【摘要】：隨著現(xiàn)代電力的不斷發(fā)展,環(huán)境污染狀況日益加劇,可再生能源逐漸成為各國(guó)能源發(fā)展的主要目標(biāo)。微電網(wǎng)和柔性直流電網(wǎng)作為接納分布式可再生能源和大規(guī)模集中式可再生能源的有效手段,逐漸成為研究的熱點(diǎn)。微電網(wǎng)需要大量的可控的電力電子裝置進(jìn)行變流處理,同時(shí)柔性直流電網(wǎng)中模塊化多電平換流器也含有數(shù)量眾多的子模塊。這導(dǎo)致在對(duì)微電網(wǎng)和柔性直流電網(wǎng)進(jìn)行詳細(xì)模型仿真時(shí),內(nèi)存需求大,仿真速度慢,仿真時(shí)間長(zhǎng)。針對(duì)含有大規(guī)模電力電子裝置的微電網(wǎng)和模塊化多電平換流器的柔性直流輸電系統(tǒng),論文深入開(kāi)展了平均值建模方法的有效性評(píng)估和應(yīng)用研究,主要工作如下:(1)系統(tǒng)分析了平均值建模理論。首先分析了平均值建模方法的基本原理,在此基礎(chǔ)上,對(duì)平均值建模的兩種方法——狀態(tài)空間平均法和開(kāi)關(guān)周期平均法進(jìn)行了詳細(xì)的理論推導(dǎo),為微電網(wǎng)和柔性直流輸電系統(tǒng)平均值模型的建立奠定了基礎(chǔ)。(2)研究了含典型電力電子裝置的微電網(wǎng)快速仿真。首先,根據(jù)平均值建模方法,建立了微網(wǎng)中典型電力電子裝置(DC/DC、DC/AC、AC/DC變換器)的平均值模型,并驗(yàn)證了它們的有效性;其次,建立了微電網(wǎng)中兩種典型分布式電源——光伏發(fā)電和微型燃汽輪機(jī)的模型;再次,將平均值建模方法應(yīng)用于微電網(wǎng)的快速仿真,建立了含典型電力電子裝置的微電網(wǎng)的平均值模型;最后,在MATLAB中搭建了微電網(wǎng)的詳細(xì)模型和平均值模型,通過(guò)對(duì)比仿真結(jié)果,驗(yàn)證了平均值建模方法的精度和快速性。(3)研究了基于模塊化多電平換流器柔性直流輸電系統(tǒng)的快速仿真。首先,分析了MMC詳細(xì)模型的工作原理、調(diào)制方式,以及MMC子模塊的拓?fù)浣Y(jié)構(gòu)和工作方式;其次,根據(jù)平均值建模方法,建立了 MMC的平均值模型和基于MMC的柔性直流輸電系統(tǒng)的平均值模型,最后,在PSCAD中搭建了 41電平MMC柔性直流輸電系統(tǒng)的詳細(xì)模型與平均值模型,通過(guò)對(duì)比分析在穩(wěn)態(tài)運(yùn)行和暫態(tài)故障下平均值模型和詳細(xì)模型的仿真結(jié)果,驗(yàn)證了 MMC平均值模型在仿真精度和計(jì)算效率方面的有效性。論文的研究結(jié)果表明,平均值模型能夠在合理的精度范圍內(nèi)正確反映被建模對(duì)象的外部特征,而且大大提高了仿真速度。這對(duì)于通過(guò)電磁暫態(tài)仿真進(jìn)一步研究含有大規(guī)模電力電子裝置的微電網(wǎng)和柔性直流電網(wǎng)的運(yùn)行特性和協(xié)調(diào)控制策略,具有重要的理論意義和應(yīng)用價(jià)值。
[Abstract]:With the continuous development of modern electric power, environmental pollution is becoming more and more serious. Renewable energy has gradually become the main goal of energy development in various countries. Microgrid and flexible DC network, as an effective means to accept distributed renewable energy and large-scale centralized renewable energy, have gradually become the focus of research. The microgrid needs a large number of controllable power electronic devices to process the converter, and the modularized multilevel converter also contains a large number of sub-modules in the flexible DC network. This results in a large memory requirement, slow simulation speed and long simulation time in the detailed simulation of microgrid and flexible DC network. Aiming at the flexible direct current transmission systems with large-scale power electronic devices and modularized multilevel converters, the effectiveness evaluation and application research of the average modeling method are carried out in this paper. The main work is as follows: (1) the mean value modeling theory is analyzed systematically. Firstly, the basic principle of the mean value modeling method is analyzed. On the basis of this, two methods of mean value modeling, state space average method and switching cycle average method, are derived in detail. It lays a foundation for the establishment of average value model of microgrid and flexible direct current transmission system. (2) Fast simulation of microgrid with typical power electronic devices is studied. Firstly, according to the average value modeling method, the average value model of typical power electronic devices (DC/DC,DC/AC,AC/DC) in microgrid is established, and their validity is verified. Secondly, the models of two typical distributed generators in microgrid, photovoltaic generation and micro turbine, are established. Thirdly, the average value modeling method is applied to the rapid simulation of microgrid, and the average value model of microgrid with typical power electronic devices is established. Finally, the detailed model and average model of microgrid are built in MATLAB, and the simulation results are compared. The accuracy and rapidity of the mean value modeling method are verified. (3) the fast simulation of flexible HVDC transmission system based on modularized multilevel converter is studied. Firstly, the working principle, modulation mode, topological structure and working mode of MMC submodule are analyzed. Secondly, according to the average value modeling method, the average value model of MMC and the average value model of flexible direct current transmission system based on MMC are established. Finally, the detailed model and average model of 41 level MMC flexible direct current transmission system are built in PSCAD. The simulation results of average value model and detailed model under steady-state operation and transient fault are compared to verify the effectiveness of MMC average model in simulation accuracy and computational efficiency. The research results show that the mean value model can accurately reflect the external characteristics of the modeled object within a reasonable precision range and greatly improve the simulation speed. It is of great theoretical significance and practical value to further study the operation characteristics and coordinated control strategy of microgrid and flexible DC network with large-scale power electronic devices through electromagnetic transient simulation.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM743

