In solar street lights, the power controller is the core component of the whole system, responsible for the charging of energy storage devices and the discharging of the load task. At present, Japan, Germany, the United States and other developed countries for independent photovoltaic system power controller research Xin to focus on the following three aspects: to improve the output power of solar cells, improve the battery allow power strategy and improve system stability.
Through the study of different circuit topologies and advanced control algorithms, in the case of sunlight intensity, solar cell temperature and load changes, as far as possible to maintain the solar cell at all times the maximum output power state, that is, to achieve maximum power point tracking (MPPT).
The battery allow power strategy directly affects the life of the battery, research intelligent charging method, improve the battery charging acceptance rate, reduce the charging time, for the whole photovoltaic system working condition is of great significance. Independent photovoltaic systems are generally considered to be harsh environment, LED street lights, how to improve the stability of the system is also one of the most urgent need to solve the problem of all photovoltaic power controller researchers.
However, the PV power controller has been developed there are still many urgent problems to solve. In fact, the use of MPPT technology and battery charging strategy optimization of the problem of conflict, low energy utilization efficiency, battery charging and discharging method of unreasonable, the battery protection is not sufficient, these are the current market power controller common problems. In order to carry out comprehensive development and utilization of solar photovoltaic resources, the stability and reliability of the controller also needs to be further improved.
