柔性直流配电网的若干问题研究

发布时间：2018-02-26 02:16

本文关键词： 柔性直流配电网工作原理建模仿真经济性换流器配置　出处：《浙江大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着用电需求与电能质量要求的不断提高,以及新能源、新材料和电力电子技术的长足发展和广泛应用,传统交流配电网将面临分布式能源接入、负荷多样化,以及一次系统结构庞杂、负荷调度及潮流均衡协调控制复杂化等一系列问题。而国外研究资料表明,相比于交流配电网,基于柔性直流技术的配电网在提升电能输送容量、增加系统可控性以及提高供电质量等方面具有更加优越的性能,而且还能很好地协调分布式电源与电网之间的矛盾,充分挖掘分布式能源的效益和价值。因此,兼具稳定性、经济性、可靠性和安全性的柔性直流配电网具有巨大的经济价值和市场潜力。本文针对柔性直流配电网的若干重要问题进行了研究与探讨。首先,整理和论述了直流配电网的相关特点、优势、拓扑结构以及网络的整体概念,总结了当前直流配电网在调度控制、规划设计以及关键设备保护等方面的研究情况；然后,对直流配电网的基本结构、工作原理、协调控制与综合调度策略进行阐述,分析了在直流配电网中可再生能源可能造成的影响,利用PSCAD/EMTDC电力系统分析平台建立直流配电网模型并进行仿真；接着,对交、直流配电网的最大传输容量、主要设备造价与传输效率等进行了计算与分析,对于尚未实现商业化应用的装置,根据其研发费用对未来的市场价格进行了估算,并由此对交、直流配电网进行经济性分析与比较；然后,提出了一种基于遗传算法的交流电源接口换流器配置方法,对交流配电网改建为直流配电网时的换流器接入节点进行选择,即在保证换流器接入后网络能够正常运行的前提下,使线路发生N-1故障时的总电压不合格率最小；最后,对柔性直流配电网的研究情况进行总结,指出直流配电网故障诊断与定位等尚需深入研究的问题。
[Abstract]:With the continuous improvement of the demand for electricity and power quality, and the rapid development and wide application of new energy, new materials and power electronics technology, the traditional AC distribution network will face distributed energy access and diversified load. And a series of problems such as complicated primary system structure, complex load dispatching and coordinated control of power flow equalization, etc. The foreign research data show that compared with AC distribution network, the distribution network based on flexible DC technology is increasing the power transmission capacity. Increasing the controllability of the system and improving the quality of power supply have more superior performance, and can also well coordinate the contradiction between distributed generation and power grid, fully exploit the benefit and value of distributed energy. Flexible DC distribution network with economy, reliability and security has great economic value and market potential. In this paper, some important problems of flexible DC distribution network are studied and discussed. Firstly, the characteristics, advantages, topological structure and the whole concept of DC distribution network are arranged and discussed. This paper summarizes the current research situation of DC distribution network in the aspects of dispatching control, planning and design, and the protection of key equipment. Then, the basic structure, working principle, coordinated control and comprehensive dispatching strategy of DC distribution network are expounded. The influence of renewable energy in DC distribution network is analyzed. The model of DC distribution network is established and simulated by using PSCAD/EMTDC power system analysis platform. Then, the maximum transmission capacity of AC and DC distribution network is analyzed. The cost and transmission efficiency of the main equipment are calculated and analyzed. The future market price is estimated according to the R & D cost of the device which has not yet been commercialized. The economy of DC distribution network is analyzed and compared. Then, an AC power interface converter configuration method based on genetic algorithm is proposed to select the converter access node when AC distribution network is reconstructed into DC distribution network. That is, on the premise of guaranteeing the normal operation of the network after the converter is connected, the total voltage failure rate of N-1 fault line is minimized. Finally, the research situation of flexible DC distribution network is summarized. The problems of fault diagnosis and location in DC distribution network are pointed out.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM721.1

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