基于配變等效電路參數(shù)模型的三相負(fù)荷不平衡分析
羅異
(國(guó)網(wǎng)四川省電力公司廣漢市供電分公司,四川 廣漢 618300)
摘 要:基于配電變壓器T形等效電路推導(dǎo)得到其電路參數(shù)標(biāo)幺值計(jì)算公式,通過(guò)在MATLAB/SIMULINK仿真平臺(tái)建立配電變壓器仿真模型驗(yàn)證了理論公式的精確性。建立簡(jiǎn)單配電變壓器臺(tái)區(qū)仿真模型,得到部分常用配電變壓器最佳負(fù)載率以作為選擇配電變壓器容量的參考,并定義三相負(fù)荷不平衡主要評(píng)估參數(shù),通過(guò)仿真量化從三相負(fù)荷分配不均及功率因數(shù)差異大這兩個(gè)角度分析了三相負(fù)荷不平衡的危害,為治理三相負(fù)荷不平衡問(wèn)題提供了參考。
關(guān)鍵詞:配電變壓器;T形等效電路;標(biāo)幺值參數(shù);三相負(fù)荷不平衡;MATLAB/SIMULINK 仿真
中圖分類號(hào):TM714 文獻(xiàn)標(biāo)識(shí)碼:A 文章編號(hào):1007-3175(2018)03-0037-06
Three Phase Load Unbalance Analysis Based on Distribution Transformer Equivalent Circuit Parametric Model
LUO Yi
(State Grid Sichuan Electric Power Company Guanghan Power Supply Company, Guanghan 618300, China)
Abstract: Based on the T-type equivalent circuit of distribution transformer, this paper derived the formulas to calculate the per-unit parameters of T-type equivalent circuit. The simulation model for distribution transformer was built in MATLAB/SIMULINK environment, which proved the precision of these formulas. A simple simulation model of single distribution transformer courts was built to obtain the best load factor for different transformers, which can provide help for choosing the appropriate capacity and define the main evaluation parameters of three phase load unbalance. The impact of three phase load unbalance were analyzed in quantization way for two conditions, the unbalance load distribution and the power factor difference, which provides references for solving three phase load unbalance problems.
Key words: distribution transformer; T-type equivalent circuit; per-unit parameter; three phase load unbalance; MATLAB/SIMULINK simulation
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