Tidal Turbine Bid Specifications 042916~1.docx

Massachusetts Maritime Academy Purchasing Department 101 Academy Drive Buzzards Bay, MA 02532

REQUEST FOR RESPONSE (RFR)

RFR 16-05

FOR

Tidal Energy Instream Turbine and Switch Cabinet Set

Issued May 2, 2016 Proposals Due: May 16, 2016 Contract Award : May 2016 (TBD) Technical Contract:

Tom Pham Project Officer Project Officer, Marine Operations 508-830-5000 x: 2147 tpham@maritime.edu

Solicitation Process Contact:

Paul Airozo, Director of Purchasing and Contracts 508-830-5051

508-830-5088 (FAX)

Tidal Energy Converter Set for Mass. Maritime Academy

Consisting of 1 (one) Instream Turbine and 1 (one) Switch Cabinet

Technical Specification

Customer: Mass. Maritime Academy

Project: Mass Maritime Tidal Turbine

Contact Person: Tom Pham

Table of Content Tidal Energy Converter Set for Mass Maritime Academy

1. SCOPE OF SUPPLY

1.1.

1.2.

1.3.

1x Instream Turbine

1x Switch Cabinet In addition we supply:

2. TECHNICAL DATA & DESIGN DESCRIPTION

2.1.

2.2.

2.3.

2.4.

2.5.

2.6.

2.7.

2.8.

Turbine Overview Coordinate system

Turbine Parameters Component Functional Description

Control philosophy Turbine operation characteristic (mechanical values)

Efficiency Interfaces

3. ENVIRONMENTAL CONDITIONS

3.1.

3.2.

Operation conditions

Non Operational conditions

4. MAINTENANCE

4.1.

Service Intervals

5. TECHNICAL DOCUMENTATION

5.1.

5.2.

Installation documents Operating Manual

1. SCOPE OF SUPPLY

1.1. 1x Instream Turbine

1.2. 1x Switch Cabinet

1.3. 1x Passive Swivel for Turbine

1.4. In addition we supply:

Lifting eye Rotor Lip seal system Rotor shaft bearing 2 stage planetary gearbox Generator Multidisc brake Brake HPU

2. TECHNICAL DATA & DESIGN DESCRIPTION

2.1. Turbine Overview

2.2. Coordinate system

Z

Y

X

Figure 1 - Co-ordinate system for hub loads

2.3. Turbine Parameters

Note: The final weight will be determined in the installation proposal drawing

2.4. Component Functional Description

TURBINE

Slow Speed Shaft The slow speed shaft transfers torque and rotational speed from the rotor towards the gear set and thrust forces from the rotor to the bearing system. It will be built from non-corrosive cast iron (GGG NiCr20-2) as the slow speed shaft is exposed to the sea water at the blade connection area.

Turbine Shaft Sealing A set of lip seals is preventing the ingress of water or an oil leakage on the slow speed shaft. The set consist three lip seals, running on a tungsten carbide coated liner of stainless steel. Two lips are facing towards water, one lip is facing towards the gearbox oil.

Turbine Shaft Bearing The slow speed shaft is supported by two ball bearings in an O-arrangement.

Ball bearing provide minimum friction for early cut-in Drive Train Housing The drive train housing supports the bearing, sealing, gear set and generator.

The grey cast housing (GGG40) transfers all forces and moments from the drive train to the support structure. All static interfaces are sealed with O-rings. The housing will also provide hoisting points to lift the turbine. A removable lifting eye on the housing allows for handling when turbine is horizontal.

Planetary Gear Set A two stage planetary gear set is used for torque reduction between the slow speed shaft and the generator. Each stage consists a fixed annulus gear, the cage with three planet wheels is driven by the power input. The sun wheel is driving the high speed side.

Cooling and Lubrication

The gears are lubricated by a common oil sump together with the slow speed shaft bearings. The oil is cooled with the drive train housing passively by the ambient water. Ferruginous particles will be separated from the gearbox oil at a magnetic plug. A further active filtering is not foreseen to reduce the complexity of the system.

The stator windings of the generator are cooled with the generator housing passively by the ambient water.

Generator The three phase generator is an induction type. The housing is specially designed for a submerged application including all external loads and the surrounding pressure. The A-side of the generator housing will be flanged to the drive train housing. The B-side provides an optional shaft end for the break system. All statically interfaces are sealed with O-rings against the surrounding water. Sufficient cooling is achieved by the ambient water.

The generator will be sealed with lip seals at the input shaft against the gearbox oil.

Dry mate connector sockets (Type STS subsea; XSK-1/0-MP; bulkhead male) are mounted to the generator. One per phase + ground; in total 4.

Note: The generator cables with plugs are not scope of SHY supply.

