本文選題：微電網(wǎng) + 逆變型電源��； 參考：《山東大學(xué)》2017年碩士論文

【摘要】：一種由分布式電源、儲能裝置、智能化用戶與可控負(fù)荷、監(jiān)控和保護(hù)裝置構(gòu)成的新型供電系統(tǒng),即"微電網(wǎng)",成為了解決配電網(wǎng)分布式電源高度滲透的重要途徑。然而,微電網(wǎng)運(yùn)行方式靈活多變,且內(nèi)部分布式電源以逆變型電源為主,給傳統(tǒng)配電網(wǎng)保護(hù)原理帶來了嚴(yán)峻的考驗(yàn)。微電網(wǎng)拓?fù)浣Y(jié)構(gòu)復(fù)雜多樣,上級電網(wǎng)饋線保護(hù)、并網(wǎng)點(diǎn)保護(hù)、微電網(wǎng)內(nèi)部元件保護(hù)間的合理配合也成為了微電網(wǎng)保護(hù)研究的難點(diǎn)之一。對此,本文以微電網(wǎng)并網(wǎng)點(diǎn)保護(hù)與微電網(wǎng)饋線保護(hù)為對象開展研究,論文的主要工作與取得的成果如下所述。(1)在逆變型分布式電源故障特征的研究基礎(chǔ)上,分別分析了傳統(tǒng)保護(hù)原理中功率方向元件與正序故障分量方向元件在含逆變型電源配電網(wǎng)中的適用性,為微電網(wǎng)并網(wǎng)點(diǎn)保護(hù)及內(nèi)部饋線保護(hù)原理的研究提供理論基礎(chǔ)。(2)根據(jù)故障隔離策略對并網(wǎng)點(diǎn)開關(guān)動作行為的要求,利用不同故障情形下的延時環(huán)節(jié)實(shí)現(xiàn)并網(wǎng)點(diǎn)保護(hù)與上級電網(wǎng)饋線保護(hù)、微電網(wǎng)內(nèi)部饋線保護(hù)、并網(wǎng)運(yùn)行規(guī)范要求間的邏輯配合。利用并網(wǎng)點(diǎn)故障前后正序功率方向與正序電流幅值變化,提出了一種并網(wǎng)點(diǎn)處新型故障方向判別方法,并設(shè)計(jì)了過電流保護(hù)、低電壓保護(hù)作為輔助判據(jù),解決了三相金屬性短路故障時的方向判別死區(qū)問題。(3)借鑒電流差動保護(hù)原理思想,基于微電網(wǎng)饋線區(qū)內(nèi)外故障時正序差動阻抗的幅值差異,提出了一種適用于微電網(wǎng)饋線故障特征的正序阻抗差動保護(hù)原理。為進(jìn)一步改善保護(hù)性能,有效應(yīng)對分支負(fù)荷的影響,構(gòu)造了帶制動特性的動作判據(jù)。針對區(qū)內(nèi)三相金屬性短路故障時保護(hù)存在的死區(qū)問題,利用故障時正序阻抗與正序電流幅值特征構(gòu)造了輔助判據(jù)。與傳統(tǒng)電流差動保護(hù)相比,所提方法無需兩端數(shù)據(jù)同步采樣,對通信要求較低。以智能測控終端為平臺,設(shè)計(jì)了保護(hù)軟件流程,開發(fā)了面向工程實(shí)際的正序阻抗差動保護(hù)裝置。軟件仿真與裝置測試結(jié)果均驗(yàn)證了保護(hù)原理的有效性。(4)基于不同故障類型下微電網(wǎng)饋線保護(hù)安裝處各故障相能量函數(shù)的特征分析,提出了一種基于故障超前相的能量方向縱聯(lián)保護(hù)方法。構(gòu)造了幅值輔助判據(jù)以克服區(qū)內(nèi)分支負(fù)荷投切的影響,研究了正序分量控制的逆變型分布式電源接入情形下保護(hù)原理的適應(yīng)性。仿真結(jié)果表明,保護(hù)原理能夠正確識別故障方向,并能躲過負(fù)荷投切的影響,且具有一定的抗過渡電阻的能力。
[Abstract]:A new type of power supply system, which is composed of distributed power supply, energy storage device, intelligent user and controllable load, monitoring and protection device, has become an important way to solve the problem of high penetration of distributed power supply in distribution network. However, the operation mode of microgrid is flexible and changeable, and the internal distributed power supply is mainly inverter, which brings a severe test to the traditional distribution network protection principle. The topology of microgrid is complex and diverse, the feeder protection of higher power network, and the protection of dot point, and the reasonable cooperation between the protection elements of microgrid has become one of the difficulties in the research of microgrid protection. In this paper, the microgrid parallel network protection and microgrid feeder protection are studied. The main work and achievements are as follows: 1) on the basis of the research on the fault characteristics of inverter distributed generation, The applicability of the power directional element and the positive sequence fault component directional element in the traditional protection principle in the distribution network with inverter power supply is analyzed respectively. To provide a theoretical basis for the study of the principle of parallel network protection and internal feeder protection in microgrid. (2) according to the requirements of fault isolation strategy, the operation behavior of parallel node switch is required. The logic cooperation between parallel dot protection and feeder protection of higher power network, internal feeder protection of microgrid, and operation specification of grid connection is realized by using delay link in different fault cases. Based on the change of the positive sequence power direction and the positive sequence current amplitude before and after the fault, a new fault direction discrimination method is proposed, and the overcurrent protection is designed, and the low voltage protection is used as the auxiliary criterion. The problem of direction-discriminating dead zone in three-phase gold attribute short-circuit fault is solved. The principle of current differential protection is used for reference. Based on the amplitude difference of positive sequence differential impedance when the fault inside and outside the feeder area of microgrid is used as reference, A positive sequence impedance differential protection principle is proposed for microgrid feeder fault characteristics. In order to further improve the protection performance and effectively deal with the influence of branch load, an action criterion with braking characteristics is constructed. In view of the dead zone problem in the fault of three-phase gold attribute short-circuit fault, an auxiliary criterion is constructed by using the characteristics of the positive sequence impedance and the amplitude of positive sequence current. Compared with the traditional current differential protection, the proposed method does not require simultaneous data sampling at both ends, and requires less communication. On the platform of intelligent measurement and control terminal, the protection software flow is designed, and a positive sequence impedance differential protection device is developed for engineering practice. Software simulation and device test results both verify the validity of the protection principle. Based on the characteristic analysis of each fault phase energy function of the microgrid feeder protection installation under different fault types, the software simulation and the device test results verify the effectiveness of the protection principle. An energy directional longitudinal protection method based on fault leading phase is proposed. The amplitude auxiliary criterion is constructed to overcome the influence of branch load switching in the region, and the adaptability of the protection principle in the case of inverse distributed power supply with positive sequence component control is studied. The simulation results show that the protection principle can correctly identify the fault direction, avoid the influence of load switching, and has the ability to resist the transition resistance.
【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】：TM77

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