High-Penetration Renewables for Village Power – a Case Study Islanded Grid Wind Power Workshop Fairbanks – April 29, 2016
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High-Penetration Renewables for Village Power – a Case Study
Islanded Grid Wind Power Workshop Fairbanks – April 29, 2016
NTPC Colville Lake microgrid
– An electrical island! 50 km north of Arctic Circle
– 150 inhabitants
– 150 kW peak; 30 kW base load
– Diesel fuel delivery only by ice road
• Cost of generation ~$2.60 / kWh!
– New power station
• 2 x 100 kW diesels + 150 kW diesel
• 50 kW of solar in summer 2014 – expanded in 2015
2 Remote Microgrid Case Study - Colville Lake, NT
The need for storage
– Energy storage needed to maximize fuel savings
– Without storage a diesel must be running 24 / 7
• Covering sudden PV ramps
• PV curtailment likely in order to run diesel efficiently
• No possibility to cover entire load with PV
– RFP for 200 kW / 200 kWh ESS
3 Remote Microgrid Case Study - Colville Lake, NT
Project timeline
– Contract signed July 2014
– Saft Intensium Max 20M container 232 kWh with 240kW ABB PCS100
– Development of cold-weather package
• Insulation for –50°C
• Hydronic heating coil for glycol heating
– Delivery to Edmonton for integration December 2014
– Ice-road transportation February 2015
– Installation / commissioning September 2015
– Started diesel-off operation January 2016
4 Remote Microgrid Case Study - Colville Lake, NT
Importance of modeling
– Modeling allows fuel savings to be quantified
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0 5 10 15 20 250
50
100
150
Time (hr)
Pow
er (k
W)
PVPVnetLoadDiesel
0 5 10 15 20 25-100
-50
0
50
Time (hr)
Batt
Pow
er (k
W)
0 5 10 15 20 250
50
100
Time (hr)
SOC
(%)
65% fuel saved
0 5 10 15 20 250
50
100
150
Time (hr)
Pow
er (k
W)
0 5 10 15 20 25-100
0
100
Time (hr)
Batt
Pow
er (k
W)
0 5 10 15 20 250
50
100
Time (hr)
SOC
(%)
PVPVnetLoadDiesel
37% fuel saved
0 5 10 15 20 250
50
100
150
Time (hr)
Pow
er (k
W)
0 5 10 15 20 25-50
0
50
100
Time (hr)
Batt
Pow
er (k
W)
0 5 10 15 20 2520
40
60
80
Time (hr)
SOC
(%)
PVPVnetLoadDiesel
5% fuel saved
PV output
6 Remote Microgrid Case Study - Colville Lake, NT
Optimizing PV size
– ESS allows network operation without diesels
• Voltage-source 4-quadrant PCS sets frequency and voltage
• Allows PV array to be sized larger than connected loads
• How much PV is optimum?
– Used NTPC-supplied load and Enphase-supplied PV data
– Recommended PV expansion to ~130 kW
• Based on just avoiding PV curtailment on average production day
7 Remote Microgrid Case Study - Colville Lake, NT
The finished product
8 Remote Microgrid Case Study - Colville Lake, NT
Next steps
– Test PV curtailment functionality
– Quantify fuel savings
– Optimize design for future village-power installations
9 Remote Microgrid Case Study - Colville Lake, NT
Questions?
10 Remote Microgrid Case Study - Colville Lake, NT
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