【摘要】：隨著大規(guī)�？稍偕茉春椭绷髫�(fù)荷接入電網(wǎng)等問題的出現(xiàn),直流輸電的優(yōu)勢越來越突出。而“五交三直”西電東送新格局的形成,也促進(jìn)了交直流并聯(lián)系統(tǒng)和交直流混聯(lián)系統(tǒng)的發(fā)展。針對交直流電網(wǎng)的開展,其可靠性問題也引起了越來越多的關(guān)注。目前,交流系統(tǒng)和兩端直流系統(tǒng)的可靠性評(píng)估已經(jīng)日益成熟,而針對規(guī)模不斷增大,結(jié)構(gòu)日益復(fù)雜的直流電網(wǎng)和交直流混聯(lián)電網(wǎng)的可靠性評(píng)估還剛起步。 本論文在對已有的可靠性評(píng)估方法進(jìn)行對比分析的基礎(chǔ)上,根據(jù)直流電網(wǎng)以及交直流混聯(lián)電網(wǎng)的特點(diǎn),選取了頻率與持續(xù)時(shí)間法(FD法)和最小割集法作為基礎(chǔ)方法,對直流電網(wǎng)和交直流混聯(lián)電網(wǎng)的可靠性評(píng)估模型和評(píng)估方法進(jìn)行了綜合性研究。首先基于FD法提出一種適用于直流電網(wǎng)的可靠性評(píng)估等效模型,該模型避免了由于元件眾多而出現(xiàn)的維數(shù)災(zāi),減少了計(jì)算量；還可以計(jì)算除穩(wěn)態(tài)概率以外的可靠性指標(biāo),如故障頻率指標(biāo)、持續(xù)時(shí)間指標(biāo)等。簡單直流電網(wǎng)算例的可靠性計(jì)算結(jié)果證明了本方法的正確性和有效性。對系統(tǒng)薄弱環(huán)節(jié)的計(jì)算和參數(shù)靈敏度分析表明海底電纜和海上換流器是影響系統(tǒng)可靠性的薄弱環(huán)節(jié)。然后結(jié)合FD法和最小割集法提出一種適用于交直流混聯(lián)電網(wǎng)的可靠性評(píng)估方法。該方法對直流系統(tǒng)和交流系統(tǒng)分別建立等效模型,然后再對整個(gè)電網(wǎng)進(jìn)行可靠性計(jì)算,得到了電網(wǎng)內(nèi)各節(jié)點(diǎn)的失負(fù)荷概率、失負(fù)荷頻率、失負(fù)荷持續(xù)時(shí)間以及電力不足期望值等可靠性指標(biāo)。通過對負(fù)荷點(diǎn)可靠性指標(biāo)的分析,可以找出電網(wǎng)的薄弱環(huán)節(jié)。以含兩端直流輸電系統(tǒng)和多端直流輸電系統(tǒng)的混聯(lián)電網(wǎng)為例,對上述可靠性評(píng)估方法進(jìn)行驗(yàn)證,計(jì)算結(jié)果可以反映出系統(tǒng)中網(wǎng)絡(luò)節(jié)點(diǎn)的可靠性水平,很好的證明了本方法的正確性和可行性。
[Abstract]:With the emergence of large-scale renewable energy and DC load connected to the power grid, the advantages of DC transmission become more and more prominent. The formation of a new pattern of "five AC and three straight" power transmission from west to east also promotes the development of AC / DC parallel system and AC / DC hybrid system. For the development of AC / DC power network, its reliability has attracted more and more attention. At present, the reliability evaluation of AC system and DC system has become more and more mature, but the reliability evaluation of DC network and AC / DC hybrid network with increasing scale and complex structure is still in its infancy. On the basis of comparing and analyzing the existing reliability evaluation methods, according to the characteristics of DC network and AC / DC hybrid network, the frequency and duration method (FD) and minimum cut set method are selected as the basic methods. The reliability evaluation model and evaluation method of DC and AC / DC hybrid networks are studied. Firstly, based on FD method, an equivalent model for reliability evaluation of DC network is proposed, which avoids the disaster of dimensionality due to the large number of components and reduces the amount of calculation. Besides the steady state probability, the reliability index, such as fault frequency index, duration index and so on, can also be calculated. The reliability calculation results of a simple DC network example show that the method is correct and effective. The calculation of weak links and the sensitivity analysis of parameters show that submarine cables and offshore converters are the weak links that affect the reliability of the system. Then a reliability evaluation method for AC / DC hybrid networks is proposed by combining the FD method and the minimum cut set method. The equivalent models of DC system and AC system are established by this method, then the reliability of the whole power network is calculated, and the load loss probability and frequency of each node in the power network are obtained. Reliability indicators such as the duration of load loss and the expected value of insufficient electricity. By analyzing the reliability index of load point, we can find out the weak link of power network. The reliability evaluation method mentioned above is verified by the example of the hybrid power network with both ends of HVDC transmission system and multi-terminal HVDC transmission system. The calculated results can reflect the reliability level of the network nodes in the system. The correctness and feasibility of this method are well proved.
【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】：2014
【分類號(hào)】：TM732

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