| The compressed air energy storage power generation system coupled with solar light and heat can be used to cut peak and fill valley,two frequency modulation,renewable energy dissipation,cold and power CO supply,small experiment and so on.At present,the efficiency of compressed air energy storage power generation system below MW level is less than 50%,so small power compressed air storage power generation system can be used.The application of electric system is limited.In order to improve the efficiency of the compressed air energy storage power generation system and make the space structure more compact,this paper will study a kind of equipment which is compact and capable of completing the expansion process efficiently.The main work of this article is as follows.First of all,the research status of expansion power generation technology at home and abroad is compared and analyzed.In view of the integration of expander and generator,that is the technology of expansion generator,the characteristics,structure and transformation mechanism of the expansion generator are expounded.Then,the thermodynamic characteristics of the expansive power generating unit from expansion to power generation are analyzed.The technical requirements of power electronic converters are determined by studying the output characteristics of the energy conversion of the expansion power generation integrated machine.The topology of the power electronic converter,which is suitable for the integration of the expansion generator,is studied,and the control strategy of the expansion generator is put forward to realize the speed tracking and power transmission and control of the energy conversion system of the expansion generator.Finally,the energy transformation mathematical model of the expansion power generation integrated machine is built,and the simulation and experimental platform is built.The simulation and experimental waveforms are given and analyzed.The research shows that the air to electric direct drive energy conversion system based on the expansion generator is greatly simplified in structure,reduces the energy loss in the middle link,and improves the efficiency of the system at the same time.The system adopts the control strategy based on double PWM converter,which has good speed stability and output power control ability,and can meet the requirements of the energy conversion scheme of the expansion generator. |
