| Low temperature waste heat power generation technology based on Organic RankineCycle, commonly used in the recycling of industrial waste heat, geothermal, solar thermaland other forms of low-grade heat for power generation. As there are a wealth of wasteheat resources in our country, we can save a lot of energy and reduce pollution since thewaste heat energy is applications for our society fully. Waste heat power generationtechnique has got attention of scholars with the growing energy contradictions. This paperfocuses on the turbine and permanent magnet generator operating characteristics, it seteffective speed adjustment of the generator and realize waste heat power generation systemon the optimal state by the design of generator electromagnetic torque control strategy. Aexperimental platform for waste heat power generation system had been build. The papermainly research as follows:First, the analysis of the composition and operating principle of low temperaturewaste heat power generation system and the physical characteristics of R600a. The speedcontrol strategy of power generation is established combined with the characteristics of theORC system.Second, carrying on the analysis of the mathematical model and performance modelof the prime mover. The operation law, efficiency and types of factors that affect theperformance of the scroll expander had been discussed. Studying the the influence of theoperational parameters of the expander to the efficiency of generation systems.Thirdly, studying the mathematical model of PMSG and its basic theory of vectorcontrol. The optimization of PMSG electromagnetic torque strategy base on vector controlwas designed combined with characteristics of waste heat power generation system andscroll expander efficiency and simulating the result by MATLAB.Finally, got the related experimental data. Understanding the influence of inletconditions and the working fluid pump to the cycle system. Summarizes the control targetrotational speed of the PMSG that maximum output power in the testing system inlet conditions. Make it practice that both the turbine and PMSG can work in the optimalpower state since the waste heat source change at that time. The test efficiency is stable in7.4%. |
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