In the power system, because of the difference of peak valley phenomenon,during the peak or trough of power consumption, making the electricity capacity shortage and excess respectively. In the process of this operation, a lot of energy will be consumed and wasted. On the other hand, with the increase of new renewable energy, and in order to improve energy efficiency, the development of energy storage technologies and energy storage power station is of great significance. In many energy storage power stations, the battery energy storage power stations have lots of advantages, such as the regardless of location, the advantages of adjustable capacity. Therefore, the study and design of battery charging and discharging control system for energy storage power is also very important. The main works are as follows:(1) The theory study on energy storage power station and batteryThe background of the subject, the energy storage status of domestic and foreign, as well as that of the energy storage battery charging and discharging control system research are introduced. Theory of the lead-acid battery(group)working principle and charge-discharge characteristics are researched, and battery charging balance and fast charging technology are analyzed. Finally the charging and discharging module is determined. The overall structure of a distributed architecture with the single battery charging and discharging mode is selected. The combination of constant current charging and fast pulse charging technique which can improve the efficiency and minimize charging time is chosen as the main charging method.(2) The hardware design of the battery charging and discharging control system for energy storage stationIncluding the structure design of several parts above, hardware circuit,selection of component. The parameters of battery charging and discharging process are important to the system control. System is mainly based on these data controlling the battery charging and discharging circuit switch on or off.Therefore a detailed design is carried out. For data collection part, the battery charging and discharging control module is responsible for collecting and sorting data, network coordinator is responsible for connecting the CAN bus battery charging and discharging control module on data, and data is compiled together for the monitoring center.The distributed structure not only improves the stability of the system, but also disperses the mandate of the system, improves the efficiency of the system.(3)The software design of systemThe network coordinator, battery charging and discharging control and data acquisition module, software development and interface design of the monitoring center are all included in whole control system software design.(4) The test and result analysisFinally, the system prototype is built, the whole system analysis and experimental result are tested. The charging and discharging control of this issue and general control were compared. The feasibility and advantages of the system is validated. |