本文選題：三相三線制電路 + 不平衡負(fù)荷　； 參考：《中國電機(jī)工程學(xué)報》2017年19期

【摘要】：補(bǔ)償負(fù)荷不平衡時,通常以理想三相電壓源電勢作為公共連接點(diǎn)(point of common coupling,PCC)參考電壓,實(shí)際系統(tǒng)中據(jù)此設(shè)計(jì)的補(bǔ)償網(wǎng)絡(luò)并不能完全平衡。對此,針對負(fù)荷不平衡的三相三線制電路,為更符合PCC處三相電壓不對稱的實(shí)際情形,該文考慮系統(tǒng)導(dǎo)納,將系統(tǒng)側(cè)等效為戴維南模型后,建立了不平衡負(fù)荷的負(fù)序加權(quán)等效模型;基于等效負(fù)荷參數(shù),運(yùn)用Steinmetz平衡化理論給出了相間補(bǔ)償網(wǎng)絡(luò)電納的負(fù)序加權(quán)計(jì)算公式。網(wǎng)絡(luò)參數(shù)是以加權(quán)系數(shù)為變量的函數(shù),可兼容已有的針對三相三線制電路設(shè)計(jì)的平衡化補(bǔ)償網(wǎng)絡(luò)方法,為補(bǔ)償?shù)膬?yōu)化提供了理論基礎(chǔ)。結(jié)合具體算例,該文給出了負(fù)序加權(quán)系數(shù)和補(bǔ)償容量的三維關(guān)系圖,以補(bǔ)償容量最小為目標(biāo),確定出平衡化補(bǔ)償?shù)淖顑?yōu)方案,仿真與物理實(shí)驗(yàn)驗(yàn)證了所提模型和平衡化方法的正確性。
[Abstract]:When the compensation load is unbalanced, the ideal three-phase voltage source potential is usually used as the common connection point of the reference voltage of the common coupling PCCs, and the compensation network can not be completely balanced in the actual system. In this paper, aiming at the three-phase three-wire circuit with unbalanced load, in order to meet the actual situation of three-phase voltage asymmetry at PCC, the system admittance is considered and the system side is equivalent to Thevenin model. The negative sequence weighted equivalent model of unbalanced load is established, and based on the equivalent load parameters, the formula of negative sequence weighted calculation for the electrical admittance of interphase compensation network is given by using the Steinmetz equilibrium theory. The network parameters are functions with weighted coefficients as variables, which can be compatible with the existing balanced compensation network methods designed for three-phase three-wire circuits, which provides a theoretical basis for the optimization of compensation. In this paper, a three-dimensional relationship diagram of negative sequence weighting coefficient and compensation capacity is given, and the optimal scheme of balancing compensation is determined by taking the minimum compensation capacity as the goal. Simulation and physical experiments verify the correctness of the proposed model and the balance method.
【作者單位】： 新能源電力系統(tǒng)重點(diǎn)國家實(shí)驗(yàn)室(華北電力大學(xué));
【基金】：國家自然科學(xué)基金青年基金項(xiàng)目(51207051)~~
【分類號】：TM714.3

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