微电网仿真平台的搭建与运行保护研究

发布时间：2018-04-18 12:45

本文选题：微电网 + 微电源　；参考：《安徽工业大学》2017年硕士论文

【摘要】：面临着传统能源的耗尽,新型能源逐渐进入人们的生活。对于21世纪的中国来说,能源的正确合理使用就会显得尤为重要。风能与光伏作为强有力的清洁性能源并以独特的运行方式得到了快速的发展和利用。微电网通过整合微电源与配电网可以方便的进行结构和配置的优化。本文通过对微电网数学模型及不同的运行控制和保护策略进行了详细的分析,紧接着搭建了相应的仿真模型对其进行了验证。首先,分析了微电源的数学模型及控制策略,本文涉及的微电源有恒速恒频风力发电机、蓄电池逆变电源、光伏发电电源,并对逆变型微源的PQ和VF控制进行了详细地分析与研究。其次,利用PSCAD/EMTDC软件搭建了风力发电、蓄电池逆变电源以及简化的光伏发电的仿真模型,其仿真结果表明各个微电源仿真模型的正确性。然后根据微电网的结构设计原则,在前述微电源模型的基础上搭建起交流微电网仿真平台,通过对微电网并网、孤岛及并离网转换等不同运行方式的仿真,分析了系统的动态性能,验证了微源控制策略的有效性与正确性。为了进行保护策略的研究,对微电源及微电网并网和孤岛运行的故障特性进行了理论分析和仿真研究,采用了基于电流相位差动保护原理的双电源供电的线路保护、过流保护的负荷保护以及电压偏移的电源保护相结合的综合保护作为保护策略。
[Abstract]:Facing the depletion of traditional energy, new energy gradually enters people's life.For China in the 21 st century, the correct and rational use of energy will be particularly important.As a powerful clean energy, wind energy and photovoltaic have been developed and utilized rapidly.The structure and configuration of microgrid can be optimized conveniently by integrating micro power supply with distribution network.In this paper, the mathematical model of microgrid and different operation control and protection strategies are analyzed in detail, and then the corresponding simulation model is built to verify it.Firstly, the mathematical model and control strategy of micro power supply are analyzed. The micro power supply in this paper includes constant speed constant frequency wind turbine, battery inverter, photovoltaic power.The PQ and VF control of inverter microsource are analyzed and studied in detail.Secondly, the simulation models of wind power generation, battery inverter and simplified photovoltaic power generation are built by using PSCAD/EMTDC software. The simulation results show that the simulation models of each micro-power source are correct.Then according to the principle of microgrid structure design, the AC microgrid simulation platform is built on the basis of the micro-power model mentioned above, and the simulation of different operation modes such as grid-connected, isolated island and off-grid conversion is carried out.The dynamic performance of the system is analyzed and the validity and correctness of the microsource control strategy are verified.In order to study the protection strategy, the fault characteristics of micropower supply, microgrid grid-connected and isolated island operation are theoretically analyzed and simulated. The dual-power line protection based on current phase differential protection is adopted.The load protection of overcurrent protection and the integrated protection of voltage offset power protection are used as protection strategies.
【学位授予单位】：安徽工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM727

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