本文關(guān)鍵詞： 交直流電力系統(tǒng) 小擾動(dòng)分析 低頻振蕩 直流功率調(diào)制　出處：《南京理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：高壓直流輸電(HVDC)在遠(yuǎn)距離、大容量輸電中具有明顯優(yōu)勢(shì)。為實(shí)現(xiàn)區(qū)域電網(wǎng)互聯(lián),高壓直流輸電已成為我國(guó)電網(wǎng)的重要組成部分,同時(shí)也使電網(wǎng)結(jié)構(gòu)和運(yùn)行特性更加復(fù)雜,需要有效的方法來(lái)保證系統(tǒng)穩(wěn)定運(yùn)行。在交流輸電的基礎(chǔ)上,利用直流輸電可控性強(qiáng)的特點(diǎn),能夠提高電網(wǎng)運(yùn)行的穩(wěn)定性。直流功率調(diào)制是一種附加的直流系統(tǒng)控制方式,用于拓展直流線路的控制能力。在交流系統(tǒng)受到擾動(dòng)時(shí),它根據(jù)交流系統(tǒng)的狀態(tài)變化來(lái)調(diào)節(jié)直流線路的輸送功率,以增強(qiáng)系統(tǒng)的阻尼,抑制輸電線路的功率振蕩,從而提高互聯(lián)系統(tǒng)的穩(wěn)定性。本文的主要工作如下:(1)分析了兩端直流輸電系統(tǒng)的基本原理、數(shù)學(xué)模型和不同控制方式的運(yùn)行特性,闡述了交直流電力系統(tǒng)潮流計(jì)算和時(shí)域暫態(tài)分析的原理、方法和步驟,采用統(tǒng)一迭代法完成了潮流計(jì)算,本文采用交替求解法進(jìn)行交直流電力系統(tǒng)的暫態(tài)仿真。(2)論述了低頻振蕩的表現(xiàn)形式及其產(chǎn)生機(jī)理,討論了低頻振蕩的分析方法。推導(dǎo)了 Prony法的數(shù)學(xué)模型,完成了參數(shù)的選取,包括采樣頻率、時(shí)間長(zhǎng)度以及模型階次等。通過(guò)算例分析,驗(yàn)證了本文算法及程序的正確性。(3)建立了直流控制系統(tǒng)模型,包括換流器的定電流控制、定功率控制、定電壓控制、定關(guān)斷角控制等基本控制方式。建立了直流功率調(diào)制器模型。用線性化方法分析了直流功率調(diào)制對(duì)電力系統(tǒng)小擾動(dòng)穩(wěn)定性的影響,詳述了小擾動(dòng)穩(wěn)定分析的步驟。(4)以四機(jī)兩區(qū)域系統(tǒng)模型為研究對(duì)象,分析了直流功率調(diào)制對(duì)電力系統(tǒng)暫態(tài)穩(wěn)定性的影響。計(jì)算結(jié)果表明直流功率調(diào)制可以有效地抑制功率振蕩,提高系統(tǒng)的穩(wěn)定性。
[Abstract]:HVDC (HVDC) has obvious advantages in long distance and large capacity transmission. In order to realize the interconnection of regional power grid, HVDC has become an important part of our power network. At the same time, it also makes the power network structure and operation characteristics more complex, need effective methods to ensure the stable operation of the system. On the basis of AC transmission, using the characteristics of high controllability of DC transmission. DC power modulation is a kind of additional DC system control method, which is used to expand the control ability of DC line. When the AC system is disturbed, DC power modulation can improve the stability of the power system. It adjusts the transmission power of DC line according to the state change of AC system, in order to enhance the damping of the system and restrain the power oscillation of transmission line. In order to improve the stability of interconnected systems, the main work of this paper is as follows: 1) the basic principles, mathematical models and operation characteristics of different control modes of HVDC systems are analyzed. The principle, method and procedure of power flow calculation and time-domain transient analysis of AC / DC power system are described. The unified iterative method is used to complete the power flow calculation. In this paper, alternating solution method is used to simulate the transient state of AC / DC power system. This paper discusses the analytical method of low frequency oscillation, deduces the mathematical model of Prony method, and completes the selection of parameters, including sampling frequency, time length and the order of model, etc. The correctness of the algorithm and program is verified. (3) the DC control system model is established, including constant current control, constant power control and constant voltage control of converter. The DC power modulator model is established and the influence of DC power modulation on the small disturbance stability of power system is analyzed by linearization method. The procedure of small disturbance stability analysis is described in detail. (4) the four-machine two-region system model is taken as the research object. The effect of DC power modulation on the transient stability of power system is analyzed. The results show that DC power modulation can effectively suppress the power oscillation and improve the stability of the power system.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM721.1

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