Stand-alone home electricity supply system using solar energy
As the global environment is deteriorating and the reserve of fossil energy resources keeps decreasing, renewable sources are promoted rapidly in recent years. Solar energy, as one of the most important renewable energy, appears to be the most promising energy resource due to its multiple advantages...
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| Format: | Theses and Dissertations |
| Language: | English |
| Published: |
2014
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| Online Access: | http://hdl.handle.net/10356/55306 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | As the global environment is deteriorating and the reserve of fossil energy resources keeps decreasing, renewable sources are promoted rapidly in recent years. Solar energy, as one of the most important renewable energy, appears to be the most promising energy resource due to its multiple advantages such as globality, sustainability and so forth. In this dissertation, a domestic electricity supply system which transfers solar energy from DC to single-phase AC is introduced. Equivalent circuit and mathematical modeling approach of PV cell are studied. A DC-DC boost converter is designed to realize the maximum power point tracking (MPPT) algorithm which guarantees that the PV outputs its maximum power on all weather conditions. There are quite a lot of ways to implement the maximum power point tracking, such as perturb and observation (P&O), increase and conductance (IncCond), constant voltage (CV) and so on. In this project, a bisection search method is introduced to improve speed in searching the MPP. Simulation of the DC side system is made by using 3 different MPPT methods. The simulation result of the DC part shows the pros and cons of each algorithm in tracking the MPP at various environmental conditions. Then a DC-AC inverter is connected to convert energy from DC to AC for households, and simulations of open loop and closed loop inverter are made. In the closed loop simulation, a proportional resonant controller is employed to stabilize the output voltage at 230V, 50Hz. The result shows a good sinusoidal wave with the desired amplitude and frequency under different load conditions. All simulations in the project are made in MATLAB/Simulink. |
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