本文關(guān)鍵詞： 克里金插值法 動態(tài)熱定值 蒙特卡羅方法 線路分段　出處：《山東大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：目前隨著經(jīng)濟社會的飛速發(fā)展,社會用電量不斷增加,輸電線路是電力系統(tǒng)的重要組成部分,由于受到現(xiàn)有輸電線路技術(shù)規(guī)程的制約,輸電線路的傳輸容量受到了限制。提高電力系統(tǒng)的輸配電容量可架設(shè)新的輸電線路,但輸電線路的建設(shè)耗資巨大且建設(shè)周期較長,因此如何更好地發(fā)揮現(xiàn)有輸電元件的輸電能力一直是電力部門十分關(guān)注的問題。首先,輸電線路的熱載荷能力與實時環(huán)境參數(shù)有關(guān),影響輸電線路熱載荷能力的主要環(huán)境參數(shù),如溫度、風(fēng)速、風(fēng)向等可由環(huán)境測量裝置測得,考慮到環(huán)境參數(shù)及架空輸電線路的空間分布特性,及環(huán)境測量裝置的有限性,本文首先研究對輸電線路周圍環(huán)境參數(shù)的估計方法,依據(jù)最常見的反距離插值法(Inverse Distance Weighted,IDW)以及廣泛應(yīng)用的普通克里金(Ordinary Kriging,OK)插值法,實現(xiàn)架空輸電線路沿線無測量裝置處環(huán)境參數(shù)的估計。實現(xiàn)架空輸電線路熱載流能力的分布熱定值,不但減少投資成本,而且提高了線路載流定值的準(zhǔn)確性,具有一定的理論與實用價值。其次,本文對輸電線路熱載荷能力的求解方法進行研究,包括線路的靜態(tài)熱定值(Static Thermal Rating,STR)以及動態(tài)熱定值(Dynamic Thermal Rating,DTR),將由上述插值法得到的環(huán)境參數(shù)運用到輸電線路動態(tài)熱定值的求解中。由于獲得的環(huán)境參數(shù)具有不確定性,本文基于蒙特卡羅方法對環(huán)境參數(shù)的不確定度進行研究,利用輸電線路的熱平衡方程,依據(jù)IEEE標(biāo)準(zhǔn)和CIGRE標(biāo)準(zhǔn)建立輸電線路載流量的計算模型并進行不確定度分析。最后,由于線路溫度對輸電線路阻抗有影響,對于遠距離的輸電線路而言溫度對阻抗的影響不可忽略。本文假設(shè)輸電線路沿線溫度與環(huán)境溫度無限接近,研究溫度對線路參數(shù)的影響,依據(jù)線路沿線溫度分布情況對其分段,研究遠距離輸電線路的分段方法,并實現(xiàn)輸電線路分段熱定值。依據(jù)陜西電網(wǎng)地理接線圖,選取從榆橫到信義距離為386.7km,電壓等級為750kV的架空輸電線路,研究單機-單負荷系統(tǒng)的線路在不同溫度下對應(yīng)負荷的PV曲線特性。研究架空輸電線路沿線溫度的分布特性對系統(tǒng)運行狀態(tài)的影響。本文利用插值方法實現(xiàn)了空間上環(huán)境參數(shù)的估計,通過蒙特卡羅方法評定不確定度,以及給出了基于溫度的輸電線路分段方法,可以有效提高線路的傳輸容量,挖掘電網(wǎng)輸電能力。
[Abstract]:At present, with the rapid development of economy and society, social electricity consumption is increasing. Transmission line is an important part of power system, which is restricted by the existing transmission line technical regulations. The transmission capacity of transmission lines is limited. New transmission lines can be set up by increasing the transmission and distribution capacity of power systems, but the construction of transmission lines is expensive and has a long construction period. Therefore, how to make better use of the transmission capacity of existing transmission elements has been a problem of great concern in the power sector. Firstly, the thermal load capacity of transmission lines is related to real-time environmental parameters. The main environmental parameters, such as temperature, wind speed and wind direction, which affect the thermal load capacity of transmission lines, can be measured by the environmental measurement device, taking into account the environmental parameters and the spatial distribution characteristics of overhead transmission lines. And the limitation of the environmental measurement device, this paper first studies the method of estimating the environmental parameters around the transmission line. Inverse Distance Weighted is based on the most common inverse distance interpolation method. IDW) and the widely used ordinary Kriging KrigingOK interpolation method. To realize the estimation of environmental parameters without measuring devices along overhead transmission lines, and to realize the distribution caloric value of heat load capacity of overhead transmission lines, not only reduce the cost of investment, but also improve the accuracy of line current setting. It has certain theoretical and practical value. Secondly, this paper studies the method to solve the thermal load capacity of transmission lines. It includes static Thermal dating and dynamic Thermal Rating. The environmental parameters obtained from the above interpolation method are applied to the solution of the dynamic caloric value of the transmission line. The obtained environmental parameters are uncertain. In this paper, the uncertainty of environmental parameters is studied based on Monte Carlo method, and the heat balance equation of transmission line is used. According to IEEE standard and CIGRE standard, the calculation model of transmission line carrier current is established and the uncertainty is analyzed. Finally, because of the influence of line temperature on transmission line impedance. For long-distance transmission lines, the influence of temperature on the impedance can not be ignored. This paper assumes that the temperature along the transmission line is infinitely close to the ambient temperature, and studies the influence of temperature on the line parameters. According to the temperature distribution along the line, this paper studies the segmentation method of long-distance transmission line, and realizes the segmental calorific value of transmission line. An overhead transmission line with a distance of 386.7 km and a voltage grade of 750 kV is selected. The PV curve characteristics of the line corresponding to the load at different temperatures are studied. The influence of the temperature distribution along the overhead transmission line on the operating state of the system is studied. In this paper, the interpolation method is used to realize the performance of the system. The estimation of environmental parameters in space. The uncertainty is evaluated by Monte Carlo method, and the temperature based transmission line segmentation method is given, which can effectively improve the transmission capacity of the transmission line and excavate the transmission capacity of the power grid.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM75

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本文編號：1455553