本文選題：大規(guī)模新能源 + 連鎖故障場景��； 參考：《華北電力大學》2017年碩士論文

【摘要】：當前我國千萬千瓦級風電基地以及百萬千瓦級光伏發(fā)電基地不斷建設,新能源裝機在電網(wǎng)中所占比重不斷增大,同時近年來國內(nèi)外發(fā)生了多起含大規(guī)模新能源系統(tǒng)連鎖跳閘的運行事故。在此背景下,本文構建大規(guī)模新能源并網(wǎng)下可能連鎖故障場景,提取出其連鎖故障發(fā)展新特征并提出相應的防控措施具有重要且現(xiàn)實的意義。首先,深入探討了包括雙饋風電機組與光伏發(fā)電系統(tǒng)在內(nèi)的新能源發(fā)電模型,在此基礎上,基于PSD-BPA電力系統(tǒng)分析仿真程序搭建了含大規(guī)模新能源的IEEE39節(jié)點系統(tǒng),通過不斷改變IEEE39節(jié)點系統(tǒng)內(nèi)新能源滲透率,分別探究了新能源滲透率與系統(tǒng)頻率穩(wěn)定性、電壓穩(wěn)定性以及功角穩(wěn)定性的關系,仿真結果表明隨著新能源滲透率不斷增高,系統(tǒng)的穩(wěn)定性變差,穩(wěn)定裕度降低。其次,根據(jù)系統(tǒng)內(nèi)新能源的消納形式將含大規(guī)模新能源的電力系統(tǒng)分為新能源就地消納型和外送型兩類系統(tǒng)。通過對現(xiàn)有含大規(guī)模新能源系統(tǒng)內(nèi)連鎖故障發(fā)生原因的分析以及相關理論知識,對每類系統(tǒng)下連鎖故障的可能發(fā)展過程進行了定性分析。受此啟發(fā),通過大量的仿真計算工作構建了每類系統(tǒng)下可能連鎖故障場景。通過對連鎖故障場景的梳理與分析,經(jīng)與不含新能源電網(wǎng)對比,提出了大規(guī)模新能源并網(wǎng)下連鎖故障可能具有的三個新特征。最后,綜合考慮大規(guī)模新能源并網(wǎng)下連鎖故障發(fā)展的新特征、新能源機組的故障穿越能力以及相關技術規(guī)定,提出可以通過采用改變風機電壓及頻率保護的整定值或者增加延時的方法,防止發(fā)生大面積新能源機組脫網(wǎng),預防連鎖故障的發(fā)生,并通過實際電網(wǎng)仿真驗證了所提措施的有效性。
[Abstract]:At present, the construction of wind power bases of ten million kilowatts and photovoltaic power generation bases of one million kilowatts in our country is continuing, and the proportion of new energy installed in the power grid is increasing. At the same time, in recent years, there have been many operation accidents with large scale new energy system chain tripping at home and abroad. Under this background, it is very important and realistic to construct a large-scale new energy source and possible cascading fault scene under the net, extract the new characteristics of its cascading fault development and put forward the corresponding prevention and control measures. Firstly, the new energy generation model, including doubly-fed wind turbine and photovoltaic power generation system, is deeply discussed. Based on this, a IEEE39 node system with large-scale new energy is built based on PSD-BPA power system analysis simulation program. By continuously changing the new energy permeability in the IEEE39 node system, the relationship between the new energy permeability and the system frequency stability, voltage stability and power angle stability is explored, respectively. The simulation results show that the new energy permeability increases with the increase of the new energy permeability. The stability of the system becomes worse and the stability margin decreases. Secondly, according to the absorption form of new energy in the system, the power system with large-scale new energy can be divided into two types: new energy in-situ absorption type and outgoing type. Based on the analysis of the causes of cascading faults in existing large-scale new energy systems and related theoretical knowledge, the possible development process of cascading faults in each type of system is qualitatively analyzed. Inspired by this, the possible cascading fault scenarios under each kind of system are constructed through a lot of simulation work. By combing and analyzing the scenario of cascading faults, and comparing with the grid without new energy, three new characteristics of large-scale new energy and offline cascading faults are put forward. Finally, considering the new characteristics of large-scale new energy and offline cascading fault development, the fault traversing capacity of new energy units and related technical regulations, It is put forward that by changing the setting value of fan voltage and frequency protection or increasing delay time, it can prevent a large area of new energy generating units from getting off the grid and prevent the occurrence of cascading faults. The effectiveness of the proposed measures is verified by the actual power grid simulation.
【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM732

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