本文選題：輸電線路　切入點：熱載荷能力　出處：《山東大學》2017年碩士論文　論文類型：學位論文

【摘要】：電網(wǎng)的輸電能力制約著發(fā)電與負荷的發(fā)展,作為電力輸送的載體,輸電線路在電網(wǎng)的建設中扮演著關(guān)鍵的角色。輸電線路動態(tài)熱定值(dynamic thermal rating,DTR)以溫度作為限制輸電線路熱載荷能力的本質(zhì)因素,基于實際氣象環(huán)境并結(jié)合溫度變化的熱慣性熱點,得到最高允許溫度限制下的輸電線路最大允許載流。風能作為清潔能源和可再生能源越來越多地并入電網(wǎng),風電出力及線路熱載荷能力均受到氣象環(huán)境參數(shù)的影響,尤其是風速,對線路熱載荷能力及風電出力進行整合研究,更有效地利用DTR提高輸電線路熱載荷能力,提高風電消納能力,成為亟待研究的課題。此外,DTR描述輸電元件個體定值與電網(wǎng)的運行調(diào)度脫離,因此,將DTR與電網(wǎng)的運行調(diào)度及控制決策相結(jié)合對提高電網(wǎng)系統(tǒng)運行的安全性和穩(wěn)定性具有重要意義。首先,基于IEEE標準下的DTR評估模型,分析導體吸散熱機理。分析雨雪天氣條件下導體表面雨水積雪蒸發(fā)融化對導體溫度的影響,對IEEE標準模型下的導體吸散熱因子進行擴展,構(gòu)建包含蒸發(fā)散熱項的IEEE標準下的擴展因子估計模型。通過算例分析IEEE標準模型及其擴展因子模型下輸電線路熱載荷能力的差異性以及導體各項散熱量間的關(guān)系,分析蒸發(fā)散熱對導體熱平衡狀態(tài)以及對提高導線利用率的影響。其次,根據(jù)風電場一機一變集送電接線方式,綜合風機功率特性曲線和不同風速風向下輸電線路載流特性曲線,分析風電場送出線路載流量增容原理,并通過算例分析DTR對增加風電場風機投運數(shù)量以及提高電網(wǎng)風電消納能力的影響。分析影響輸電線路暫態(tài)過載能力的各項因素,通過算例分析暫態(tài)熱定值對緩解電力系統(tǒng)阻塞、減少系統(tǒng)切負荷以及降低系統(tǒng)切風率的作用。最后,結(jié)合導體溫度、導體允許載流越限時間和電力系統(tǒng)潮流規(guī)律,從系統(tǒng)運行、調(diào)度及決策的角度,實現(xiàn)DTR的超前應用。通過算例分析超前熱定值在處理電網(wǎng)預想事故中的作用與優(yōu)勢,并結(jié)合風功率預測,分析在含有風電場的電力系統(tǒng)中,風功率的變化對超前熱定值作用下的超前調(diào)度決策制定的影響。綜上,對輸電線路熱載荷能力與風力發(fā)電進行整合研究,并與電力系統(tǒng)的運行調(diào)度相結(jié)合,對提高電網(wǎng)的風電消納能力,保證系統(tǒng)的安全穩(wěn)定運行具有重要的意義。
[Abstract]:The power grid transmission capacity restricts the development of the electric power and load, as the carrier of power transmission, transmission line plays a key role in the construction of power grids. The dynamic thermal rating of transmission line (dynamic thermal, rating, DTR) with temperature as the essential factors limiting the heat capacity of transmission lines, the actual meteorological environment and hot thermal inertia with the change of temperature based on the transmission line, get the maximum allowable temperature limits the maximum allowable load flow. The wind energy is clean and renewable energy sources are increasingly incorporated into the grid, the impact of wind power output and line heat capacity are the meteorological environment parameters, especially the wind speed, on line heat capacity and wind power output integration, more effective use of DTR to improve the heat capacity of transmission lines, improve the absorptive capacity of wind power, becomes an urgent issue. In addition, DTR describes a transmission component Body fixed value from, and scheduling the operation of power grids will therefore, dispatching and control decision DTR and power combination is of great significance to improve the power system's safety and stability. Firstly, the DTR evaluation model of IEEE standard based on the analysis of absorption and dissipation mechanism. Influence on conductor conductor temperature of rain and snow under the condition of rain snow melting on the conductor surface evaporation, conductor IEEE standard model of the absorption and dissipation factor of expansion, construction of the evaporative heat dissipation factor contains extended IEEE standard estimation model. Through the example analysis of the relationship between the differences in transmission line heat capacity IEEE standard model and its extended model of the factor and the heat dissipation between the conductor the analysis of evaporation heat conductor of heat balance and to improve the effect of wire utilization. Secondly, according to the wind machine change in electric connection mode, comprehensive wind Transmission line machine power curve and wind load under different flow characteristic curve, flow capacity of wind load analysis principle of transmission lines, and through the example analysis of DTR to increase the number of wind field operation and improve the effect of wind power consumptive ability. The analysis of the factors influencing the transmission line transient overload capacity, through an example set the value of blocking to ease the analysis of power system transient heat, reduce system load shedding and reduce wind shear rate. Finally, combined with the current carrying conductor conductor temperature, allowing more limited time and tide law of power system, from the system, scheduling and decision-making point of view, application of advanced DTR. Through the example analysis in advance the heat setting function and advantages in the treatment of contingency in power grid, combined with wind power prediction, analysis in power system with wind farm, wind power changes of advanced thermal rating for With the influence of advanced scheduling decisions. Therefore, the integral research on transmission line thermal load capacity and wind power, and combined with the scheduling of power system, to improve the ability of accommodating wind power grid, which has important significance for the safe and stable operation of the system.

【學位授予單位】：山東大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM75;TM614

【參考文獻】

相關(guān)期刊論文 前10條

1 秦嘉南;房嶺鋒;盛戈v，

本文編號：1633227