發(fā)布時(shí)間：2018-05-14 20:15

  本文選題：電壓暫降 + 敏感設(shè)備　； 參考：《華北電力大學(xué)》2014年碩士論文

【摘要】：本論文針對(duì)電壓暫降特性及其對(duì)敏感設(shè)備影響評(píng)估問(wèn)題進(jìn)行研究。為更透徹地認(rèn)識(shí)電壓暫降這一現(xiàn)象,基于對(duì)我國(guó)多個(gè)地區(qū)電能質(zhì)量監(jiān)測(cè)系統(tǒng)記錄的大量電壓暫降事件的分析,給出了更為廣泛、切合實(shí)際的電壓暫降分類(lèi),并對(duì)暫降特征進(jìn)行了分析；研究了可表征電壓暫降發(fā)生前、暫降后、暫降期間與過(guò)渡期間等階段的波形特征的特征量,結(jié)合實(shí)測(cè)波形進(jìn)行了統(tǒng)計(jì)分析,給出了電壓暫降幅值、持續(xù)時(shí)間、暫降頻次、暫降起始點(diǎn)、相位跳變5個(gè)特征量的分布特征、范圍,并研究了相位跳變的傳播特性。 針對(duì)傳統(tǒng)方法對(duì)電壓暫降過(guò)度評(píng)估問(wèn)題,結(jié)合設(shè)備電壓敏感曲線提出了采用多暫降閾值和持續(xù)時(shí)間的電壓暫降新型描述方法,并在此基礎(chǔ)上提出了針對(duì)設(shè)備敏感性評(píng)估的單個(gè)事件、站點(diǎn)評(píng)估方法,給出了站點(diǎn)暫降描述圖的概念,可與設(shè)備電壓免疫曲線方便的結(jié)合起來(lái),評(píng)估設(shè)備因暫降發(fā)生故障的頻次與頻次區(qū)間；提出了基于新型描述方法的電壓暫降嚴(yán)重程度綜合指標(biāo),較好解決了傳統(tǒng)方法存在的過(guò)度評(píng)估與不精確問(wèn)題。最后運(yùn)用所提出的評(píng)估方法對(duì)PLC、 ASD、AC Relay、PC四類(lèi)典型敏感設(shè)備電壓暫降免疫能力進(jìn)行評(píng)估,并與傳統(tǒng)方法所得結(jié)果進(jìn)行了對(duì)比分析,驗(yàn)證了文中所分析的傳統(tǒng)方法過(guò)度評(píng)估的缺點(diǎn),以及采用本文方法進(jìn)行設(shè)備電壓暫降免疫能力評(píng)估的可行性。
[Abstract]:In this paper, the characteristics of voltage sag and its impact on sensitive equipment are studied. In order to understand the voltage sag more thoroughly, based on the analysis of a large number of voltage sag events recorded by the power quality monitoring system in many regions of China, a more extensive and practical classification of voltage sag is given. The characteristics of the voltage sag before, after, during and during the transient period are studied, and the statistical analysis of the measured waveform is carried out, and the voltage temporary drop value is given, which can be used to characterize the waveform characteristics of the voltage sag before, after, during, and during the transition period, and the statistical analysis is carried out on the basis of the statistical analysis of the measured waveform. The distribution and range of five characteristic variables, such as duration, frequency, starting point and phase jump, are studied. The propagation characteristics of phase jump are also studied. Aiming at the problem of overevaluation of voltage sag by traditional methods, a new description method of voltage sag based on multi-sags threshold and duration is proposed in combination with the voltage sensitive curve of equipment. On this basis, a single event and site evaluation method for device sensitivity evaluation are proposed, and the concept of station transient description diagram is given, which can be easily combined with the voltage and immune curve of the equipment. The frequency and frequency range of equipment fault due to transient drop are evaluated, and the comprehensive index of voltage sag severity based on new description method is proposed, which solves the problem of over-evaluation and inaccuracy in traditional methods. Finally, the proposed evaluation method is used to evaluate the immune ability of four typical sensitive devices, PLC, ASDX AC Relay-PC, and the results are compared with those obtained by the traditional methods. The shortcomings of the traditional methods are verified. And the feasibility of using this method to evaluate the immune ability of equipment voltage sag.
【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(lèi)號(hào)】：TM712

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本文編號(hào)：1889307