配电系统中DFACTS设备运行交互影响研究

摘要

The distribution flexible AC transmission system ( DFACTS) technology is an economic and effective meth-od to improve the power quality, and the interactions among the DFACTS controllers should be considered. The line-arized model of a single-load infinite-bus distribution system installed with a distribution static var compensator ( DS-VC) and a distribution static synchronous compensator ( DSTATCOM ) is established, based on which the system transfer function can be obtained. Then, the interactions under different electrical parameters are analyzed based on the joint use of the relative gain matrix ( RGA ) and Niederlinski 's Index ( NI ) . The calculation results of the RGA main diagonal elements of the proposed model are close to one with electrical distance 0 . 5 and greater than 1 . 5 with electrical distance 0 . 1 , which means the interactions will be enhanced when the electrical distances are decreased and vice versa. The simulation results verify the effectiveness of the proposed model.%DFACTS技术是改善配电系统电能质量的一种经济、有效的手段,多个DFACTS控制器间的交互影响问题将不容忽视。本文针对配电系统中多个DFACTS控制器交互影响问题,以含配电系统静止无功补偿器( DS-VC)和静止同步补偿器( DSTATCOM)的简单配电系统为研究对象,建立了含DSVC和DSTATCOM的单负荷无穷大配电系统线性化模型,在此模型的基础上推导得出系统传递函数,并基于相对增益矩阵( RGA)和NI相结合的交互影响分析方法,在不同电气参数下进行了交互影响分析。对所建模型进行了RGA和NI计算,得到了当DFACTS控制器间电气距离为0.5时RGA主对角素元接近1,而当电气距离为0.1时RGA主对角元素却大于1.5的结果,进而得到DFACTS控制器间的交互影响随电气距离的减小而增大的结论。时域仿真验证了基于RGA和NI相结合的方法分析所得的结论,表明了所建线性化模型及该分析方法的正确性和有效性。