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自适应Levenberg-Marquardt方法提高潮流计算收敛性

DOI: 10.13334/j.0258-8013.pcsee.2015.08.010, PP. 1909-1918

Keywords: 自适应LM方法,潮流计算,病态潮流,自适应阻尼因子,稀疏技术

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Abstract:

Levenberg-Marquardt(LM)方法是一种求解病态非线性方程组的数值算法。LM方法的性能取决于阻尼因子的选取及更新策略。提出一种带自适应阻尼因子的LM方法来提高潮流计算的收敛性。针对电力系统良态潮流、病态潮流和潮流无解等3种情况,详细分析所提方法提高潮流计算收敛性的原因和机理。针对自适应LM迭代步中求逆矩阵的特殊结构,提出一种自适应LM迭代步的稀疏实现方法。对4个实际系统(含国网21479节点系统)和1个IEEE300节点标准系统进行仿真计算后结果表明:自适应LM方法能够得到良态或病态潮流的精确解以及潮流无解时的最小二乘解,因此具有很强的适应能力。在病态或无解的情况下,所提方法得到的计算结果可为后续的潮流调整提供有效依据。

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