微电网建模仿真探讨及平台开发
本文关键词：微电网建模仿真研究及平台开发，由笔耕文化传播整理发布。
微电网建模仿真探讨及平台开发
微电网建模仿真探讨及平台开发
微电网是为整合分布式发电的优势,削弱分布式发电对电网的冲击和负面影响而提出的一种新的分布式能源组织方式和结构。它通过整合分布式发电单硕博在线论文网与配电网,在一个局部区域内直接将分布式发电单硕博在线论文网、电力网络和终端用户联系在一起,可以方便地进行结构和配置的优化。结合冷热电联供方案,能够提高能源利用效率,减轻能源动力系统对环境的影响,推动分布式电源上网,推动社会向绿色、环保、节能方向发展。无疑,微电网运行将成为未来大型电网的有力补充和有效支撑,是未来电力系统的发展趋势之一。本文以微电网建模仿真研究及平台开发为主要内容,重点工作主要集中在微电源建模及运行特性浅析浅析、微电网仿真平台开发及运行特性浅析浅析、微电网运行对电网综合负荷模型的影响三个方面。文章首先详细浅析浅析了各微电源的数学模型及其工作特性,利用了Simulink软件构建了简化固体氧化物燃料电池、光伏电池、风力发电机、柴油发电机等微电源的仿真模型。根据各个微电源的不同特性,从不同的侧重点对各微电源进行了仿真浅析浅析。仿真结果表明本文所建立的各个微电源能够反应实际微电源的运行情况,能够适应复杂微电网系统的建模需要。其次,浅析浅析比较了各种微电网制约对策的优劣势,在此基础上根据仿真平台的需要,考虑了微电网在受到扰动后的电压频率支撑不足,选取了V／f制约作为微电网的制约方式,利用Simulink软件建立了基于电压源型逆变器的V／f制约对策的详细制约器模型,然后与已经构建的各微电源模型一起搭建了微电网的仿真平台。考虑了微电网孤网运行时系统功率不平衡不足,设计了一个二级负载来吸收系统中的不平衡功率,以确保系统在孤网运行时能够快速实现功率平衡；利用了三个典型的仿真算例,模拟了微电网的各种运行状态,仿真结果表明：本文所构建的微电网仿真平台能够承受较强的负荷投切冲击,能够抵御较为严重的三相接地短路故障,能够实现由孤网向并网,由并网向孤网的不同运行模式的平滑切换,并且具有较好的电能质量。最后,文章选取了感应电动机+恒阻抗的综合负荷模型对微电网不同运行情况下得到的故障数据进行了辨识浅析浅析。辨识结果表明微电网接入电网后,随着其内部的微电源出力的变化其对电网综合负荷模型的影响有所不同,当微电源出力较大时,传统的综合负荷模型已不能表示其内部的负荷特性,此时需要新的负荷模型来表示其负荷特性。本文能够为微电网研究提供良好的仿真手段。
【Abstract】 Microgrid is a proposed new organization and structure of the distributed energy to integrate the advantages of distributed generation,reduce the impact of distributed generation on the grid and negative impacts.It is through the integration of distributed generation units and the relationgship between the distributed network,directly to make the distributed power generation units,power networks and end users together in a local area.It can optimized the structure,and configuration easily. Combined with CCPH program,it can improve energy efficiency,reduce the impact of energy power systems on the enviroment, promote distributed power line, improve relability and to promote social to develepment to the green,environmental protection,energy saving.Undoubtedly, the microgrid will be the next large grid’s complements and effective support,and the future trend of power system.The main content of this paper is the modeling and simulation of Microgrid and platform development,it focus mainly on three parts:modeling of Micro-power and performance analysis,developing of Microgrid simulation platform and performance analysis,the impact of Microgird operation on the integrated load model.At first, various of micropower mathematical models and its features were analied, a simplified solid oxide fuel cell,photovoltaic cell, wind generation and diesel power generators models were build using Simulink software.According to the different characteristics of each micro-power, do simulation analysis to each micro-power from diferent emphases point, the simulation results show that the Micro-power models can simulate the actual operation very well,they ara able to adaptto complex modeling of Microgrid. Secondly, various control strategies of microgrid were detailed introducted and compared,on the basis of the demand of simulation platform, take into account the requirement of laboratory research projects and the voltage disturbance and frequency support, a voltage/frequence control strategy was choosed, a voltage source inverter with V/f control strategy was built by simulink software.Then a Microgrid simulation platform was built with micropower models and v/f controller model that bulit before.The problem of power imbalances when Microgrid isolated operation was considered,a secondary load to absorb the power imblance in the system was designed cleverly,it can balance the power quikly when the microgrid is isolated opertion. Three typical simulation examples were used to simulite all kinds of operation states of microgrid. It shows that the simulation platform can bear a strong impact on the load switching.It also can bear serious short-circuit fault conditions,and simulate the operation of microgrid from the grid to the island and from the island to the grid smoothly with good power quality.Finally,different kinds of fault data obtained from different Microgrid opertion were identified by induction motor with constant impedance load model.The results show that the Microgrid have different effects on the integrated load model when the output of micro-power changed. When the miro-power output is too large,the traditional integrated load model unable to response its internal load characteristics,and it need new model to reflect its load characteristics.The research in the paper provided a good simulation tool to the research of Microgrid.
【关键词】 微电网； 微电源； V/f制约对策； 并网运行； 孤网运行； 仿真平台；【Key words】 Microgrid； Micro-power； Voltage/frequency control strategy； Grid-C onnected； Isolated operation； Simulation platform；
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本文关键词：微电网建模仿真研究及平台开发，，由笔耕文化传播整理发布。
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