10kW光伏并网逆变控制系统的研究
发布时间：2018-11-28 17:48
【摘要】：近年来,随着能源危机和环境问题的日益突出,开发一种新的能源显得刻不容缓。太阳能逐渐成为许多国家争相研究的重点,当前对太阳能的利用形式很多,其中最前沿也是最有发展前景的是光伏发电。本文主要是关于10kW光伏并网逆变控制系统的研究,着重分析了并网型逆变系统的结构及其控制策略,并利用样机进行了实验分析。 本文首先充分分析了光伏电池的外特性,并对常见的几种MPPT控制策略进行分析比较。提出了基于模型参考电导增量法的MPPT控制策略,提高了跟踪速度及控制精度,更快更稳的对光伏电池的最大功率点进行实时跟踪。其次,对并网发电系统的主电路结构进行了详细设计。前级的DC/DC升压部分采用了一种双Boost升压斩波器,该结构运用了交错并联控制技术,从而大大减小了电流纹波幅值,提高了开关频率；后级的DC/AC逆变部分用到了IPM模块6MBP50RA120,内含三相全桥逆变电路,并采用虚拟磁链定向控制技术进行控制。对并网逆变器的软硬件进行了系统的设计,主要是针对其辅助电源、检测电路和控制电路部分,控制电路中采用了DSP2407对系统进行实时控制；针对光伏发电常见的孤岛效应问题,提出了一种基于正反馈的主动频移反孤岛策略。并对其进行仿真分析,验证了该策略检测速度更快。 最后,依托实验室现有的10kW光伏并网发电系统,通过分析实验波形,验证了本文所提出的控制策略的可行性和有效性。
[Abstract]:In recent years, with the increasingly prominent energy crisis and environmental problems, it is urgent to develop a new energy source. Solar energy has gradually become the focus of research in many countries. At present, there are many forms of solar energy utilization, among which photovoltaic power generation is the most advanced and the most promising. This paper is mainly about the research of 10kW photovoltaic grid-connected inverter control system. The structure and control strategy of grid-connected inverter system are analyzed emphatically, and the experimental analysis is carried out by using the prototype. In this paper, the external characteristics of photovoltaic cells are analyzed, and several common MPPT control strategies are analyzed and compared. The MPPT control strategy based on the model reference conductance increment method is proposed to improve the tracking speed and control accuracy and to track the maximum power point of the photovoltaic cell more quickly and steadily in real time. Secondly, the main circuit structure of grid-connected generation system is designed in detail. A double Boost boost chopper is used in the DC/DC boost part of the front stage. The structure uses the staggered parallel control technology, which greatly reduces the current ripple amplitude and improves the switching frequency. The IPM module 6MBP50RA120 is used in the DC/AC inverter, which contains three-phase full-bridge inverter circuit and is controlled by virtual flux linkage directional control technology. The hardware and software of grid-connected inverter are designed, mainly aiming at its auxiliary power supply, detection circuit and control circuit. In the control circuit, DSP2407 is used to control the system in real time. Aiming at the problem of islanding effect in photovoltaic power generation, an active frequency shift and inverse islanding strategy based on positive feedback is proposed. The simulation results show that the detection speed of the strategy is faster. Finally, the feasibility and effectiveness of the proposed control strategy are verified by analyzing the experimental waveforms based on the existing 10kW photovoltaic grid-connected power generation system in the laboratory.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM921.5
本文编号：2363750
[Abstract]:In recent years, with the increasingly prominent energy crisis and environmental problems, it is urgent to develop a new energy source. Solar energy has gradually become the focus of research in many countries. At present, there are many forms of solar energy utilization, among which photovoltaic power generation is the most advanced and the most promising. This paper is mainly about the research of 10kW photovoltaic grid-connected inverter control system. The structure and control strategy of grid-connected inverter system are analyzed emphatically, and the experimental analysis is carried out by using the prototype. In this paper, the external characteristics of photovoltaic cells are analyzed, and several common MPPT control strategies are analyzed and compared. The MPPT control strategy based on the model reference conductance increment method is proposed to improve the tracking speed and control accuracy and to track the maximum power point of the photovoltaic cell more quickly and steadily in real time. Secondly, the main circuit structure of grid-connected generation system is designed in detail. A double Boost boost chopper is used in the DC/DC boost part of the front stage. The structure uses the staggered parallel control technology, which greatly reduces the current ripple amplitude and improves the switching frequency. The IPM module 6MBP50RA120 is used in the DC/AC inverter, which contains three-phase full-bridge inverter circuit and is controlled by virtual flux linkage directional control technology. The hardware and software of grid-connected inverter are designed, mainly aiming at its auxiliary power supply, detection circuit and control circuit. In the control circuit, DSP2407 is used to control the system in real time. Aiming at the problem of islanding effect in photovoltaic power generation, an active frequency shift and inverse islanding strategy based on positive feedback is proposed. The simulation results show that the detection speed of the strategy is faster. Finally, the feasibility and effectiveness of the proposed control strategy are verified by analyzing the experimental waveforms based on the existing 10kW photovoltaic grid-connected power generation system in the laboratory.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM921.5
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