【作者】 冯其塔；

【导师】 高晗璎；

【作者基本信息】 哈尔滨理工大学 ， 电力电子与电力传动， 2010， 硕士

【摘要】 随着“绿色环保”概念的提出,以解决电力紧张、环境污染为目的新能源利用方案得到了迅速的推广,而其中风力发电目前己经成为世界各国对可再生资源利用领域的研究热点,如何将不稳定的风能转化为可用的能与公共市电并网的电能是人们研究的焦点。本文主要以小型单相并网风力发电系统为研究对象,对系统的电机侧及网侧拓扑结构、控制策略进行了详细的分析和研究,在此基础上设计了基于DSP的2kW单相并网风力发电变流器。本文设计的系统包括两部分,即前级升压、稳压部分和后级逆变并网部分。首先风力发电机发出的变压变频交流电经三相不可控整流得到较低的直流电压,再经过升压型功率因数校正(Boost-PFC)环节使不控整流后的电流谐波降低且使直流电压升高,最后通过逆变并网控制环节得到可实时跟踪电网电压的稳定交流电。本文升压、稳压部分首先详细分析了Boost-PFC的工作原理,进而引出了本文重点研究的平均电流控制策略的概念和具体实现,同时对升压、稳压部分电路参数的选择作了理论推导和计算。逆变并网部分采用电流跟踪型的控制方式,详细分析了锁相SPWM调制的工作原理,通过软件锁相环技术采集电网电压以得到与电网电压同步的正弦波标幺值,与给定幅值相乘得到参考电流,该信号与变流器输出电流的采样值进行比较,通过数字式PI控制结合电网电压扰动补偿控制策略,消除市电扰动对并网电流的影响,以提高系统的动静特性。在所建立系统数学模型的基础上,利用MATLAB/Simulink搭建了系统仿真模型,对控制策略作了仿真分析,结果表明系统有功功率高,可接近单位功率因数并网。此外,为提高系统控制的实时性,采用高性能数字信号处理器TMS320F2812为核心控制单元完成采集、控制算法实现、实时SPWM波形生成等任务。根据系统总体设计要求,开发了小型单相并网风力发电的实验样机,并进行了实验研究。结果表明,单相并网变流器的功率因数高,系统运行稳定可靠,达到了预期的设计目标。更多还原

【Abstract】 With the concept of "Green and Environmental Protection" was proposed, all kinds of new energy exploitation program are in the rapid promotion, the wind power generation has become the hot research topic in the area of renewable resources utilization, and it has become the study focus on how to convert the variable wind energy into power which can be connected to grid. Based on low- power single-phase grid-wind power generation system as the research object, in this paper, the motor side and the grid side topology, control strategy carried out a detailed analysis and study.And design 2kW single-phase grid-connected Wind Power Converter based on DSP.This designed system consists of two parts, First part is the control method of the multiple boost convertor, And the second part is the control method of grid-connection invertor. Firstly it uses three phase uncontrolled rectifier to change the unsteady alternating voltage of the wind power generator into a direct voltage, then through a Boost- Power Factor Correction (Boost- PFC) converter, it boosts the direct boost to a high voltage and reduce the current harmonic, the final adoption of inverter and grid-connection control part to make the wind power of the generator following grid in real time.This boost, regulated part of the first detailed analysis of the working principle of the PFC in turn leads to focus on the average current control strategy and the concrete realization of the concept in this paper, while boost, regulated part of the circuit parameters made by theoretical derivation and calculations. The current-tracking control model is for grid-connection inverter part, a detailed analysis of the PLL SPWM modulation works, it gets software PLL voltage power grid in order to get synchronized with the grid voltage sine wave-unit values, which is used to compare with the triangle wave collected the reference current, the signal with the converter output current value of the sample compared, By PI control and grid voltage feed forward control, and the grid voltage feed forward control can reduce the grid interfering signal in favor of the system stability. Based on establishing a mathematical model of the system, using MATLAB / Simulink to build a system simulation model, the simulation of control strategy show that the system active power high, close to unity power factor grid-connection. Moreover, for the purpose of increasing the control efficiency, this paper uses high performance digital signal processor TMS- 320F2812 as the main controller to accomplish the control masks such as collection,analysis, implementation of algorithm, producing SPWM waves in real time, and so on.According to the requirements of the system design, development of low-power single-phase grid-connected wind power experiment prototype and conducted experimental study. The results show that single-phase grid-connected converter power factor high, stable and reliable system operation to achieve the desired design goals.更多还原