| Solar energy system types |
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| (1) Stand-alone solar energy system |
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| *Definition: Non-reversible solar energy system equipped with capacitors |
| *Applied locations:Mountains,remote islands where the power plant electricity can not reach |
| *Operate mode:The system uses capacitors to load and recharge electricity at day time then discharge at night time,electricity |
| can be stored in capacitors. |
| *Design considerations: |
| 1.There are numerous points of considerations:Arrays,volume of capacitors,loading effect,climate |
| 2.Normal chargers do not contain MPPT and have lower conversion efficiency. |
| 3.Capacitors have short life spam >discharge 50% volume ratio per day>0.2C recharge ratio. |
| 4.When the solar energy efficiency is behind demands,the capacity utilization would be low |
| 5. Use Hybrid systems with diesel generators or wind energy are improvement method. |
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| (2)Grid connected solar energy system |
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| *Definition: Reversible,able to work with parallel solar energy system |
| *Applied locations:Where the power plant electricity can reach |
| *Operate mode:Electricity provided by solar energy system at day time then by ordinary power plants at night time.Ordinary |
| power plants become giant capacitors in this system. |
| *Advantages:The system is simple and does not need to consider safety factors;contains MPPT ,high conversion efficiency |
| as well as capacity utilization |
| *Dis-advantages:1.The system could shut down if electricity is cut off. |
| 2.Parallel inverter can not work with capacitors |
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| (3)Emergency prevention solar energy system |
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| *Definition : Inverter has power-reversing transmission function, equipped with capacitors,able to work with grid connected |
| or stand alone solar energy system |
| *Applied locations : Public facilities where require emergency preventions(lighting, water, communication ....) |
| *Operate mode: |
| 1.Hybrid energy system, high efficiency and high utilization , electricity provided by ordinary power plants at night |
| 2.Build enough emergency prevention capacitors if required ,generate and recharge from solar energy at day time if |
| suffered from long period of electricity shot down,then generate from power plants at night time |
| 3.Capacitors should be maintained daily without 100% discharge volume ratio, life spam can be therefore extended |
| 4.Dis-advantages :Complex system and higher costs |
