【作者】 杨锋；

【导师】 杨金明；

【作者基本信息】 华南理工大学 ， 电力电子与电力传动， 2013， 硕士

【摘要】 本文以三相交流光伏水泵为研究对象，对光伏系统数学模型、最大功率点跟踪方法、三相逆变电压调制策略、光伏水泵系统拓扑结构与控制策略、光伏水泵控制器软硬件设计等问题进行了深入研究。在异步电机的稳态数学模型的基础上，建立光伏系统各模块的数学模型，提出了一种简化的光伏水泵模型，为进一步提高光伏水泵系统的性能，以及系统结构到控制策略、降低成本、提高效率、最大功率追踪等方面提供有效的理论支撑。深入研究了光伏水泵的控制策略，提出了一种基于单片机的直接数字合成的分段同电压空间矢量脉冲宽度调制算法。为了提高异步电动机的效率，结合离心水泵的特点，推导出了不同电源频率时电动机最大效率所对应的转差率，由此给出电动机效率最优化的电源电压与频率的关系，还提出了可分段恒压频比曲线去拟合最优化曲线的工程方法方便获得电动机的最大效率。采用恒定直流电压的方法实现最大功率点跟踪，就电压闭环控制中PI控制器给出通用的设计方法。研究和设计了一套1.5kW的异步三相电机的光伏水泵控制系统，提出了相应的控制方法。为了提高系统的可靠性，逆变主电路采用了三菱公司的IPM（智能功率模块）模块，并设计了经济可靠的驱动和保护电路。控制保护核心芯片采用了凌阳公司生产的SPMC75F2413A单片机，设计完善的可靠、高效的软件算法流程。对光伏水泵系统进行实地测试，验证算法合理性和系统的可靠性，并给出了实验数据和波形。更多还原

【Abstract】 This paper introduced photovoltaic pump system which adopts3-phase inductionmachine and established the mathematical model of each module of photovoltaic pumpsystem. In addition, the paper also studied the maximum power point tracking method,three-phase AC inverter voltage modulation strategy, photovoltaic pump system structure andcontrol strategy, hardware and software design.Based on steady-state mathematical model ofthe induction motor,it established a simplified photovoltaic pump system mathematical model.This model provided an effective theoretical support to improve the photovoltaic pumpsystem’s performance, which included reducing costs and improving efficiency.After studiedthe control strategy of photovoltaic pump, a segment synchronization DDS SVPWMalgorithm was proposed.In order to get the maximal efficiency of the induction machinewhich drived centrifugal pump, a equetion on power frequency and slip had been deduced. Inaddition, this paper also presented a engineering optimization fitting method of segmentationconstant ratio of voltage and frequency.Using CVT to achieve the maximum power pointtracking, and proposing commen design method of PI controller voltage in closed-loopcontrol. It also designed a1.5kW photovoltaic pump system which adopts3-phase inductionmachine with the corresponding control method. In order to improve the reliability of thesystem, it used Mitsubishi IPM (Intelligent Power Module) module as the main circuit of theinverter, and designed an economical and reliable drive and protection circuit. Using Sunpluscompany production SPMC75F2413A as control and protection microcontroller withefficient software algorithm. At last it tested photovoltaic pump systems to prove algorithmand system’s reliability, and given the experimental data and waveform.更多还原