光伏发电并网系统.doc
约91页DOC格式手机打开展开
光伏发电并网系统,摘要 目前，能源短缺和生态危机等问题已经引起了世界各国的广泛关注，人类正在不断寻求新的替代能源。其中，太阳能是大量应用的主要常规替代能源之一，而光伏发电并网技术是太阳能利用的主要发展趋势，必将得到飞速的发展。本文就对光伏发电并网系统进行了详细的介绍，并对系统控制算法、系统仿真、软硬件设计等方面进行了深入的探索。本文首先...
内容介绍
此文档由会员 违规屏蔽12 发布
摘 要
目前，能源短缺和生态危机等问题已经引起了世界各国的广泛关注，人类正在不断寻求新的替代能源。其中，太阳能是大量应用的主要常规替代能源之一，而光伏发电并网技术是太阳能利用的主要发展趋势，必将得到飞速的发展。本文就对光伏发电并网系统进行了详细的介绍，并对系统控制算法、系统仿真、软硬件设计等方面进行了深入的探索。
本文首先对光伏发电系统的结构以及工作原理进行了详细的介绍，根据并网逆变器的要求，确定适合本文的并网逆变系统的拓扑结构。
其次对系统的控制策略进行了深入的研究。基于光伏逆变系统的控制目标，分析了常用逆变器控制方式，并选择了SPWM控制方式作为本系统控制方式。对DDS原理进行了分析，采用等精度测频方法进行频率检测和基于等精度测频方法的相位检测。
本文还对光伏电池的工作原理进行了分析，得到光伏电池的等效电路和输出特性。通过对常用的最大功率点跟踪控制（MPPT）算法的分析和比较，提出了采用逐次逼近型算法来实现本系统的最大功率点跟踪，以提高系统的稳定性和快速性。最后应用DDS技术实现并网系统的频率、相位跟踪和最大功率电跟踪。
最后基于TMS320F2812高速数字信号处理器，对该光伏系统的软硬件部分分别进行了设计。硬件部分的工作中，本文详细设计了系统主电路和控制电路的结构、对参数计算进行了说明，完成了主电路硬件的设计。软件部分则给出了系统的软件流程图。本文对光伏系统进行了仿真建模，并对仿真结果进行了分析。同时对系统的SPWM控制方式进行实验，给出了实验结果。最后对本论文的工作进行了总结，指出该系统存在的不足，对以后的研究工作进行了展望。
关键词 光伏并网发电；最大功率点跟踪；逆变器
Abstract
The problems of energy resource crisis and circumstance pollution have been received extensive attention around world, and human should find new replace resource. Solar energy is one of the main replace resources of conventional resources which used widely. Photovoltaic(PV) generate electricity grid-connected technology will be the main utilization of solar energy, so it will be developed rapidly. Based on it, residential PV grid-connected system(PGCS) is introduced in detail and its control algorithm, simulation, hardware and software designs are researched deeply.
Firstly, the structure and operational principle of PV grid-connected generate system are introduced in detail. Based on the requirement of PV grid-connected inverter, the best topology of PV grid-connected system is chose. DDS principle is analyzed, using equal precision measuring frequency method for frequency detection, and based on the equal precision measuring frequency methods for phase detection.
Secondly, the control strategies of the grid-connected PV system are researched deeply. Based on PV system control targets, the common grid control methods are analysed, and SPWM control as control method of PV grid inverter is determined. The principle of DDS is analysed. At the same time, soft PLL is introduced in detail. The structure of Phase locked loop circuit and operating principle are researched. The tracks of frequency and phase are achieved by using DDS technology.
Moreover, based on the operational principle of PV cells is analysed, the equivalent circuit and performance characteristic are obtained. By comparising several traditional Maximum Power Power Point Tracking (MPPT) control algorithms, gradual approximation control algorithm is designed to achieve PV system of the maximum power output and improve system performance and maximum power point tracking speed. Finally using DDS technoloy to realize frequency tracking, phase tracking and MPPT of grid system
At last, based on TMS320F2182 high-speed digital signal processors, hardware configuration and control stratagem of the whole PV system are designed. Topologies of main circuit and control circuits are designed, calculation and chosen relative parameters are provided. The corresponding software flow chart is shown in the software part. By building model of PV system simulation, the results of simulation and experiment are provided and the waveforms are analysed. Finally, the full work was summarized. At the same time, some insufficiencies in the paper were pointed out and research content on this subject in the future was made predicted.
Key words PV grid-connected power generation; maximum power point tracking(MPPT); inverter
目 录
摘要 I
Abstract III
第1章 绪论 1
1.1 课题研究的背景和意义 1
1.2 光伏发电在国内外的发展及现状 2
1.3 课题研究的主要内容 5
第2章 光伏发电系统的工作原理及拓补结构 6
2.1 光伏发电系统的组成 6
2.2 光伏发电系统的工作原理 7
2.3 光伏发电并网系统的拓扑结构 8
2.4 光伏并网逆变器的要求 9
2.5 并网逆变器的拓扑 10
2.6 本文所研究光伏发电并网系统总体结构 12
2.7 本章小结 13
第3章 光伏发电并网系统控制策略的研究 14
3.1 光伏发电并网系统的控制目标 14
3.2 并网逆变器控制方式分析 15
3.3 光伏发电并网逆变控制方式 15
3.3 基于SPWM的并网逆变器的控制方式 16
3.3.1 SPWM控制原理 16
3.3.2系统控制模型的建立 18
3.3.3 基于PI反馈控制的电流闭环 20
3.4 光伏发电并网系统频率跟踪、相位跟踪研究 21
3.4.1 DDS技术原理 21
3.4.2 NCO的实现 23
3.4.3频率计的研究 23
3.4.4相位检测 25-br..
