【摘要】：隨著經(jīng)濟(jì)的發(fā)展,電網(wǎng)中各類負(fù)荷的出現(xiàn),三相不平衡問題日益嚴(yán)重,對三相不平衡源進(jìn)行責(zé)任劃分有助于提高用戶治理不平衡的主動性,對改善電能質(zhì)量有重要意義。三相不平衡源引起的公共連接點(diǎn)處母線電壓不對稱是供電部門關(guān)注的主要電能質(zhì)量問題之一,并以電壓(電流)不平衡度作為電能質(zhì)量考核指標(biāo)。電網(wǎng)不平衡主要由線路不換位和負(fù)載不平衡導(dǎo)致,故為了量化各個負(fù)荷單獨(dú)在電網(wǎng)公共連接點(diǎn)處引起的三相不平衡電壓大小,把線路和負(fù)載不平衡發(fā)射水平進(jìn)行分離。經(jīng)仿真發(fā)現(xiàn),公共連接點(diǎn)處的不平衡電壓主要由負(fù)載引起,故線路產(chǎn)生的不平衡電壓可以忽略。負(fù)載按線性和非線性可以分為線性負(fù)載和非線性負(fù)載,論文首先對線性負(fù)載的三相不平衡責(zé)任量化方法進(jìn)行研究,給出了IEC法、三相功率流動法、一致和非一致性電流法三種方法的理論框架,通過對比發(fā)現(xiàn)可以用一致和非一致性電流法定義負(fù)序電流責(zé)任,實(shí)施獎懲措施;接著論文研究了非線性負(fù)載的三相不平衡責(zé)任量化方法,論文給出了三相不平衡負(fù)序電壓責(zé)任的定義,其次,由于計(jì)算負(fù)序電壓責(zé)任的關(guān)鍵是準(zhǔn)確估算系統(tǒng)等效的負(fù)序阻抗,論文提出了復(fù)數(shù)域線性回歸的五點(diǎn)細(xì)分法,即以五個采樣數(shù)據(jù)為一組進(jìn)行復(fù)數(shù)域線性回歸,根據(jù)誤差限值篩選出各個分組中回歸的負(fù)序阻抗參數(shù),并求取平均值,進(jìn)而求得系統(tǒng)等效負(fù)序阻抗和背景負(fù)序電壓,仿真驗(yàn)證了此方法的可行性。
[Abstract]:With the development of economy and the emergence of various kinds of loads in the power network, the problem of three-phase imbalance is becoming more and more serious. The division of responsibility for three-phase unbalanced sources is helpful to improve the initiative of users to deal with the imbalance, and it is of great significance to improve the power quality. The voltage asymmetry at common connection points caused by three-phase unbalanced sources is one of the main power quality problems concerned by power supply departments, and the voltage (current) imbalance is taken as the index of power quality assessment. The imbalance of the power network is mainly caused by the line imbalance and the load imbalance. Therefore, in order to quantify the magnitude of the three-phase unbalanced voltage caused by each load alone at the common connection point of the power network, the transmission level of the line and the load imbalance is separated. It is found by simulation that the unbalanced voltage at the common connection point is mainly caused by the load, so the unbalanced voltage generated by the line can be neglected. The load can be divided into linear load and nonlinear load according to linear and nonlinear. Firstly, this paper studies the quantization method of three-phase unbalanced responsibility of linear load, and gives the IEC method and three-phase power flow method. The theoretical framework of the three methods of consistent and inconsistent current method is found to be able to define the responsibility of negative sequence current by consistent and inconsistent current method and to implement reward and punishment measures. Then the paper studies the quantization method of three-phase unbalance responsibility of nonlinear load, and gives the definition of three-phase unbalanced negative sequence voltage responsibility. Secondly, because the key to calculate the responsibility of negative sequence voltage is to accurately estimate the equivalent negative sequence impedance of the system. In this paper, a five-point subdivision method for linear regression in complex domain is proposed, in which five sampling data are taken as a group to carry out linear regression in complex domain. According to the error limit, the negative sequence impedance parameters of each group are selected, and the average value is obtained. The equivalent negative sequence impedance and background negative sequence voltage of the system are obtained, and the feasibility of the method is verified by simulation.
【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】：2017
【分類號】：TM711

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