Theretic Study Of Motor Train Unit Of Solar Air Conditioning System

The solar air conditioning system, which draws more and more social attention because of its enormous social and economic benefits, is an important part of the application field of solar energy photovoltaic technique, while it’s also a major breakthrough for multiple unit to use solar air conditioning technique. On one hand, it expands the application field of renewable energy, which can save energy and play a positive role of alleviating global energy crisis. On the other hand, it can maintain indoor air conditioning as an auxiliary unit to ensure the passenger’s comfortableness.This paper researches on photovoltaic power system, then decribes the principles and composition of photovoltaic power system and photovoltaic generation, then analyzes the equivalent circuit model and mathematical model of photovoltaic cells’working in detail, as well as the influence of cell temperature, radiation intensity and series resistance on photovoltaic cells. Based on it, this paper builids a model in MATLAB/SIMULINK and makes key research on solar photovoltaic array by parameters of light intensity, ambient temperature and amount of photovoltaic array series parallel on this general dynamic simulation model, which makes comprehensive analysis of the simulation results and solve the limitations of the previous models that is only for specific photovoltaic array.Secondly, based on the instability of photovoltaic generation and combined with the principle of rotor field-oriented vector control system of induction motor and space vector pulse width modulation(SVPWM),this paper studies on speed control system for three-phase asynchronous motor which drives the compressor. The principle and basic theory of vector control are introduced. The mathematical model of asynchronous motor and the simulation model are also analyzed in this paper. The simulation of each part of photovoltaic power system and asynchronous motor vector control system are emphatically made. In this paper, study on the dynamic, steady state and governing characteristics of system and the influence of parameter variation on system performance will lay a solid foundation for exchanging theoretical study into practical research. Finally, the paper forms a complete solar air conditioning system that accomplishes the combination of photovoltaic generation and frequency control by single chip microcomputer system controlling.