本文關鍵詞： 直流電網(wǎng) 柔性直流輸電 拓撲 參數(shù)設計 控制策略 物理仿真系統(tǒng)　出處：《華北電力大學》2014年碩士論文　論文類型：學位論文

【摘要】：針對環(huán)境問題及能源問題的突出,我國把發(fā)展能源資源和環(huán)境保護技術放在優(yōu)先位置,大力優(yōu)化電源結構和布局。分布式電源具有高效、節(jié)能、環(huán)保等特點,已成為當今國際上改善能源結構、提高能源效率的重要方向。而多數(shù)分布式電源都具有直流環(huán)節(jié),與傳統(tǒng)交流電網(wǎng)相比,直流電網(wǎng)更適合分布式電源的接入。并且直流電網(wǎng)具有系統(tǒng)穩(wěn)定性強、電能質量好、無相位及無功問題、損耗小、傳送效率高等優(yōu)勢,使得直流電網(wǎng)技術成為研究熱點。我國關于直流電網(wǎng)技術的研究仍處于初級階段,研究方法主要是理論研究與仿真分析,而物理實驗能很好的揭示直流電網(wǎng)的動態(tài)行為,并能準確的驗證理論研究。 本文基于實驗室電壓等級下直流電網(wǎng)物理仿真系統(tǒng),對直流電網(wǎng)拓撲結構進行研究,提出直流電網(wǎng)通用網(wǎng)格型拓撲,使得直流電網(wǎng)仿真系統(tǒng)更具拓展性與靈活性。設計直流電網(wǎng)仿真系統(tǒng)主回路,提出依據(jù)等容量比原則的參數(shù)設計方法,并應用此方法設計主回路參數(shù)。設計直流電網(wǎng)仿真系統(tǒng)控制策略,包括VSC、雙向DC/DC等單個端子的控制策略,及多個端子間的協(xié)調控制策略,提出一種基于電壓裕度控制的主從控制方法,并根據(jù)實驗室電壓等級計算電壓裕度的取值。 提出了有一定代表性的適于實驗室物理模擬仿真研究的直流電網(wǎng)物理仿真系統(tǒng),對物理仿真系統(tǒng)進行設計,并通過建立物理模擬系統(tǒng)的數(shù)字模型,分析模擬系統(tǒng)的運行特性。在PSCAD下建立含有不同端子數(shù)量的直流電網(wǎng)仿真系統(tǒng)模型。分別針對直流電網(wǎng)物理模擬系統(tǒng)的運行特性、運行方案以及采用不同結構的拓撲等方面的進行了仿真分析。為進一步的實驗室直流電網(wǎng)物理仿真平臺建設實施打下基礎。
[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.
【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM721.1

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本文編號：1517583