การออกแบบระบบการจัดการพลังงานสำหรับระบบเก็บเกี่ยวพลังงานแสงอาทิตย์ โดยรวมการติดตามหาค่าพลังงานไฟฟ้าสูงสุดและการประจุพลังงานลงแบตเตอรี่แบบ 3 ขั้นตอน

Abstract

In the flood monitoring and warning system, it requires batteries to be power sources of the system. Since the limitation of the capacity of batteries determines the lifetime of the system, the replacement of batteries are frequently occurred. It is the main problem of the system, especially when the systems are installed in a wide area and/or a remote area. Therefore, the renewable energy sources such as solar energy are used to solve the problems. However, these energy sources are not stable because of the climatic conditions, season, time and temperature. Therefore, to improve the stability of the system and reduce the battery replacement, the solar energy has to be combined with batteries. In this research, a solar energy harvesting system is proposed for charging the batteries. The main parts of the proposed system are the control of the maximum energy from the photovoltaic (PV) panel, the charging method to manage the faster battery charging and the energy management control. In this research, 3 basis converters are used. The boost converter is used for MPPT control with Perturb and Observe method (P&O) method. The buck converter is used for charging control of a main battery with voltage regulation and Three-Stage Charging method (TSC) for quick and safety battery charging. The bidirectional buck/boost converter and the auxiliary battery are added for power management proposes. The simulation and experimental results shows that system can work as proposed with the overall efficiency around 85%. Finally, it can be applied for the real flood monitoring and warning system.