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Town Island Project and HKU testing
Jin Zhong Dept. of Electrical & Electronic Engg.
The University of Hong Kong
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Power systems in Hong Kong
• Two power companies – CLP Power supplies electricity to Kowloon and
the New Territories, and several outlying islands. It employs a fuel mix strategy of coal, gas, nuclear and oil.
– Hong Kong Electric (HEC) supplies electricity to Hong Kong Island and the neighboring islands. It uses a combination of coal, liquefied natural gas and wind energy.
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Fuel mix of power generation in HK by 2006
• Total installed capacity: 12,644 MW – This data includes part of the capacity of units 1
& 2 of Daya Bay nuclear power plant and Guangzhou pump storage station.
• Fuel mix
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Renewable energy in HK
• Lamma island wind power, 800 kW, 2004
• Solar power system, 550 kW, 2010
Source: Hong Kong Electric
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Town island renewable energy microgrids
• Town Island (Dawn Island) is a remote island. One hour trip from Sai Kung Ferry Pier.
• Operation Dawn operates a non-profit drug rehabilitation centre.
Source: CLP Power
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Town Island RE microgrids
• Town Island is currently powered mainly by three diesel generators with fuel transported there by boat.
• Overhead line and submarine cable were considered not applicable due to scenery and ecological concerns, as well as high cost.
Source: CLP Power
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Solar and wind generations
• In 2008, CLP decided to use renewable energy to supply electricity to the Island using solar panels and wind turbines.
• Average daily solar radiation: 14.07 MJ/m² • Average wind speed: 23.4 km/h • Good enough for building a renewable
energy based microgrid.
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Two stage project – in total 192 kW
• Stage 1: 20 kW PV panels – Provides power to the existing Carmel Hostel,
chapel, kitchen and farming area. • Stage 2: 160 kW PV and 12 kW wind turbine
– Provides power to new facilities, hostels and visitor center.
• Co-generation scheme: solar + wind • Battery for excessive energy • Original diesel units are kept for back-up
purpose.
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Microgrid
Source: CLP Power
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HKU-CLP collaboration on Town Island project
• CLP and HKU research collaboration on Town Island renewable energy project
• Town island data • Test the system in HKU smart grid
laboratory
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Objectives of HKU-CLP Joint Research
Town Island System model development
Optimal sizing of wind turbine, PV panel and storage
Study of demand management
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Test the system in HKU smart grid lab
PV panel emulation
module
PV panel converter
AC grid interface
Control module
AC grid
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Some results of the project
• Data analysis – Solar radiation – Load – Battery SOC, etc.
• Model the town island stage 1 system in the lab.
• Further study the future stage 2 system base on historical data.
• Suggestions to the configuration and others.