【摘要】：隨著電網(wǎng)規(guī)模的增大和運行復(fù)雜程度的提高,電網(wǎng)企業(yè)有必要準(zhǔn)確掌握現(xiàn)有電力系統(tǒng)所能提供的可靠性水平,衡量系統(tǒng)將電能從供應(yīng)點輸送到輸電節(jié)點的輸電能力(Transmission Deliverability)�；谶\行統(tǒng)計的輸電網(wǎng)可靠性評價能夠真實的反應(yīng)電網(wǎng)的設(shè)備、結(jié)構(gòu)和運行管理水平,因此逐步受到各國重視�，F(xiàn)階段輸電網(wǎng)可靠性評價是以輸變電設(shè)施可靠性評價為基礎(chǔ),為了計及設(shè)施之間的相關(guān)停運特征,又進(jìn)一步建立了回路的可靠性評價指標(biāo)。然而電網(wǎng)運行環(huán)境的改變和可靠性評價內(nèi)容的拓寬使得我國現(xiàn)階段的可靠性評價指標(biāo)在實際應(yīng)用中逐漸顯現(xiàn)了諸多局限。據(jù)此,本文在結(jié)合國外輸電網(wǎng)可靠性評價指標(biāo)體系的構(gòu)建準(zhǔn)則和特點的基礎(chǔ)上,深入剖析了我國輸電網(wǎng)可靠性評價指標(biāo)體系,提出對輸變電設(shè)施和回路的可靠性評價指標(biāo)模型的改進(jìn)。首先,從國內(nèi)外設(shè)施可靠性評價指標(biāo)的差異出發(fā),對比了評價對象、可靠性狀態(tài)劃分和指標(biāo)設(shè)置的不同,根據(jù)指標(biāo)應(yīng)用狀況和可靠性水平對比提煉出對我國設(shè)施可靠性指標(biāo)的需求從而擴展了多重故障停運、共因故障停運、不同壽命階段故障停運和計及檢修的故障停運這四方面的評價指標(biāo)及元件停運模型。其次,電網(wǎng)企業(yè)對資產(chǎn)精益化管理的要求使得在保證輸電網(wǎng)可靠性的同時需兼顧經(jīng)濟性,為此將全壽命周期成本理念應(yīng)用到輸電網(wǎng)可靠性評價中,確立系統(tǒng)的整個壽命周期內(nèi)各階段發(fā)生的成本與元件可靠性水平的關(guān)聯(lián)關(guān)系,建立了輸電能力模糊綜合評價模型,完善輸電網(wǎng)可靠性統(tǒng)計評價分析方法。然后,利用圖論理論將變電站內(nèi)元件的連接方式轉(zhuǎn)換為可靠性邏輯上的串聯(lián)或并聯(lián)形式,再通過深度搜索算法就可將變電站主接線等價為最小回路集,并最終建立輸電網(wǎng)的回路模型,分析了現(xiàn)有基于回路的輸電能力評價指標(biāo)存在的兩大問題,并據(jù)此提出計及網(wǎng)絡(luò)特征的輸電能力評價指標(biāo)。最后以青海省某局部輸電網(wǎng)的實際案例為例,通過將本文建立的輸電網(wǎng)可靠性評價指標(biāo)與原評價指標(biāo)的對比、分析和計算以及輸電能力模糊綜合評價模型的應(yīng)用,證明了所建評價指標(biāo)和模型的有效性。
[Abstract]:With the increase of power network scale and operation complexity, it is necessary for power grid enterprises to accurately grasp the reliability level provided by the existing power system and measure the transmission capacity of the system from the supply point to the transmission node (Transmission Deliverability). The reliability evaluation of transmission network based on operation statistics can truly reflect the equipment, structure and operation management level of the network, so it has been paid more and more attention by many countries. At present, the reliability evaluation of transmission network is based on the reliability evaluation of transmission and transformation facilities. In order to take into account the relevant outage characteristics between the facilities, the reliability evaluation index of the circuit is further established. However, with the change of power network operation environment and the widening of reliability evaluation content, the reliability evaluation index in our country at the present stage has gradually shown many limitations in practical application. On the basis of this, based on the construction criteria and characteristics of foreign power transmission network reliability evaluation index system, this paper deeply analyzes the transmission network reliability evaluation index system of our country. The improvement of reliability evaluation index model for transmission and transformation facilities and circuits is presented. First of all, according to the difference of the reliability evaluation index at home and abroad, the paper compares the evaluation object, the reliability state division and the index setting. According to the application status and reliability level of the index, the demand for the reliability index of the facilities in our country is extracted, thus expanding the multi-failure outage, and the common cause of the failure outage. The evaluation index and component outage model of failure outage in different life stages and taking into account the fault outage of inspection and repair are discussed. Secondly, the requirement of lean management of assets in power grid enterprises makes it necessary to give consideration to economy while ensuring the reliability of transmission network. Therefore, the concept of life-cycle cost is applied to the reliability evaluation of transmission network. The relationship between the cost and the reliability level of components during the whole life cycle of the system is established. The fuzzy comprehensive evaluation model of transmission capacity is established and the statistical evaluation method of transmission network reliability is improved. Then, by using graph theory, the connecting mode of the components in the substation is transformed into the series or parallel form of reliability logic, and the main wiring of the substation can be equivalent to the minimum loop set by the depth search algorithm. Finally, the circuit model of transmission network is established, and two problems existing in the existing evaluation index of transmission capability based on circuit are analyzed, and the evaluation index of transmission capacity taking into account the characteristics of the network is put forward. Finally, taking the actual case of a local transmission network in Qinghai province as an example, by comparing the reliability evaluation index of transmission network established in this paper with the original evaluation index, the analysis and calculation as well as the application of fuzzy comprehensive evaluation model of transmission capacity are made. The validity of the evaluation index and model is proved.
【學(xué)位授予單位】：華北電力大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM732

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