Research On Drive Control System For Flywheel Energy Storage

Application and development of renewable energy power generation can save fossil fuel and reduce emissions. It is an important method to deal with fossil energy crisis and to achieve sustainable development. In order to promote large-scale and effective application of renewable energy generation, it is needed to reduce the side effects on the grid and users, due to its randomness and volatility. Therefore, energy storage equipments must to be installed to absorb excess power and release when needed, so as to ensure power system stability and quality of supply. In addition, energy storage technology is needed in the new application fields of electric power, such as electric cars, electromagnetic emission.Nowadays, the mainstream of energy storage technologies such as water pumped storage and chemical batteries are not ideal on the environmental and efficiency. With the development of material science, magnet levitation, control theory and power electronics, flywheel energy storage (FES) has become a focus in recent researches. It has the advantages of high energy density, high efficiency, pollution free, and flexible in application. Some foreign companies have begun to sell commercial products, but the domestic study remains immature in the stage of experimental research.In this paper, the basic structure and principle of flywheel energy storage was studied in the beginning. And based on the characteristics of FES, a permanent magnet brushless DC motor was suitable to be utilized. On the basis of theoretical analysis, the model simulation was executed with MATLAB Simulink to study the principals and control strategy of FES. And a drive control system was designed and tested, which consist of an IGBT based Bi-directional DC-DC converter, a IPM based three phase full bridge and a dual DSP based digital controller.In the thesis study, a test FES system was build with the prototype flywheel, drive control system, and other equipments. In order to carry out the experiments to test the control strategy and drive control system, the CCS software was used to program for DSP. The results showed the effectiveness of both hardware and software.