本文選題：光伏電站　切入點(diǎn)：地區(qū)電網(wǎng)　出處：《華北電力大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：近年來(lái),為了應(yīng)對(duì)能源和環(huán)境這兩大制約人類社會(huì)發(fā)展的主要問(wèn)題,各國(guó)紛紛開(kāi)始尋求新的解決措施,大規(guī)模的光伏發(fā)電在此背景下應(yīng)運(yùn)而生。然而,大量光伏電站接入傳統(tǒng)電網(wǎng),在增加系統(tǒng)運(yùn)行方式靈活性的同時(shí),也增加了系統(tǒng)結(jié)構(gòu)的復(fù)雜性,給地區(qū)電網(wǎng)的繼電保護(hù)帶來(lái)了新的挑戰(zhàn)。本文對(duì)光伏電站接入對(duì)地區(qū)電網(wǎng)的繼電保護(hù)的影響及對(duì)策進(jìn)行了研究,論文的主要工作及取得的成果如下:首先,研究了光伏并網(wǎng)逆變器的控制策略,主要包括最大功率追蹤控制和光伏逆變器兩種常用的控制策略,一種是傳統(tǒng)控制策略,另一種是動(dòng)態(tài)無(wú)功電壓支撐控制策略。其次,在DIgSILENT/Power Factory軟件中建立了光伏逆變器的仿真模型,仿真研究了不同故障程度下光伏逆變器的短路電流特性;建立了光伏電站通過(guò)專用送出線路接入110k V系統(tǒng)的典型并網(wǎng)模型,仿真研究了不同短路故障類型下光伏電站故障電壓電流特性和弱電源特性,同時(shí)仿真研究了不同控制策略下光伏電站送出線路兩側(cè)電流的相位特性。然后,考慮了光伏并網(wǎng)逆變器輸出短路電流達(dá)到限幅和未達(dá)到限幅兩種情況,從短路點(diǎn)位置、光伏電站容量和接入位置三個(gè)方面理論推導(dǎo)了光伏電站接入典型配電網(wǎng)后各處電流保護(hù)的計(jì)算公式,總結(jié)了光伏電站接入對(duì)電流保護(hù)影響的規(guī)律,仿真驗(yàn)證了理論分析的正確性并給出了改善方法。最后,理論分析了光伏電站接入對(duì)送出線路距離保護(hù)產(chǎn)生影響的原因,提出了一種利用線路兩側(cè)信息的光伏電站送出線路自適應(yīng)距離保護(hù)方法,仿真驗(yàn)證了理論分析的正確性和所提改善對(duì)策的可行性。
[Abstract]:In recent years, in order to deal with the two major problems of energy and environment that restrict the development of human society, many countries have begun to seek new solutions, and large-scale photovoltaic power generation has come into being in this context. A large number of photovoltaic power plants are connected to the traditional power grid, which not only increases the flexibility of the system operation mode, but also increases the complexity of the system structure. This paper studies the impact of photovoltaic power station access on the relay protection of regional power network and the countermeasures. The main work and achievements are as follows: first of all, The control strategy of grid-connected photovoltaic inverter is studied, which includes two common control strategies: maximum power tracking control and photovoltaic inverter, one is traditional control strategy, the other is dynamic reactive voltage support control strategy. The simulation model of photovoltaic inverter is established in DIgSILENT/Power Factory software, the short-circuit current characteristics of photovoltaic inverter under different fault degree are simulated, and the typical grid-connected model of photovoltaic power station connected to 110kV system by special transmission line is established. The characteristics of voltage and current and weak power supply of photovoltaic power station under different short-circuit fault types are studied by simulation, and the phase characteristics of the current on both sides of the output line of photovoltaic power station under different control strategies are also simulated. When the output short-circuit current of photovoltaic grid-connected inverter reaches the limit and does not reach the limit, the short circuit position is considered. In this paper, three aspects of the capacity and access position of photovoltaic power station are discussed. The calculation formulas of the current protection after the photovoltaic power station is connected to the typical distribution network are deduced, and the law of the influence of the access of the photovoltaic power station on the current protection is summarized. The simulation verifies the correctness of the theoretical analysis and gives the improvement method. Finally, the reason of the influence of the photovoltaic power station access on the distance protection of the transmission line is analyzed theoretically. This paper presents an adaptive distance protection method for photovoltaic power transmission lines based on the information on both sides of the line. The simulation results verify the correctness of the theoretical analysis and the feasibility of the proposed improvement measures.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM615;TM77

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相關(guān)期刊論文 前10條

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本文編號(hào)：1640617