本文選題：微網(wǎng)　切入點(diǎn)：實(shí)時(shí)仿真　出處：《天津大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：微網(wǎng)系統(tǒng)的實(shí)時(shí)仿真是當(dāng)前電力領(lǐng)域的發(fā)展方向,具有十分重要的理論意義與工程應(yīng)用價(jià)值。對(duì)微網(wǎng)系統(tǒng)進(jìn)行實(shí)時(shí)仿真不僅能夠幫助認(rèn)知微網(wǎng)系統(tǒng)中快動(dòng)態(tài)過(guò)程,而且為保護(hù)設(shè)備和控制裝置提供良好的測(cè)試平臺(tái)。圍繞著微網(wǎng)仿真模型并行算法這一主題,本文主要對(duì)微網(wǎng)一次系統(tǒng)的模型建立和求解過(guò)程進(jìn)行了研究。提出了基于節(jié)點(diǎn)分析的暫態(tài)仿真的基本框架,具體包括通過(guò)差分方法將微網(wǎng)一次系統(tǒng)仿真模型轉(zhuǎn)化為諾頓等效形式,并采用基于節(jié)點(diǎn)方程的電氣系統(tǒng)的建模方法將系統(tǒng)轉(zhuǎn)化線性方程組進(jìn)行求解;給出了采用高斯消去法對(duì)線性方程組進(jìn)行直接求解的方法,同時(shí)提出利用系數(shù)矩陣的稀疏性和對(duì)稱性來(lái)提高求解速度;給出了非線性元件求解思路,包括補(bǔ)償法和分段線性化方法。研究了適于微網(wǎng)系統(tǒng)仿真的元件模型與實(shí)現(xiàn)方法,對(duì)于分布式電源如光伏電池模型進(jìn)行了簡(jiǎn)化,建立了方便易解的數(shù)學(xué)模型;對(duì)電力電子變流器采用詳細(xì)模型的拓?fù)浣７?可以采用開(kāi)關(guān)器件模型組合描述任何形式的電力電子裝置;對(duì)于常規(guī)元件包括普通變壓器、線路、普通開(kāi)關(guān)、負(fù)荷以及交流側(cè)供電端也提出了相應(yīng)的建模方法,特別的考慮了變壓器勵(lì)磁支路的磁滯飽和特性。為提高仿真速度,研究了微網(wǎng)系統(tǒng)仿真的并行算法,采用特殊的小步長(zhǎng)模型對(duì)電力電子開(kāi)關(guān)電路進(jìn)行建模以提升仿真效率,對(duì)電氣系統(tǒng)中的其它元件以及控制系統(tǒng)則采用常規(guī)步長(zhǎng)進(jìn)行仿真,二者通過(guò)接口變壓器實(shí)現(xiàn)接口。在此基礎(chǔ)上提出了基于傳輸線分網(wǎng)的并行多速率電磁暫態(tài)仿真算法,使得整個(gè)系統(tǒng)能夠解耦并行求解。最后通過(guò)對(duì)一個(gè)小型低壓光伏微網(wǎng)系統(tǒng)算例的建模與仿真,綜合研究并驗(yàn)證了本文算法的正確性和有效性。
[Abstract]:Real-time simulation of microgrid system is the development direction of power field, which has very important theoretical significance and engineering application value. Real-time simulation of micro-grid system can not only help to recognize the fast dynamic process in micro-grid system. It also provides a good test platform for protection equipment and control device. In this paper, the modeling and solving process of primary microgrid system is studied, and the basic framework of transient simulation based on node analysis is proposed. The first order system simulation model of microgrid is transformed into Norton equivalent form by difference method, and the system is transformed into linear equations by the method of electrical system modeling based on nodal equation. This paper presents a method of directly solving linear equations by using Gao Si elimination method, and proposes to improve the speed of solution by using the sparsity and symmetry of the coefficient matrix, and gives the train of thought of solving nonlinear elements. It includes compensation method and piecewise linearization method. The component model and realization method suitable for microgrid system simulation are studied. The distributed power source such as photovoltaic cell model is simplified and a convenient and easy to solve mathematical model is established. The topology modeling method of detailed model is used for power electronic converter, and the switching device model can be used to describe any kind of power electronic device. The corresponding modeling method for load and AC side power supply terminal is also proposed, especially considering the hysteresis saturation characteristic of transformer excitation branch. In order to improve the simulation speed, the parallel algorithm of microgrid system simulation is studied. The special small step model is used to model the power electronic switch circuit to improve the simulation efficiency, and the conventional step size is used to simulate the other components and control system in the electrical system. On the basis of this, a parallel multi-rate electromagnetic transient simulation algorithm based on transmission line branch network is proposed. The whole system can be decoupled and solved in parallel. Finally, through modeling and simulation of a small low-voltage photovoltaic microgrid system, the correctness and validity of this algorithm are comprehensively studied and verified.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM743

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