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arXiv 2201.12571eess.SYcs.SYmath.PR
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基于累积量法的AC/DC混杂系统概率潮流计算

Probabilistic load flow calculation of AC/DC hybrid system based on cumulant method

Yinfeng Sun, Dapeng Xia, Zichun Gao, Zhenhao Wang, Guoqing Li, Weihua Lu, Xueguang Wu, Yang Li

摘要:

电力系统的运行工况变得更加复杂多变。针对含有光伏并网系统的电压源换流器-高压直流(VSC-HVDC)混杂系统,提出了一种基于累积量法的概率潮流算法(PLF-CM)。首先,为变换器设置相应的控制模式,包括下垂控制和主从控制。采用统一迭代法计算常规交直流潮流。其次,在负荷和光伏出力概率模型的基础上,基于上述潮流计算结果,利用本文的相关系数矩阵将相关样本转化为独立样本,得到负荷和光伏出力的累积量;然后,在步骤S102,利用Gram-2方法得到了状态变量的概率密度函数和累积分布函数。查理级数展开法最后,在改进的IEEE 34节点和IEEE 57节点输电系统上计算了节点电压和线路功率的均值和标准差。该算法能够反映新能源固有的不确定性,并取代复杂的卷积运算,大大提高了计算速度和收敛性。

英文摘要:

The operating conditions of the power system have become more complex and changeable. This paper proposes a probabilistic load flow based on the cumulant method (PLF-CM) for the voltage sourced converter high voltage direct current (VSC-HVDC) hybrid system containing photovoltaic grid-connected systems. Firstly, the corresponding control mode is set for the converter, including droop control and master-slave control. The unified iterative method is used to calculate the conventional AC/DC flow. Secondly, on the basis of the probability model of load and photovoltaic output, based on the aforementioned flow results, use correlation coefficient matrix of this paper will change the relevant sample into independent sample, the cumulants of the load and photovoltaic output are obtained; then, the probability density function (PDF) and cumulative distribution function (CDF) of state variables are obtained by using Gram-Charlie series expansion method. Finally, the mean value and standard deviation of node voltage and line power are calculated on the modified IEEE 34-bus and IEEE 57-bus transmission systems. The algorithm can reflect the inherent uncertainty of new energy sources, and replace the complex convolution operation, greatly improving the calculation speed and the convergence.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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