Multidisc Brake System

The full service brake is located on the B-side of the generator. It is engaged spring loaded and will be lifted hydraulically during operation of the turbine. The hydraulically power unit is located at the brake.

Note:

The brake wear limits the brake to 100 full load brake operations within one maintenance interval. The actual service life of the brake discs is strongly depending on operation cycles and outer circumstances. The number of brake cycles together with the related engaging speed are monitored for further evaluation.

Reasons for Braking:

Automatic braking due to quasi-static over speed (Brake engages, when continuous water speed was exceeded for a reasonable time period (e.g. 20 seconds).

Note: The stated 20sec is at this stage of development an assumption and need to be investigated in further development and testing procedures.

Automatic braking due to dynamic over speed (Brake engages immediately , when cut out speed is reached once)

Remote controlled park mode (bad weather forecast)

Emergency stop button

Grid loss

Electrical single failure on one turbine. Only the faulty turbine will stop. The others keep running.

Pressure drop in hydraulic system (hydraulic failure)

Brake release:

slack tide. Next slack tide will be determined by using a 6hours timer integrated in the Software.

If brake will engage again in the next tidal cycle, the release must be released remote controlled by acknowledgement of human operator

Switch Cabinet (SC)

General note: The SC is designed to enclose all systems to operate one TURBINE. To achieve a safe and reliable remove or replacement of the turbine the turbine is equipped with dry mate connector sockets.

Switch Cabinet Housing

The housing is carried out in IP54 and is suitable for outdoor applications. The major components are shown in figure below.

Part 1 & 2: LFC(1) and LFM(2) are the grid filter Part 3: AIC is the inverter to the grid Part 4: Inverter for the turbine

Size of the cabinet will be roughly: 1500x2200x800 (WxHxD) Weight estimation: 600kg

Part 3

Part 2

Part 4

Part 1

Air Cooled Inverter

Air Cooled Grid Inverter & and Filter PLC Turbine Control & Grid Module Cooling System

Turbine is controlled using an air cooled inverter. The inverter provides frequency control with the following functionality:

The combination of the grid inverter and the filter make sure that grid ready power is produced

The operating system of the turbine is running on an on-board controller.

A suitable air conditioning and heating system will provide proper environmental condition inside the cabinet

Corrosion prevention

Coating of external surfaces

Surfaces of rust vulnerable materials, exposed to the seawater are threatened as follows:

- sand blasting SA 2 ½ acc. DIN EN ISO 12944-4: 1998-07

(2K Epoxy-resin)

Passive Swivel General note The passive swivel allows SIT 250 turbines operating in an downstream arrangement to passively yaw around its vertical axis. The turbine will be pulled passively by the current and will thereby be aligned into the flow direction. The swivel will feature two flanges. At one flange the turbine is connected whereas the other flange is for the mounting of the swivel to the platform.

Functional principle

Flow direction

180° 0°

180°

0° Flow direction

2.5. Control philosophy

To limit the power of the turbine, the frequency controller is used to reduce the generator torque and thus allow controlled overspeed at water velocities above the nominal speed.

Power control by over speed Figure 2 illustrates the control strategy which is implemented to drive the generator. It can be seen that between zero and nominal power the power increases cubical and with flow. The turbine is used at its maximum coefficient of power.

Above the rated water speed the power is held constant. A further more increase in flow velocity will not lead to higher power levels.

The point above rated flow velocity respectively rated power (Rotor in controlled overspeed) is achieved by a constant product of electrical voltage and current torque limitation by current limitation of the inverter. Because of the fact the rotor increases the speed of the shaft when v > vnominal but inverter increases not the output voltage in proportional to the speed of the shaft the generator works in “field suppression”. The result is that the torque at the shaft decreases its torque with 1/n.

Figure 2: Control strategy power limitation

Characteristics of the control strategy “Over speed”:

Torque control The torque control strategy described in Figure 3 below is a compromise to utilize the high power output of large rotors at slow water speeds whereas the torque peak around the nominal water speed will be cut off. Given this the drive train can be equipped with a larger rotor while the power output is reduced only in a small speed range. The values v0, v1 and v2 are given in section 2.3.

v0 v1 v2

Zone 3Zone 1 Max utilization cp=cpmax Zone 2 Torque control

Power control

M~v²M=const.

M~1/n

P~v3 P~v P=konst.

Figure 3: Control strategy torque and power limitation

2.6. Turbine operation characteristic (mechanical values)

Dynamic velocity limit or without brake vmaxdyn=6.0 m/s

Continuous velocity limit with brake vmax=4.4 m/s

Figure 4 Turbine operation characteristic D=4m

2.7. Efficiency

2.8. Interfaces

Type STS subsea; XSK-1/0-MP

Type STS subsea; moulded MetOcean connector, Size 14, 12 pole, male

3. ENVIRONMENTAL CONDITIONS

The design of the TURBINE is based on a generic design envelope which allows for high adaptability to any project.

