RENEWABLE ENERGY

RENEWABLE ENERGY

Reliability, Safety and Management Engineering and Software Development Services May 15, 2013

Main Activities

The Main Activities of REL renewable energy: Project development, Design, Construction, Supervision, Project management : Hydro energy Wind energy Solar energy and energy efficiency

May 15, 2013

″Kozloduy″ Hydro Power Plant  North-Western Bulgaria – on the NPP Kozloduy Site, on the End of the 7 km long warm-water discharge canal

→ Bypass Canal

″Kozloduy″ Hydro Power Plant (2)  Designed by Risk Engineering Ltd.  Hydraulic Equipment from MAVEL: Turbines and Generators

Power House

″Kozloduy″ Hydro Power Plant (3) Design

Vertical Section Through the Power House

″Kozloduy″ Hydro Power Plant (4) Design (2)

Horizontal Section Through the Power House

″Kozloduy″ Hydro Power Plant (5) Basic Data of HPP Technology Number of Units Turbine Type Runner Diameter Number of Runner Blades Nominal Net Head Nominal Discharge 1 Turbine Rated Power per Unit Turbine Rotations Generator Rotations Installed Output per Generator Generator Voltage

2 Kaplan 2500 mm 4 7,50 m 46,2 m3/s 2867 kW 183 min-1 750 min-1 3600 kVA 20 kV

″Kozloduy″ Hydro Power Plant (6) Building Site of HPP

″Kozloduy″ Hydro Power Plant (7)

″Studen Kladenets” Hydro Power Plant

“Studen Kladenets” HPP is the second power stage of Arda Cascade. The plant has been in operation since 1958.

During the period of 2006 – 2009 Risk Engineering carried out extension of the HPP by two new turbine installation.

″Studen Kladenets” HPP (2)

Турбина 16 MW

Екологична турбина 1,3 МW

HPP “Studen Kladenets” – new turbine layout


 A new penstock with length of 210,35m and diameter of 2800 mm placed in a tunnel is feeding the additional two units.

″Studen Kladenets” HPP (4) Main dimensions of the extension Length 20,96 m Width 25,25 m Foundation elevation - 18,30 Crest elevation +21,85 Monolithic reinforced concrete structure. Used materials : 480 t steel, 8200 m3 concrete 10000 m2 formwork Unit 5 - cross section

″Studen Kladenets” HPP (5)  Foundation rock is eroded andesite  Excavation was carried out by blast

Underground section of the building – 7900 m3

″Studen Kladenets” HPP (6)  External walls up to elevation +6,00 are reinforced concrete walls with thickness of 50 cm and were poured at once.  Reinforced concrete columns were poured at once up to elevation +11,63 as well.

Overground section of the building – 7500 m3


Roof formwork

″Studen Kladenets” HPP (8)  Steel penstock was concreted by using of self compacting concrete mixture. Drill injection works were performed contact and consolidation injection.

 Within the rehabilitation of HPP “Studen Kladenets” REL performed delivery, replacement and adjustment of 5 inlet valves.


Turbine Francis on vertical axis with rated capacity of 16 MW delivered by VA TECH HYDRO

Ecological hydraulic unit type Francis with rated power of 1,3 MW, installed by Risk Engineering


HPP “Studen Kladenets” after extension

″Ovcharovo-Svoboda″ Wind Farm Location  North-Eastern Bulgaria – the Dobrudzha Plane, on Arable Land, between the village of Ovcharovo and the village of Svoboda  Total covered area – 7800 ha

 Existing 110 kV Power Line Stretching through the Area  Geological Site Assessment performed

″Ovcharovo-Svoboda″ Wind Farm (2) Wind Data Two 60m High Wind Measuring Masts: • Wind Speed • Wind Direction • Air Temperature • Relative Humidity • Barometric Pressure Data available for about two years already.

″Ovcharovo-Svoboda″ Wind Farm (3) Wind Park Model  Variant with 44 Vestas V112-3MW Wind Turbines, Hub Height 119m  Installed Capacity of the Park: 44x3 MW = 132 MW  Using two different software by Modeling the Wind Park: Windographer, WAsP

Terrain Map of the Wind Farm and Wind Frequency Rose

″Ovcharovo-Svoboda″ Wind Farm (4) Wind Park Model (2)  Results: - Wake Losses in the Wind Park and of Each Wind Turbine - Mean Net Annual Energy Production (net AEP) for the Wind Park - Other Characteristics

″Ovcharovo-Svoboda″ Wind Farm (5) Wind Park Model (3)

 Resource Grid, gross AEP, over the Site from Ovcharovo-Svoboda Wind Farm for VESTAS V112-3MW Wind Turbine with Hub Height 119 m

″Ovcharovo-Svoboda″ Wind Farm (6) Realization of the Project  Erection of the Wind Park: for Two Years – Two Building Seasons  Grid Connection: • Building a New Substation 20/110 kV in Proximity to the Existing 110kV Power Line • General Written Agreement with the National Electric Company for the Connection of the Wind Farm to the National Grid Available  Feasibility Study Performed

″Ovcharovo-Svoboda″ Wind Farm (7) Feasibility Study Accumulated net Cash flow 350 300

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Accumulated Discounted net Cash flow 160 140

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Photovoltaic Installation  Capital City of Bulgaria – Sofia, on the Roof of REL office Office Building of Risk Engineering in Sofia

Photovoltaic Installation on the Roof

Photovoltaic Installation (2)  Designed by Risk Engineering Ltd.

PV Modules Assembly

 Equipment from “ER Soll”, Germany: - 198 Modules with Total Area 489 m2 and Total Weight 63 kg/m2 - Polycrystalline Silicon Cells, Each with Rated Power 3,65 Wp  Biggest Installations of Such Type in the South-eastern Part of Europe  Total Installed Capacity – 54,8 kWp

Photovoltaic Installation (3) Energy Production  Automatically Saved of the Data on Sunny Portal: http://www.sunnyportal.com

Daily Reports

Photovoltaic Installation (4) Energy Production (2)

Monthly Reports

Photovoltaic Installation (5) PV Installation

Photovoltaic Installation (6) PV Installation (2)

11 Photovoltaic Inverters

Debar PV Plant Capacity: 2.5 MW Location: Parvomay, Plovdiv Technical Details: • 290W monocrystalline panels: 8 680 pcs • 3-phase string inverters (max 13.8kW): 155 pcs • Grid connection at 20kV Commissioned in 2011

Elhovo 5 PV Plant Capacity: 5 MW Location: Elhovo, Yambol Technical Details: • 280W monocrystalline panels: 18 144pcs • 3-phase string inverters (max 30kW): 168 pcs • Grid connection at 20kV Commissioned in 2011

Elhovo 4 PV Plant Capacity: 4 MW Location: Elhovo, Yambol Technical Details: • 260W polycrystalline panels: 15 228pcs • 3-phase string inverters (max 30kW): 141 pcs • Grid connection at 20kV Commissioned in 2011