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储能系统在微网电能质量整治中的应用研究

发布时间:2018-05-16 22:21  文章来源:笔耕文化传播

  本文选题:微电网 + 电能质量 ; 参考:《华南理工大学》2015年硕士论文


【摘要】:作为分布式可再生能源规模化、高效利用的实现形式和智能电网建设的重要组成部分,微电网正日益成为研究关注的热点。然而,微电网中分布式电源因其固有的随机性、间歇性和不稳定性,会对微电网电能质量产生负面影响,特别是孤网运行时影响尤为明显。因此,如何有效地对微电网电能质量进行治理,成为提高微电网可靠、安全运行性能以及推动微电网技术应用发展的关键。利用储能装置提供快速功率缓冲,可以稳定、平滑电网电压和频率波动,很好地解决由分布式电源及微电网自身运行特点产生的电压骤降、电压跌落等电能质量问题。本文以中科院重要方向性项目—东澳海岛微网示范电站为依托,利用MATLAB/SIMULINK仿真软件搭建了典型海岛微网系统模型,研究分析了电池储能系统对微网电能质量的整治效果,并通过示范工程验证了研究结论的正确性。具体研究内容如下:1、探讨了分布式电源、蓄电池的建模及其控制策略。2、分析蓄电池储能系统的接入以及控制方式。根据微网中分布式电源容量与发电特性、负荷要求,从功率需求的角度,提出了蓄电池容量的设计方法。为避免蓄电池过充电和过放电,提高电池的循环使用效率和寿命,提出了一种蓄电池剩余容量估算方法。针对不同的电池类型、不同的电池容量以及不同串并联方式,对蓄电池储能系统进行建模仿真,对比分析了各种电池配置下的蓄电池储能系统的功率交换能力。3、对不含储能系统的海岛微网系统进行了仿真,研究在风速和光照资源波动以及光伏系统启停的工况下,对微网电能质量的影响情况。根据风光资源随机变化、光伏系统启停以及大功率感性负荷启停三种工况进行系统仿真,研究分析了蓄电池储能系统对微电网电能质量的影响及整治效果。研究结论表明,蓄电池储能系统可对分布式电源引起的电压与频率波动、三相电压不平衡、母线电压总谐波畸变率等电能质量问题,起到显著的改善作用,并且对由大功率感性负荷启停造成的电压波动也有很好的治理作用。最后,通过东澳海岛微网示范电站运行测试数据分析,验证了本文的研究结论。
[Abstract]:As a large scale of distributed renewable energy and an important part of smart grid construction, microgrid is becoming a hot research topic. However, because of its inherent randomness, intermittency and instability, distributed generation in microgrid will have a negative impact on the power quality of microgrid, especially in the operation of isolated grid. Therefore, how to effectively control the power quality of microgrid becomes the key to improve the reliability, safe operation performance and promote the development of microgrid technology. Using the energy storage device to provide fast power buffering can stabilize and smooth the voltage and frequency fluctuation of the power network and solve the power quality problems such as voltage drop and voltage drop caused by the characteristics of distributed power generation and microgrid itself. In this paper, based on the important directional project of the Chinese Academy of Sciences-Dongao Island Microgrid demonstration Power Station, the typical island microgrid system model is built by using MATLAB/SIMULINK simulation software, and the regulation effect of battery energy storage system on the micro-grid power quality is studied and analyzed. The correctness of the conclusion is verified by demonstration project. The specific research contents are as follows: 1. The distributed power supply, battery modeling and control strategy are discussed, and the access and control methods of battery energy storage system are analyzed. According to the characteristics of distributed power generation and load in microgrid, the design method of storage battery capacity is put forward from the point of view of power demand. In order to avoid overcharging and overdischarge of batteries and to improve the cycle efficiency and life of batteries, a method for estimating the residual capacity of batteries is proposed. According to different battery types, different battery capacity and different series-parallel modes, the battery energy storage system is modeled and simulated. The power exchange capability of battery energy storage system under various battery configurations is analyzed. The island microgrid system without energy storage system is simulated. The wind speed and light resource fluctuation and the start-up and shutdown of photovoltaic system are studied. The influence on the power quality of microgrid. According to the random variation of solar energy resources, the start-up and shutdown of photovoltaic system and the starting and stopping of high power load, the effects of battery energy storage system on the power quality of microgrid and the improvement effect are studied and analyzed. The research results show that the battery energy storage system can significantly improve the power quality problems such as voltage and frequency fluctuation caused by distributed power supply, three-phase voltage imbalance, total harmonic distortion rate of bus voltage, etc. And the voltage fluctuation caused by the high power inductive load start-stop also has the very good treatment function. Finally, the conclusion of this paper is verified by analyzing the test data of Dongao island microgrid demonstration power station.
【学位授予单位】:华南理工大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:TM912

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