| This paper has introduced a Micro-grid system which consist of a3MW wind power generator, natural gas power generators and the energy storage unit. The system can supply the electric power in the production and living by itself. To run steady, the energy storage unit play a vital role in this system. So the paper focuses on how to choose the energy storage unit and the control principle.The intelligent controller, which is designed in this paper can keep the output smooth when the load change greatly. According to the operating condition and the change of the load, it can storage or release the energy automatically. It also can record when each battery pack charges or discharges. So it can make each battery pack has the same charge cycles and discharge cycles. It also can avoid batteries from over discharging or something that can affect the batteries’ service lives, thus raising the service life of the battery.After the theoretical exposition, this paper provide a complete set of design solutions, including the hardware design and the software development of the controller. The controller we discussed use the PWM signal modulation to control the IGBT trigger, so as to control how battery charge or discharge. At the same time, to adapt the micro-grid environment in which there are many battery packs, we design a master-slave mode for the controller. The master controller can control all the battery packs. That makes the output of the system steadily, and the transition between various operating conditions smoothly. To know system state quickly, this controller provides a128*64dot matrix liquid crystal display (LCD) output, RS-485MODBUS output, relay signal output, and the indicator light signals. This paper also provide a method to communicate with the upper machine. It can record the battery status in the computer when the system is running. So we can analyze in the future. After that, this paper builds a simulation platform to simulate actual working conditions in order to verify the reliability of the design.At the end of this paper, we summarize all the above studies, and propose some suggestions for the future. |
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