Kenneth Pedersen 3.2.3 Wave Power for the Western Cape · Wave Power for the Western Cape Kenneth...

23
Wave Power for the Western Cape Kenneth Pedersen PRESTEDGE RETIEF DRESNER WIJNBERG (PTY) LTD

Transcript of Kenneth Pedersen 3.2.3 Wave Power for the Western Cape · Wave Power for the Western Cape Kenneth...

Wave Powerfor the

Western Cape

Kenneth Pedersen

PRESTEDGE RETIEF DRESNER WIJNBERG (PTY) LTD

Presentation Outline

• Introduction

• SWEC– Original Development– Viability for Western Cape– Future Development

Introduction

Granger Bay

Lamberts Bay

SA Ocean Energy Research

• Creation of Ocean Energy Research Group

• Assessment of Wave Power Resource - 1978

• Initiation of Stellenbosch Wave Energy Converter (SWEC) Project - 1979

• SWEC Development and Evaluation – 8 yrs

• SWEC Project shelved – late 1980’s

Wave Power Levels – SA

20

30

45 13

12

Units: kW/m crest lengthPredominant Wave Direction

25

SWEC – Design Philosophy

• Must generate electricity at competitive cost

• Must avoid the need for costly over-design (extreme storm conditions)

• Must preferably utilise high in-shore energy levels

SWEC – Design Philosophy

• Must not interfere with shipping routes and fishing industry

• Must be within local technological capability

• Must have minimum visual and environmental impact

SWEC -One “V”

Air Ducts

Chambers

Submerged CollectorArms - “V”

WaveDirection

Mounted on Seabed

Water Depth: 15m – 20m

1.5 km from shore

Water LevelOscillates

High P

Low P

AC Electric Generator

Seabed CableAir Turbine in

Generator Tower

Wave Crest

High Pressure Phase

TrappedAir Pocket

High PressureAir Duct

SWEC - Concept

Wave Trough

Low Pressure Phase

TrappedAir Pocket

Low PressureAir Duct

SWEC - Concept

-

Model Studies – 2D

-

Model Studies – 2D

-

Model Studies – 3D

Proposed Site

National Grid

Power Stations

Wave Powerfor the

Western Cape

SWEC -Array Collector

Substation

Sea

bed

Cab

le

Shore Line

National Grid15

00m

Wave Direction

SWEC “V” Units

Constructionand Installation

1. Pre-cast units to be constructed in a casting harbour in Saldanha Bay.

2. Towed to site suspended from a placement barge.

3. Lowered onto prepared bed.

4. Connected to adjacent unit and secured (ballast rubble or piling).

Placement Barge

Example of SubmersedTunnel Construction

Installed Unit

Unit suspendedfrom Barge

SWEC – Power Generation

One “V”Total

(40 km)

Rated (Design) Capacity

5 MW 770 MW

Annual Average

2 MW 308 MW

Winter Average

2.9 MW 450 MW

Generating Costs

• Wind PowerActual (2006): 50–60 cents / kWh

• Wave Power (SWEC)Pre-feasibility (2006): 60–75 cents / kWhFeasibility : To be determined

SWEC – Future Development• Phase 1: Feasibility Study

• Phase 2: Detail Design (5 MW Demo Unit)

• Phase 3: Implementation (5 MW Demo Unit)

• Phase 4: Testing (5 MW Demo Unit)

• Phase 5: Implementation (770 MW)

SWEC - ProgrammeYear 1 Year 2 Year 3 Year 4 Year 5 Year 6 Year 7 Year 8 Yea r 9 Year 10 Year 11

SWEC Phase 1

Development Phase 2

Phases Phase 3

Phase 4

770650

520390

260

Rated Output (MW) 1305

Phase 5

Wave Energy for the Western Cape

Discussion

PRESTEDGE RETIEF DRESNER WIJNBERG (PTY) LTD