Research On Wind-Solar Complementary Streetlight Control System Based On Z-Source Converting

Forced by the pressure of the resources shortage and worsening environme-ntal pollution and in order to implement the sustainable development strategy, the use of renewable energy has become a focus of attention of people around the world. Among the renewable energy sources, wind and solar power technology has been rapid developed. However, a separate wind or solar power generation system is subject to random effects of wind and solar power, the reliability of operation is not so well. The solar and wind energy in the time-varying and geographical distribution are strongly complementary, which makes wind-solar hybrid power supply system overcomes the shortage of imbalance and unstablilit-y of single power generation system. Further more, it makes the storage of energ-y and non-interrupted power supply applied rational. Therefore, the design of wind-solar complementary streetlight control system is very necessary.This thsis describes the development background of wind-solar complement-ary streetlight system and overviews the the research status and development trend for the wind-solar complementary streetlight system at home and abroad-.The working principle and composition of wind-solar complementary streetlight system are described, the operation principle and characteristics for the wind tur-bines, photovoltaic arrays and batteries are discussed in detail, The wind turbines, solar cells and battery capacity are determined according to the local wind and solar resources and the design requirements of the system, ensuring the load demand condition, taking factors such as investment costs of wind generators and solar cells into account to achieve a reasonable match. The theory of Z source voltage regulator circuit is simulated and analysed. After analyzing the various parts of the system based on the principles and operating characteristics, sum up the practical operation of the control strategy, which is mainly for the control of battery and load control, the control of battery includes battery charging voltage control, charge-discharge process control,over-charging and over-discharge cont-rol, the remaining battery capacity of the display control and over-charge voltage temperature compensation control. The load control is realized by using a light-control and time control mode. According to the program and control strategy, combined with micro-computer control technology, taking MCU as the core of the wind-solar complementary street light control system to achieve software and hardware design. In the hardware design, the fan rectifier filter circuit, and the leaked load circuit, microcontroller peripheral circuits, drive circuit, voltage regulator circuits, status indication as well as the auxiliary power supply circuit are carried out. In software design, using a modular design program, the same function of the program segment is classified as a subroutine by the main program in order to achieve its call-related functions.Finally, the principle of verification experiment and the constant pressure experiments of Z-source voltage circuit are carried out.In the laboratory, the test platform is built,and some experiments are carried out. The control functions of the controller is tested.