3.1. Operation conditions

Design Load Case Conditions To be defined

Further water properties

Seawater

(high temperature design allows for unrestricted worldwide application)

Accelerations

Alignment

3.2. Non Operational conditions

Transport

Storage

Note: If the storage time exceeds 12 months the electrolytic DC capacitors need to be charged with caution. Therefore, such a long storage time is not recommended.

4. MAINTENANCE

4.1. Service Intervals

5. TECHNICAL DOCUMENTATION

5.1. Installation documents

5.2. Operating Manual

6. COMMISSIONING

Service engineer's assistance for 1 engineers, 3 day(s) in 1 trip, only for commissioning, is included.

7. EXCLUSIONS

FORM OF GENERAL BID

TO THE AWARDING AUTHORITY

A. The undersigned proposes to furnish all labor and materials required for the Massachusetts Maritime Academy, Buzzards Bay, Massachusetts, in accordance with the Contract Documents for a Tidal Energy Instream Turbine and Switch Cabinet Set for the contract price specified below, subject to additions and deductions according to the terms of the specifications.

B. This bid includes addenda number(s)

C. The proposed lump sum bid price is:

The undersigned agrees that, if selected we will within five days, Saturdays, Sundays, and legal holidays excluded, after presentation thereof by the awarding authority, execute a contract in accordance with the terms of this bid.

I

The undersigned hereby certifies that they are able to furnish labor that can work in harmony with all other elements of labor employed or to be employed on the work and that they will comply with all laws and regulations applicable to awards.

The undersigned further certifies under the penalties of perjury that this bid is in all respects bona fide, fair and made without collusion or fraud with any other person. As used in this subsection the word "person" shall mean natural person, joint venture, partnership, corporation or other business or legal entity. The undersigned further certifies under penalty of perjury that the said undersigned is not presently debarred from doing public construction work in the Commonwealth under the provisions of section twenty-nine F of chapter twenty-nine, or any other applicable debarment provisions of any other chapter of the General Laws or any rule or regulation promulgated thereunder.

Bidder Name: Date:

Bidder Authorized Signature:

Print Name and Title of Authorized Signatory:

CONTRACTOR AUTHORIZED SIGNATURE VERIFICATION FORM

Individuals: Individuals have two options to verify signature authorization:

1. Official Sample of Signature. Signature verification may be accomplished by submitting a copy of a driver's license, passport, social security card, business ID or other official form or identification containing the authorized signatory's signature, OR

2. Notarization. In the alternative, the Bidder can have their signature notarized in the space below.

Corporations. Corporations have two options to verify signature authorization.

1. Authorization and Clerk Certification: The Corporate Clerk may certify in the space below that they have witnessed the authorized signatory's signature (made in the Clerk's presence) AND that the signatory is authorized to execute contracts and other documents and legally bind the corporation. (NOTE: Clerks may not self-certify if they act as Clerk and as an authorized signatory. Alternative documentation should be submitted); OR

2. Authorization and Official Sample of Signature or Notarization (Complete both "a." and "b." below)

a. Authorization. The Bidder may attach a copy of a board of directors vote stating that each signatory is authorized to execute contracts and other documents and legally bind the corporation, AND:

b. Official Sample of Signature or Notarization. (Select one option) Official Sample of Signature. Attach a copy of a driver's license, passport, social security card, business ID or other official form or identification containing an example of the authorized signatory's signature, OR Notarization. Have each of the signatory's signature notarized (made in a notary's presence) below.

Partnership or Other Entities

1. Authorization. Attach documentation for each signatory of authorization to execute contracts and other documents and legally bind the partnership or other entity, AND

2. Official Sample of Signature or Notarization: (Select one option)

a. Official Sample of Signature. Attach a copy of a driver's license, passport, social security card, business ID or other official form or identification containing the authorized signatory's signature; OR

b. Notarization. Have their signature notarized in the space below.

THIS SECTION IS FOR NOTARIZATION OR CORPORATE CLERK CERTIFICATION

PRINT SIGNATORY'S FULL LEGAL NAME: _________________________________________

SIGNATURE: (as it will appear on documents) ________________________________________

(NOTARY) I, _______________________________________ as a notary public certify under the pains and penalties of perjury that I witnessed the signature of the aforementioned signatory on behalf of the Bidder , and the individual's identity was verified, on this date: ___________________, 20 _______. My commission expires on:

OR

(CORPORATE CLERK) I, _______________________________________ as corporate clerk of the Bidder/Contractor certify under the pains and penalties of perjury that I witnessed the signature of the aforementioned signatory and the signatory is authorized to execute contracts and other instruments and legally bind the Bidder/Contractor. This date: __________________________, 20 _______.

AFFIX CORPORATE SEAL OR NOTARY SEAL HERE:

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