the capacity of the shore supply connection, up to 50kW can be consumed from the bus for the purpose of battery charging, engine starting or operation of the propulsion motors at low power.

3 EFFECTIVE DATE JULY OF 8 Bus Arrangeme ent The bus is divided into three sections that are normally linked together to form a common bus. The port and starboard sections of the bus each connect to one propulsion inverter and one generator inverter. The middle section of the bus connects to all other devices: two dual choppers, dual inverte and 350HP inverter. Each bus section can operate independently of the other sections. The sections are linked by motorized isolating switches. These switches may be operated only when the voltage difference between one section and the other next to it is 00V or less. Isolation of a bus section is required only if a component failure has resulted in a short-circuit across the bus or a ground fault. If such a failure occurs in either the port or starboard section, the vessel may continue under way using one generator and one propulsion motor after the faulty section has been isolated. If such a failure mode occurs in the middle section of the bus, the vessel may continue under way using the two propulsion sections independently and with the emergency generator used to supply 60Hz power to onboard utilities. Isolator Switches Optionally, the system may have isolator switches. Two (+ + and -) are located between the port modules (propulsion and generator) and the middle power section (batteries and the 60Hz inverter). Two (+ and -) are located between the starboard modules (propulsion and generator) and the middle power section. These isolator switchess allow the operator to isolate the port from the starboard modules in case thatt one of these sides has stopped working. of Short Circuit Protection Both Over-Current and Short Circuit protection are designed to protect internal and external hardware from excessive currents. There are various reasons for excessive current to be generated in motor leads. Amongst them are: Stalled motor due to mechanical overload External short Internal short or failure of power device (IGBT) IGBT being turned on by failed gate driver circuit or any faultyy component in PWM signals processing Excessivee current due to a faulty current sensor Excessivee current transient due to an incorrect software setupp The major difference between Over-Current and Short Circuit protection is that Over-Current protection relies on measuring accurate current feedback by current sensors (CTs), while Short Circuit protection uses the resistance of the IGBT as the current measuring shunt, thus it can catch excessive currents that are not passing through CTs (internal short), and excessive currents that are due to CT failure. Over-Current protection is usually set at the rated current of IGBT or slightly above it. Short Circuit protection is usually set around the maximum rated peak current of IGBT.

4 EFFECTIVE DATE JULY OF 8 Generator and Propulsion Dimensions

5 EFFECTIVE DATE JULY OF 8 Dual Inverter

6 EFFECTIVE DATE JULY OF 8 Dual Chopper

7 EFFECTIVE DATE JULY OF 8 Specifications Generator Specification Rated Power Output Volts Frequency Range Voltage Range Power Duty Cycle at 460VAC at 0.85 p. f. 20 to 60Hz 90 to 50V / 3 phase 750A rms at 460VAC Control I/O 700 to 750V 700A at 730V Eight digital s Analog reference 24V programmable functions -0 to +0V Communication CAN-BUS System communication, Handheldd programmer Protective Functions Thermal Protection Motor Overload Overcurrent Protection Heat Sink Over-temperature Alarm at 75 C Electronic Time trip 200A AC Shutdown at 85 C Propulsion Specification Rated Power Output Volts Frequency Range Voltage Range Power Duty Cycle at 730V 500 to 800V 685A at 730V Control I/O 70kW at 460VAC at 0.85 p.f. 0 to 60Hz 0 to 500VAC / 3 phase 750A rms at 460VAC Eight digital s Analog reference 24V programmable functions -0 to +0V Communication CAN-BUS System communication, Handheldd programmer Protective Functions Thermal Protection Motor Overload Overcurrent Protection Heat Sink Over-temperature Alarm at 80 C Electronic Time trip 200A AC rms Shutdown at 85 C

8 EFFECTIVE DATE JULY OF 8 Dual Inverter Rated Power Volts 456kW Frequency Range Voltage Range Power Duty Cycle Eight digital s Analog reference CAN-BUS Thermal Protection Overcurrent Protection 500 to 800V 625Aat 730V Control I/O 24V programmable functions -0 to +0V Communication System communication, Handheld programmer Protective Functions Heat Sink Over-temperature Alarm at 80 C Shutdown at 85 C 600A AC rms Specification Output 225kW at 0.8 p.f. 60Hz 440 to 480VAC rms / 3 phase 353A rms at 460VAC Output 2 225kW at 0.8 p.f. 0 to 60Hz 0 to 460VAC rms / 3 phase 353A rms Dual Chopper Rated Power Volts Frequency Range Voltage Range Power Duty Cycle Eight digital s Analog reference CAN-BUS Thermal Protection Overcurrent Protection Control I/O 24V programmable functions -0 to +0V Communication System communication, Handheld programmer Protective Functions Heat Sink Over-temperature Alarm at 80 C Shutdown at 90 C 750A Output 700kW 600 to 750V 960A at 730V Specification s and 2 2 x 350kW 0 to 700V 2 x 500A