目前，能源短缺和生态危机等问题已经引起了世界各国的广泛关注，人类正在不断寻求新的替代能源。其中，太阳能是大量应用的主要常规替代能源之一，而光伏发电并网技术是太阳能利用的主要发展趋势，必将得到飞速的发展。本文就对光伏发电并网系统进行了详细的介绍，并对系统控制算法、系统仿真、软硬件设计等方面进行了深入的探索。
本文首先对光伏发电系统的结构以及工作原理进行了详细的介绍，根据并网逆变器的要求，确定适合本文的并网逆变系统的拓扑结构。
其次对系统的控制策略进行了深入的研究。基于光伏逆变系统的控制目标，分析了常用逆变器控制方式，并选择了SPWM控制方式作为本系统控制方式。对DDS原理进行了分析，采用等精度测频方法进行频率检测和基于等精度测频方法的相位检测。
本文还对光伏电池的工作原理进行了分析，得到光伏电池的等效电路和输出特性。通过对常用的最大功率点跟踪控制（MPPT）算法的分析和比较，提出了采用逐次逼近型算法来实现本系统的最大功率点跟踪，以提高系统的稳定性和快速性。最后应用DDS技术实现并网系统的频率、相位跟踪和最大功率电跟踪。
最后基于TMS320F2812高速数字信号处理器，对该光伏系统的软硬件部分分别进行了设计。硬件部分的工作中，本文详细设计了系统主电路和控制电路的结构、对参数计算进行了说明，完成了主电路硬件的设计。软件部分则给出了系统的软件流程图。本文对光伏系统进行了仿真建模，并对仿真结果进行了分析。同时对系统的SPWM控制方式进行实验，给出了实验结果。最后对本论文的工作进行了总结，指出该系统存在的不足，对以后的研究工作进行了展望。
关键词 光伏并网发电；最大功率点跟踪；逆变器
Abstract
The problems of energy resource crisis and circumstance pollution have been received extensive attention around world, and human should find new replace resource. Solar energy is one of the main replace resources of conventional resources which used widely. Photovoltaic(PV) generate electricity grid-connected technology will be the main utilization of solar energy, so it will be developed rapidly. Based on it, residential PV grid-connected system(PGCS) is introduced in detail and its control algorithm, simulation, hardware and software designs are researched deeply.
Firstly, the structure and operational principle of PV grid-connected generate system are introduced in detail. Based on the requirement of PV grid-connected inverter, the best topology of PV grid-connected system is chose. DDS principle is analyzed, using equal precision measuring frequency method for frequency detection, and based on the equal precision measuring frequency methods for phase detection.
Secondly, the control strategies of the grid-connected PV system are researched deeply. Based on PV system control targets, the common grid control methods are analysed, and SPWM control as control method of PV grid inverter is determined. The principle of DDS is analysed. At the same time, soft PLL is introduced in detail. The structure of Phase locked loop circuit and operating principle are researched. The tracks of frequency and phase are achieved by using DDS technology.
Moreover, based on the operational principle of PV cells is analysed, the equivalent circuit and performance characteristic are obtained. By comparising several traditional Maximum Power Power Point Tracking (MPPT) control algorithms, gradual approximation control algorithm is designed to achieve PV system of the maximum power output and improve system performance and maximum power point tracking speed. Finally using DDS technoloy to realize frequency tracking, phase tracking and MPPT of grid system
At last, based on TMS320F2182 high-speed digital signal processors, hardware configuration and control stratagem of the whole PV system are designed. Topologies of main circuit and control circuits are designed, calculation and chosen relative parameters are provided. The corresponding software flow chart is shown in the software part. By building model of PV system simulation, the results of simulation and experiment are provided and the waveforms are analysed. Finally, the full work was summarized. At the same time, some insufficiencies in the paper were pointed out and research content on this subject in the future was made predicted.
Key words PV grid-connected power generation; maximum power point tracking(MPPT); inverter
目 录
摘要 I
Abstract III
第1章 绪论 1
1.1 课题研究的背景和意义 1
1.2 光伏发电在国内外的发展及现状 2
1.3 课题研究的主要内容 5
第2章 光伏发电系统的工作原理及拓补结构 6
2.1 光伏发电系统的组成 6
2.2 光伏发电系统的工作原理 7
2.3 光伏发电并网系统的拓扑结构 8
2.4 光伏并网逆变器的要求 9
2.5 并网逆变器的拓扑 10
2.6 本文所研究光伏发电并网系统总体结构 12
2.7 本章小结 13
第3章 光伏发电并网系统控制策略的研究 14
3.1 光伏发电并网系统的控制目标 14
3.2 并网逆变器控制方式分析 15
3.3 光伏发电并网逆变控制方式 15
3.3 基于SPWM的并网逆变器的控制方式 16
3.3.1 SPWM控制原理 16
3.3.2系统控制模型的建立 18
3.3.3 基于PI反馈控制的电流闭环 20
3.4 光伏发电并网系统频率跟踪、相位跟踪研究 21
3.4.1 DDS技术原理 21
3.4.2 NCO的实现 23
3.4.3频率计的研究 23
3.4.4相位检测 25-br..
