發(fā)布時間：2018-02-17 07:53

  本文關(guān)鍵詞： 直流電網(wǎng) 柔性直流輸電 拓?fù)?參數(shù)設(shè)計 控制策略 物理仿真系統(tǒng)　出處：《華北電力大學(xué)》2014年碩士論文　論文類型：學(xué)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(hù)技術(shù)放在優(yōu)先位置,大力優(yōu)化電源結(jié)構(gòu)和布局。分布式電源具有高效、節(jié)能、環(huán)保等特點(diǎn),已成為當(dāng)今國際上改善能源結(jié)構(gòu)、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(qiáng)、電能質(zhì)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(shù)成為研究熱點(diǎn)。我國關(guān)于直流電網(wǎng)技術(shù)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(shí)驗(yàn)?zāi)芎芎玫慕沂局绷麟娋W(wǎng)的動態(tài)行為,并能準(zhǔn)確的驗(yàn)證理論研究。 本文基于實(shí)驗(yàn)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?fù)浣Y(jié)構(gòu)進(jìn)行研究,提出直流電網(wǎng)通用網(wǎng)格型拓?fù)?使得直流電網(wǎng)仿真系統(tǒng)更具拓展性與靈活性。設(shè)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(shè)計方法,并應(yīng)用此方法設(shè)計主回路參數(shù)。設(shè)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(diào)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(shí)驗(yàn)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(shí)驗(yàn)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(jìn)行設(shè)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(yùn)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(yùn)行特性、運(yùn)行方案以及采用不同結(jié)構(gòu)的拓?fù)涞确矫娴倪M(jìn)行了仿真分析。為進(jìn)一步的實(shí)驗(yàn)室直流電網(wǎng)物理仿真平臺建設(shè)實(shí)施打下基礎(chǔ)。
[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(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM721.1

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本文編號：1517583