含微网的配电系统电压暂降分析与控制

发布时间：2018-02-11 21:13

本文关键词： 微网电能质量电压暂降　出处：《华北电力大学》2015年硕士论文　论文类型：学位论文

【摘要】：我国地大物博,但资源分布极不平衡,负荷分散在东部发达地区,而能源却集中于西部地区。采用特高压、远距离输电将电能输送到负荷中心不失为一种高效而环保的方法,但可再生能源更多是以分布式发电的形式进行开发利用。把不同互补的能源类型组建到一个共同的微电网之中,通过多种能源转换装置实现一次能源到二次能源的转换,可以有效地提高一次能源的利用效率。同时,在微网中加入储能装置,可以更有效更合理地利用能源,平滑功率波动、确保电压和频率稳定及维持发电和负荷的平衡。微网给我们生活带来了诸多方便,但微网中包含大量的电力电子变换装置,它们的使用对微网的电能质量产生了更高的要求和新的影响。微网短时间的电压降低就可能导致电力电子装置的非正常工作,严重时引起微网的解列,用户可能因此承受巨大的经济损失。因此对含微网的配电系统电压暂降问题进行研究,从而提高微网及配网的电能质量水平,具有重要的意义。本文研究了微网的结构、关键技术及主要微源和控制策略,在PSCAD软件平台上搭建了含微网的配电系统的仿真模型,在仿真平台上对含微网的配电系统电压暂降问题进行机理分析,深入研究了微源与微网、微网与配网相互之间作用对电能质量的影响。根据微网及微电源的特点,本文提出了一种适用于含微网的配电系统的动态电压补偿器,将光伏发电单元和蓄电池协调控制,为动态电压补偿器提供能源输入。最后通过仿真验证了上述动态电压补偿器对电压暂降的补偿效果。结果表明,以上动态电压恢复器适用于含微网的配电系统,在充分利用微源的情况下能够保证微网正常运行,提高了含微网的配电系统的电能质量水平。
[Abstract]:Our country is rich in resources, but the distribution of resources is very unbalanced, the load is scattered in the eastern developed area, but the energy is concentrated in the western region. It is an efficient and environmentally friendly method to transmit electric energy to the load center by using UHV and long-distance transmission. However, renewable energy is more developed and utilized in the form of distributed power generation. Different complementary energy types are formed into a common microgrid, and primary to secondary energy are converted through a variety of energy conversion devices. It can effectively improve the efficiency of primary energy utilization. At the same time, by adding energy storage device to the microgrid, energy can be used more effectively and reasonably, and the power fluctuation can be smoothed. Ensure voltage and frequency stability and maintain power generation and load balance. Microgrids bring us a lot of convenience in our lives, but microgrids contain a large number of power electronic conversion devices. Their use has higher requirements and new effects on the power quality of microgrids. A short period of voltage reduction in microgrids may lead to abnormal operation of power electronic devices and, in serious cases, to the de-listing of microgrids. Therefore, it is of great significance to study the voltage sag of distribution system with microgrid in order to improve the power quality level of microgrid and distribution network. Based on the key technology and main microsource and control strategy, the simulation model of distribution system with microgrid is built on PSCAD software platform, and the mechanism of voltage sag of distribution system with microgrid is analyzed on the simulation platform. The effect of the interaction between microsource and microgrid, micro-grid and distribution network on power quality is deeply studied. According to the characteristics of micro-grid and micro-power supply, a dynamic voltage compensator suitable for distribution system with microgrid is proposed in this paper. The photovoltaic unit and battery are coordinated to provide the energy input for the dynamic voltage compensator. Finally, the effect of the dynamic voltage compensator on voltage sag is verified by simulation. The above dynamic voltage restorer is suitable for the distribution system with microgrid. It can ensure the normal operation of the microgrid and improve the power quality level of the distribution system with microgrid under the condition of making full use of the microsource.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM714.2

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