This paper proposed a probabilistic load flow technique of AC/VSC-MTDC (Alternate\nCurrent/Voltage Source Control-Multiple Terminal Direct Current) hybrid grids based on an\nimproved stochastic response surface method. The applied traditional stochastic response surface\nmethod is inherent with the capability to tackle correlated normal variables; however, the accuracy\nis poor in the case of correlated diverse distributions. To address this issue, NATAF transformation\nwas adopted to transform the correlated wind speeds and loads following arbitrary distributions\ninto the variables that are subject to standard normal distributions. The collection points could be\nselected to establish the polynomial relationship among the independent standard normal variables\nand the output responses. Then, the probability distributions and statistics of the responses could\nbe accurately and efficiently estimated. The modified IEEE 14-bus system, involving an additional\nVSC-MTDC system, wind speeds following various distributions, and diverse consumer behaviors,\nwas used to demonstrate the validity and capability of the proposed method.
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