含储能系统的微电网无缝切换技术应用研究

发布时间：2018-07-04 13:33

本文选题：无缝切换 + 微电网　；参考：《华北电力大学(北京)》2017年硕士论文

【摘要】：微电网的出现,解决了传统电网诸多弊端和新能源接入电网困难的问题,但同时也带来了微电网与大电网之间并网运行以及解列运行的问题,因此微电网的并网模式与孤岛模式之间的切换成为近年来研究的热点。随着新能源项目的增多,各种微电网项目和储能电站项目的开展,从微电网有缝模式切换,再到主动式的无缝切换,以及技术难度较高的被动式无缝切换技术越来越受学者的关注及研究,并且微电网对其并网模式和孤岛模式的切换技术要求也就越来越高,无缝切换技术的实现满足了微电网并网模式和孤岛模式切换的技术要求,解决了微网内敏感负荷的不间断供电、与大电网互补、用户供电可靠性等问题。本文提出了一种利用储能系统的无缝切换技术来实现微电网无缝切换功能的方案。通过研究并改进储能变流器的控制策略、下垂控制技术以及微网内多机运行策略,提出了基于储能变流器的无缝切换控制的微电网控制策略,利用RTDS仿真软件建立微电网仿真模型,依据提出的控制策略对微电网的模式切换进行仿真,验证了控制策略的正确性,仿真通过后,也相继得到现场工程的验证,通过实际工程应用的情况分析,此研究方案的无缝切换成功率高,采用此控制策略的微电网运行稳定可靠,能实现微电网的不间断供电,试验及工程应用均达到了预期的效果,此方案中储能系统的无缝切换控制模式扩展性强,不仅仅应用与微电网模式,同样也可推广到大电网下的储能电站。
[Abstract]:The emergence of microgrid solves the problems of many disadvantages of traditional grid and the difficulty of connecting new energy to grid, but it also brings about the problem of grid connection and unlisting operation between microgrid and large power grid. Therefore, switching between grid-connected mode and islanding mode has become a hot topic in recent years. With the increase of new energy projects, the development of various microgrid projects and energy storage power station projects, from micro-grid slit mode switching to active seamless switching, And passive seamless handoff technology with high technical difficulty has been paid more and more attention and research by scholars, and the switching technology requirements of its grid-connected mode and islanding mode are becoming higher and higher in micro-grid. The realization of seamless switching technology meets the technical requirements of microgrid grid-connected mode and islanding mode, and solves the problems of uninterrupted power supply of sensitive load in microgrid, complementation with large power grid, reliability of user power supply, and so on. This paper presents a scheme to realize seamless switching of microgrid using seamless switching technology of energy storage system. By studying and improving the control strategy of energy storage converter, droop control technology and multi-machine operation strategy in microgrid, the control strategy of micro-grid based on seamless switching control of energy storage converter is proposed. The simulation model of microgrid is established by using RTDS simulation software, and the mode switching of microgrid is simulated according to the proposed control strategy. The correctness of the control strategy is verified. After the simulation, the simulation is verified by the field engineering one after another. Through the analysis of the actual engineering application, it is found that the seamless switching success rate of this research scheme is high, the microgrid with this control strategy is stable and reliable, and the uninterrupted power supply of the microgrid can be realized. Both the experiment and the engineering application have achieved the expected results. In this scheme, the seamless switching control mode of the energy storage system has strong expansibility, which not only applies to the microgrid mode, but also can be extended to the energy storage power station under the large power network.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM727

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