Necessity of Solar Energy
1) Ready for energy crisis and exhaustion of fossil energy
(ill-balance of energy supply and demand, exhausted in 50 years)
2) Consolidation of Environmental Regulation
(Kyoto Protocol to the United Nations Framework Convention on Climate Change)
Features of Solar Energy
1) Unlimited and Economic Renewable Energy
2) Pollution Free and Environment-friendly Resource (No CO₂emission)
3) Minimum spatial limitation, short construction period
4) Easy Installation, No Maintenance, Low Operating Cost
5) Flexibility of power generation capacity
6) Easy expansion and movement
Business Environment
Law to prevail and promote alternative energy
-Regulation of mandatory use of the alternative energy (5%) for the public institution
-A certification for an alternative energy equipment
-Recompense for alternative energy generation cost
Restriction of CO2 emission
-Kyoto Protocol (2005. 2.)
Increasing demand for solar power
-Expansion of demand from government ( 5% of total construction cost)
-Support from the government (100,000 solar houses)
-Demand from province self-government (Mandatory to setup solar street lamp)
-Private demand (Apartment, public facilities)
Various Applications
-Streetlamp, Solar industrial equipments, Solar pring, Solar Leisure Item, Solar Ad Panel
Types of the System
1) Commercial Line Link Type
Sell power when Pgenerated > Consumption
Buy commercial electricity at night and bad weather period
No need for battery and charge controller
Site : urban area (building, domestic system) where the commercial power line is available
2) Standalone Type
Use the generated solar power and stores it to a battery during daytime for nighttime power demand
Need batteries and a charge controller
Lighthouse, com. station, street lamp, wireless phone, remote island, buildings, large scale solar plant at the industrial area
Main Parts of Solar Power System
Solar Module
-Generate DC power with solar energy
-Power is proportional to module area and radiation intensity
Charge Regulator
-Protect battery from over-charge and over-discharge
-Charges battery with generated power by solar module
-Controls discharge current
Battery
-A storage for generated power
-Offers power to the load at the night
Inverters
-Convert generated DC power to AC current
-Cuts over-current
-Special inverter for line-integrated system
Wind Generator
-Generate DC power from wind flow
-Power is proportional to wind speed
Lamp
-Convert electric energy to light with stored energy in battery
Briefs of Solar Power System
Definition
-Power conversion from solar to electric energy
-Various Types (Standalone, Line related, Hybrid)
-Residential house, building, power for remote island
-Power source for a communication station
Composition
Solar Lighting System
Definition
-Street lamp lighting system powered by electric energy that is converted from solar light by the photovoltaic module
Composition
Solar Street Lamp (Hybrid type)
Definition
-Generate power by both of solar and wind energy according to weather conditions
Mutual supportive function between solar and wind power system
Features
-No spatial, time limitations
Relatively low restriction for installation