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 蔣冠前;李志勇;楊慧霞;楊靜;;柔性直流輸電系統(tǒng)拓?fù)浣Y(jié)構(gòu)研究綜述[J];電力系統(tǒng)保護(hù)與控制;2015年15期

2 許建中;李承昱;熊巖;姬煜軻;趙成勇;安婷;;模塊化多電平換流器高效建模方法研究綜述[J];中國(guó)電機(jī)工程學(xué)報(bào);2015年13期

3 許建中;趙成勇;Aniruddha M.Gole;;模塊化多電平換流器戴維南等效整體建模方法[J];中國(guó)電機(jī)工程學(xué)報(bào);2015年08期

4 楊柳;黎小林;許樹(shù)楷;李巖;劉濤;趙曉斌;陳名;;南澳多端柔性直流輸電示范工程系統(tǒng)集成設(shè)計(jì)方案[J];南方電網(wǎng)技術(shù);2015年01期

5 李巖;羅雨;許樹(shù)楷;周月賓;袁志昌;;柔性直流輸電技術(shù):應(yīng)用、進(jìn)步與期望[J];南方電網(wǎng)技術(shù);2015年01期

6 李扶中;周敏;賀艷芝;郭金川;王宏斌;;南澳多端柔性直流輸電示范工程系統(tǒng)接入與換流站設(shè)計(jì)方案[J];南方電網(wǎng)技術(shù);2015年01期

7 馮滿盈;李巖;許樹(shù)楷;饒宏;黎小林;朱U，

本文編號(hào)：2374669