| Summary: | 碩士 === 國立臺灣大學 === 生物產業機電工程學研究所 === 104 === To reduce the negative impact caused by global warming on the environment, the governments of many countries in the world have already initiated many renewable energy projects. In most cases the use of renewable energy such as power generated by photovoltaic (PV) panels is able to considerably reduce certain carbon dioxide emissions. This merit makes PV panels a reliable energy source and an efficient mitigation lever against global warming. Since 2012, the Ministry of Economic Affairs of Taiwan has also developed a renewable energy program, which aims to build and promote a series of solar systems in real industrial implementation. The location of a solar system and the surrounding environmental factors directly affect the efficiency of energy conversion. With the limitations on resources and budgets, to monitor the energy generation of solar photovoltaic systems in real time, it is necessary to ensure the status and stability of the systems.
Wireless Sensor Network (WSN) is one of the technologies often used in the studies on monitoring systems, and it has the advantages of small sizes, convenience of setting up, and low cost. Sensor nodes can provide information of electrical and environmental parameters. In an ideal situation, the maximum power points (MPPs) must be quite close for PV panels manufactured by the same material and located in similar environments, if the same algorithms of maximum power point tracking (MPPT) are used. But in a practical situation, the MPPs might be different due to rapidly changing environmental conditions. This study therefore purposed a voltage synchronizing technique for solar systems, through which the errors of MPPT algorithms caused by a rapidly changing environment could be avoided, and the technique could increase the power generation efficiency of solar systems.
Moreover, the concept of IoT was applied to the development of the voltage synchronizing technique. The technique allowed the systems to communicate with each other to achieve the goal of monitoring and optimizing the systems based on the IoT technology. The voltage synchronizing technique this study was applicable to all MPPT techniques. The technique could increase the total power generating capacity of solar systems.
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