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计及VSC-HVDC的交直流系统最优潮流统一混合算法

DOI: 10.13334/j.0258-8013.pcsee.2014.04.016, PP. 635-643

Keywords: 电压源换流器,高压直流输电,交直流系统,最优潮流,统一混合算法,原对偶内点法,差分进化算法

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Abstract:

进化类算法和内点法交替迭代的混合算法在求解含电压源换流器的高压直流输电(voltagesourceconverterbasedhighvoltagedirectcurrent,VSC-HVDC)的交直流系统最优潮流(optimalpowerflow,OPF)问题时由于截断误差的影响和VSC-HVDC控制方式的限制,容易发生振荡,因此提出一种基于差分进化(differentialevolution,DE)和原—对偶内点法(primal-dualinteriorpointmethod,PDIPM)的统一混合迭代算法。算法的主要思想是以DE算法为框架,对离散变量进行优化,在DE算法的每一次迭代过程中,采用PDIPM对每个DE个体进行连续变量的优化和适应度评估。由于采用PDIPM进行DE种群适应度评估,无需设定VSC-HVDC的控制方式,因此提高了算法的全局寻优能力。多个算例结果表明,该混合算法数值稳定性高,寻优能力强,能很好地解决含两端、多端、多馈入VSC-HVDC的交直流系统最优潮流问题。

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