含多种分布式电源的微电网并网电能质量控制技术研究

发布时间：2018-05-14 02:14

本文选题：分布式电源 + 微电网　；参考：《上海应用技术学院》2015年硕士论文

【摘要】：随着分布式发电、微电网技术的不断发展,微电网系统的结构和电力负载将日益复杂,谐波、电压波动与闪变等电能质量问题的发生概率越来越高。微电网并网后将会严重影响配电网的电能环境。对此,在国家自然科学基金面上项目(项目编号：61374132)资助下,对该问题展开了研究,根据国际柔性输电的发展规律,提出了一种基于有源电力滤波器(APF)和静止型无功补偿发生器(STATCOM)的电能质量控制方法。完成的主要研究内容和成果如下：1.研究了微电网中的常用分布式电源(DG)并网问题,并针对风力发电、光伏发电、燃料电池等目前的主要的DG的原理进、特点进行分析,并搭建各DG的数学模型,研究其并网对配电网电能质量的影响。2.基于瞬时无功理论分析了微电网谐波的快速检测方法,在此基础上针对目前谐波检测算法通常存在的延时问题,研究了一种超前校正方法,经仿真验证本文的超前校正是正确、可行的。3.深入研究了微电网的无功补偿原理,并推导了无功电流检测算法的数学模型。4.考虑到谐波抑制及无功补差指令信号的跟踪控制,对比分析了定频滞环电流控制、三相SPWM调制、SVPWM调制三种常用的调制策略,并针对APF与STATCOM的控制特点,提出一种将电流滞环与空间矢量相结合的调制策略,不仅简化了微电网电能质量优化设备的设计难度,而且有效地提高了微电网并网的电能质量。5.通过PSCAD仿真与样机实验,仿真与实验结果证明了微电网并网电能质量控制理论的正确性与可行性。
[Abstract]:With the development of distributed generation and microgrid technology, the structure and load of microgrid system will become more and more complex, and the probability of power quality problems such as harmonic, voltage fluctuation and flicker will be higher and higher. The power environment of the distribution network will be seriously affected after the microgrid is connected to the grid. In this regard, funded by the National Natural Science Foundation of China (project No.: 61374132), the problem is studied, and according to the law of the development of international flexible transmission, A power quality control method based on active power filter (APF) and static reactive power compensation generator (STATCOM) is proposed. The main contents and results of the research are as follows: 1. In this paper, the problem of DGG grid-connected in microgrid is studied, and the principle and characteristics of DG, such as wind power generation, photovoltaic power generation and fuel cell, are analyzed, and the mathematical models of each DG are built. The influence of the power quality of distribution network is studied. 2. 2. Based on instantaneous reactive power theory, this paper analyzes the fast detection method of harmonic in microgrid, and then, aiming at the delay problem of current harmonic detection algorithm, a method of leading correction is studied, which is proved to be correct by simulation. Feasible. The principle of reactive power compensation in microgrid is deeply studied, and the mathematical model of reactive current detection algorithm is derived. Considering harmonic suppression and tracking control of reactive power compensation command signal, three common modulation strategies are compared and analyzed, such as constant frequency hysteresis current control, three-phase SPWM modulation and SVPWM modulation, and the control characteristics of APF and STATCOM are analyzed. A modulation strategy combining hysteresis of current with space vector is proposed, which not only simplifies the design difficulty of power quality optimization equipment in microgrid, but also effectively improves the power quality of microgrid. Through PSCAD simulation and prototype experiment, the simulation and experiment results prove the correctness and feasibility of the theory of power quality control.
【学位授予单位】：上海应用技术学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM761

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