直流电网物理仿真系统设计与分析

发布时间：2018-02-17 07:53

本文关键词： 直流电网柔性直流输电拓扑参数设计控制策略物理仿真系统　出处：《华北电力大学》2014年硕士论文　论文类型：学位论文

【摘要】：针对环境问题及能源问题的突出,我国把发展能源资源和环境保护技术放在优先位置,大力优化电源结构和布局。分布式电源具有高效、节能、环保等特点,已成为当今国际上改善能源结构、提高能源效率的重要方向。而多数分布式电源都具有直流环节,与传统交流电网相比,直流电网更适合分布式电源的接入。并且直流电网具有系统稳定性强、电能质量好、无相位及无功问题、损耗小、传送效率高等优势,使得直流电网技术成为研究热点。我国关于直流电网技术的研究仍处于初级阶段,研究方法主要是理论研究与仿真分析,而物理实验能很好的揭示直流电网的动态行为,并能准确的验证理论研究。本文基于实验室电压等级下直流电网物理仿真系统,对直流电网拓扑结构进行研究,提出直流电网通用网格型拓扑,使得直流电网仿真系统更具拓展性与灵活性。设计直流电网仿真系统主回路,提出依据等容量比原则的参数设计方法,并应用此方法设计主回路参数。设计直流电网仿真系统控制策略,包括VSC、双向DC/DC等单个端子的控制策略,及多个端子间的协调控制策略,提出一种基于电压裕度控制的主从控制方法,并根据实验室电压等级计算电压裕度的取值。提出了有一定代表性的适于实验室物理模拟仿真研究的直流电网物理仿真系统,对物理仿真系统进行设计,并通过建立物理模拟系统的数字模型,分析模拟系统的运行特性。在PSCAD下建立含有不同端子数量的直流电网仿真系统模型。分别针对直流电网物理模拟系统的运行特性、运行方案以及采用不同结构的拓扑等方面的进行了仿真分析。为进一步的实验室直流电网物理仿真平台建设实施打下基础。
[Abstract]:In view of the outstanding environmental and energy problems, our country gives priority to the development of energy resources and environmental protection technologies, and vigorously optimizes the structure and layout of power supply. Distributed power generation has the characteristics of high efficiency, energy saving, environmental protection, etc. Nowadays, it has become an important direction to improve energy structure and energy efficiency in the world. The DC network is more suitable for the access of distributed generation, and the DC network has the advantages of strong system stability, good power quality, no phase and reactive power problems, low loss, high transmission efficiency, etc. The research on DC network technology in our country is still in the primary stage, the research methods are mainly theoretical research and simulation analysis, and the physical experiment can reveal the dynamic behavior of DC network very well. And can accurately verify the theoretical research. Based on the physical simulation system of DC network under the voltage level in laboratory, the topology structure of DC network is studied in this paper, and the grid topology for DC network communication is proposed. The main circuit of DC network simulation system is designed, and the parameter design method based on the principle of equal capacity ratio is put forward. The main loop parameters are designed by this method, and the control strategy of DC network simulation system is designed, including the control strategy of single terminal, such as VSC, bi-directional DC/DC, and the coordinated control strategy between multiple terminals. A master-slave control method based on voltage margin control is proposed, and the voltage margin is calculated according to the voltage level of the laboratory. This paper presents a representative physical simulation system of DC network, which is suitable for the research of physical simulation in laboratory. The physical simulation system is designed, and the digital model of the physical simulation system is established. This paper analyzes the operation characteristics of the simulation system. The simulation system model of DC network with different number of terminals is established under PSCAD. The operation characteristics of the physical simulation system of DC network are analyzed respectively. The operation scheme and topology of different structures are simulated and analyzed, which lays a foundation for the further construction and implementation of the physical simulation platform for the laboratory DC network.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM721.1

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