Three-Point Estimation Probability Power Flow Calculation Method for DC Distribution Network

Lin E; Zhen MA; Yu XIAO; Yongqiang ZHU

doi:10.16513/j.2096-2185.DE.2106507

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Distributed Energy ›› 2021, Vol. 6 ›› Issue (3) : 38-46. DOI: 10.16513/j.2096-2185.DE.2106507

Basic Research

Three-Point Estimation Probability Power Flow Calculation Method for DC Distribution Network

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Abstract

With the development of distributed power sources based on wind power and photovoltaics and the increase of DC loads, DC power grids have attracted more and more attention. Compared with the AC distribution network, the DC distribution network can save a lot of commutation links, reduce losses and improve economic benefits while consuming a large amount of renewable energy and DC loads. This paper combined the probabilistic power flow calculation method based on the three-point estimation method and Nataf inverse transform for AC power grids with the DC power flow model, and proposed a method suitable for the probabilistic power flow calculation of the DC distribution network with multiple distributed power sources. Comparing the method in this paper with the Monte Carlo method, when the new energy capacity increases, the calculation error of the three-point estimation method is similar to that of Monte Carlo, and the calculation speed is increased; at the same time, the DC power flow calculation and AC power flow calculation using the three-point estimation will be used. In contrast, when applied to the DC system, the error tends to be smaller than that of the AC system, which illustrates the accuracy and effectiveness of the proposed calculation method.

Key words

DC distribution network / distributed power generation / probabilistic power flow / three-point estimation method

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Lin E , Zhen MA , Yu XIAO , et al. Three-Point Estimation Probability Power Flow Calculation Method for DC Distribution Network[J]. Distributed Energy Resources. 2021, 6(3): 38-46 https://doi.org/10.16513/j.2096-2185.DE.2106507

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