【摘要】：分布式電源憑借著其環(huán)境友好、經(jīng)濟(jì)高效、節(jié)能環(huán)保等優(yōu)點(diǎn)被廣泛接受,接入配電系統(tǒng)后,使配電系統(tǒng)由單電源供電的輻射型網(wǎng)絡(luò)變?yōu)楹卸鄠�(gè)電源點(diǎn)的供電網(wǎng)絡(luò),導(dǎo)致配電系統(tǒng)的運(yùn)行方式發(fā)生重大改變,需要重新對其可靠性進(jìn)行評估。本文圍繞此問題展開更深一步的研究。首先提出了基于饋線分區(qū)的配電網(wǎng)可靠性評估方案。全面考慮饋線、配電變壓器、斷路器、隔離開關(guān)等元件的故障,計(jì)算各個(gè)分區(qū)在不同情況下的可靠性指標(biāo),再以最小分區(qū)為單元遍歷整個(gè)配電系統(tǒng),評估配電網(wǎng)的可靠性。與傳統(tǒng)的以元件為單元進(jìn)行故障枚舉評估配電系統(tǒng)可靠性的方法相比,該方法評估效率更高,考慮影響因素更全面,評估結(jié)果更接近實(shí)際情況。接著計(jì)及分布式電源及負(fù)荷的隨機(jī)性,建立其功率輸出的概率模型。為考慮風(fēng)速與太陽能的隨機(jī)性和間歇性,統(tǒng)計(jì)大量的風(fēng)速及太陽能數(shù)據(jù),將這些數(shù)據(jù)擬合,得出更貼近實(shí)際情況的概率分布函數(shù),再由分布式發(fā)電系統(tǒng)的功率輸出模型,建立分布式發(fā)電系統(tǒng)的概率密度函數(shù);通過統(tǒng)計(jì)負(fù)荷功率與時(shí)間的關(guān)系,并將其隨機(jī)性及波動(dòng)性考慮在內(nèi),得出負(fù)荷功率的概率密度函數(shù)。從反映分區(qū)內(nèi)輸入輸出關(guān)系出發(fā),計(jì)算各負(fù)荷點(diǎn)可靠運(yùn)行的概率。針對分布式電源接入配電系統(tǒng),設(shè)計(jì)基于饋線分區(qū)與故障模式影響分析相結(jié)合的評估方案。規(guī)定分布式電源接入配電系統(tǒng)后的分區(qū)原則;基于故障模式影響分析法設(shè)計(jì)各類分區(qū)的搜索方案;再根據(jù)各負(fù)荷點(diǎn)可靠運(yùn)行概率及分區(qū)方案求取各分區(qū)的可靠性指標(biāo),評估配電系統(tǒng)的可靠性。為分析不同容量及不同種類的分布式電源對配電網(wǎng)的影響,采用四種不同的分布式電源接入方案,對其結(jié)果進(jìn)行分析。最后以IEEE-RBTS-BUS6為例,分別對四種不同的接入方案進(jìn)行仿真分析。計(jì)算結(jié)果表明分布式電源的四種不同接入方案都不同程度地提高了系統(tǒng)的可靠性指標(biāo)。
[Abstract]:With the advantages of friendly environment, economy, high efficiency, energy saving and environmental protection, the distributed power supply system is widely accepted. After connecting to the distribution system, the distribution system can be changed from a radiative network with a single power supply to a power supply network with multiple power points. It is necessary to re-evaluate the reliability of distribution system because of its significant change in operation mode. This paper focuses on the further study of this problem. Firstly, the reliability evaluation scheme of distribution network based on feeder area is proposed. Considering the faults of feeder, distribution transformer, circuit breaker, isolator and so on, the reliability index of each partition in different conditions is calculated, and then the distribution system is traversed with the minimum partition as the unit, and the reliability of distribution network is evaluated. Compared with the traditional fault enumeration method based on components, this method is more efficient, more comprehensive in considering the influence factors, and closer to the actual situation. Then considering the randomness of distributed power generation and load, the probabilistic model of power output is established. In order to consider the randomness and intermittency of wind speed and solar energy, a large amount of wind speed and solar energy data are counted, and the probability distribution function, which is closer to the actual situation, is obtained by fitting these data, and then the power output model of distributed generation system is obtained. The probability density function of distributed generation system is established, and the probability density function of load power is obtained by counting the relationship between load power and time, and taking its randomness and fluctuation into account. The probability of reliable operation of each load point is calculated by reflecting the relation between input and output within the partition. For distributed power supply access distribution system, an evaluation scheme based on feeder partition and fault mode impact analysis is designed. Prescribes the partition principle after the distributed power supply is connected to the distribution system, designs the search scheme of all kinds of districts based on the fault mode influence analysis method, and then calculates the reliability index of each district according to the reliable operation probability of each load point and the partition scheme, Assess the reliability of the distribution system. In order to analyze the influence of different capacity and different kinds of distributed generation on distribution network, four different kinds of distributed power supply access schemes are adopted, and the results are analyzed. Finally, taking IEEE-RBTS-BUS6 as an example, four different access schemes are simulated and analyzed. The results show that the four different access schemes of distributed power supply improve the reliability index of the system to some extent.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TM732

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