【作者】 于鑫；

【导师】 魏学业；

【作者基本信息】 北京交通大学 ， 智能交通工程， 2012， 硕士

【摘要】 当前全球的快速发展和人类对地球环境的更多关注使得人们对于可再生能源的需求已越来越大,这也推动了光伏产业和光伏技术的良好发展。光伏并网发电是当前被广泛看好的一种太阳能应用的方法。本文围绕单相光伏并网逆变系统的组建,对光伏并网逆变系统的组成、其升压逆变环节的控制、SPWM电流控制技术、孤岛检测作了原理分析和应用研究,设计了一种体积不大,功率较小的基于DSP的光伏并网逆变电源方案。升压环节采用了高频变压器升压电路,拓扑采用了推挽式变换。对推挽式电路的工作状态和其电路开关管的电压变化进行了较详细的分析,对功率开关管和高频变压器进行了详细的电路参数设计,对其工作原理进行了分析和运用。本文对逆变环节的控制策略进行了介绍,对控制方法进行了比较分析采用了单极性SPWM实行电流闭环PI控制。推导了所设计系统逆变环节的控制模型传递函数,由其可对PI参数进行整定。然后采用了全桥式逆变电路进行逆变,并完成了实验,对结果进行了验证。最后对孤岛效应进行了介绍和分析比较。图39幅,表1个,参考文献28篇。更多还原

【Abstract】 With the global rapid development and more attention to the earth environment, the demand for renewable energy has been growing. This promote the development of PV industry and PV technology.Grid-connected PV power generation is a widely promising method of solar energy utilization.Focusing on the set-up of single-phase grid-connected P V system, this paper gives theoretical analysis and applied research on the components of grid-connected PV system, the control of the booster and the inverter of the system, SPWM electric current control technique and islanding detection. It proposes a design of the grid-connected PV with low power and small volume based on DSP.The booster uses high-frequency transformer and push-pull mode is used as topology. The analysis of the work status of the push-pull circut and the voltage change of its MOSFET, as well as the circuit parameter design of MOSFET and the high-frequency transformer, are given in detail. The working principle is analyzed and applied.This paper gives an introduction to the control strategy of inverter, and a comparison of the control methods, and uses unipolar SPWM as a closed-loop PI control. It deduce the transfer function of the control modle which is belong to the designed system. Then the PI parameters can be setting. It uses full-bridge spacer ciruit to invert, make a prototype to test and verify. Islanding effect is introduced and compared at the end.更多还原