储能逆变器的反孤岛检测研究

发布时间：2018-01-15 01:10

本文关键词：储能逆变器的反孤岛检测研究　出处：《电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：分布式发电具有节省投资、降低能耗、少污染、高可靠性和灵活性等优点。在追求环境友好型和能源可持续发展的今天,分布式发电是对大电网的有力补充,具有着良好的发展趋势。大容量储能逆变器能够满足电网的“削峰填谷”调度要求,作为一种分布式发电系统能够对电能进行有效的利用。然而,随着分布式发电系统的广泛应用,孤岛效应发生的概率也随之增大,孤岛效应引发的严重安全问题不容忽视。本文对储能逆变器系统的反孤岛检测技术进行了深入的研究,本文研究主要内容如下。介绍本文课题的研究背景,指出本文的研究意义并就相关问题对国内外研究现状进行了概述。介绍了三相储能逆变器系统主电路拓扑结构、控制策略和其工作原理;对孤岛的定义、原理以及孤岛检测的重要问题进行了介绍。对常用的孤岛检测方法进行了原理分析与对比介绍,并建立了相应的仿真模型,针对两种主要的反孤岛策略:主动移频(Active frequency drift,AFD)法和滑模频移(Slip Mode Frequency Shift,SMS)法进行了深入讨论、仿真并给出了一定条件下的检测盲区分布图。分析了主动移移频(AFD)法在三相储能逆变器中不能直接应用的原因,结合主动移频(AFD)法和三相储能逆变器的控制特点,提出了一种改进的基于正反馈的同步矢量孤岛检测算法,从理论和仿真上验证了方法的可行性,然后根据无功电流iq和公共点频率f的关系特性,提出了一种基于iq-f特性曲线的参数、方向自适应孤岛检测算法,搭建了储能逆变器反孤岛检测仿真模型。通过Matlab软件和实验平台对提到的主要孤岛检测算法和关键问题进行仿真和现场实验,实验验证了理论分析的正确性同时也表明了所提出的算法具有方向自适应和扰动系数自适应优点。
[Abstract]:Distributed generation has the advantages of saving investment, reducing energy consumption, reducing pollution, high reliability and flexibility. In the pursuit of environmentally friendly and energy sustainable development today, distributed generation is a powerful complement to large power grid. There is a good development trend. Large capacity energy storage inverter can meet the power grid "peak and valley" scheduling requirements, as a distributed generation system can make effective use of electricity. However. With the wide application of distributed generation system, the probability of islanding effect also increases. The serious security problems caused by the islanding effect can not be ignored. The anti-islanding detection technology of the energy storage inverter system is deeply studied in this paper. The main contents of this study are as follows. The research background of this paper is introduced. The research significance of this paper is pointed out, and the current research situation at home and abroad is summarized. The main circuit topology, control strategy and working principle of three-phase energy storage inverter system are introduced. The definition, principle and important problems of islanding detection are introduced. The common methods of islanding detection are analyzed and compared, and the corresponding simulation model is established. There are two main anti-islanding strategies: active frequency drift. The AFDs method and sliding-mode shift Mode Frequency shift method are discussed in detail. The blind area distribution diagram under certain conditions is given, and the reason why the active frequency shift AFD-method can not be directly applied in three-phase energy storage inverter is analyzed. An improved synchronous vector islanding detection algorithm based on positive feedback is proposed based on the active frequency shift AFDs method and the control characteristics of three-phase energy storage inverter. The feasibility of the method is verified theoretically and by simulation. Then according to the relationship between reactive current iq and common frequency f, a directional adaptive islanding detection algorithm based on iq-f characteristic curve is proposed. The anti-islanding detection simulation model of energy storage inverter is built. The main islanding detection algorithms and key problems mentioned above are simulated and tested by Matlab software and experimental platform. The experimental results verify the correctness of the theoretical analysis and show that the proposed algorithm has the advantages of directional adaptation and perturbation coefficient adaptation.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM464

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