适应于可再生能源接入下配电网极限线损的计算方法

doi:10.12066/j.issn.1007-2861.2191

Abstract

Abstract:

With the advancement of renewable energy technology and increasing demand, the access of distributed generations introduces volatility and uncertainty to the power flow distribution within medium voltage distribution networks. Consequently, the volatile and uncertain nature significantly hinders the accurate line loss calculation and establishment of grid assessment indicators. This study proposes a semi-invariant calculation model that aids realize an efficient calculation approach for limit line loss of the distribution network containing renewable energy. Initially, according to the power flow calculation and statistical data, the semi-invariants of each node and generations in the distribution network are calculated. Next, the distribution function and probability density function of each state index are calculated with the Gram-Charlier (GC) series expansion formula. Finally, the limit line loss of the distribution network is determined according to the confidence interval. IEEE34 node system is chosen as an example in this study to analyse the influence of different node distributed power access on distribution network. The calculation accuracy of line loss calculation model based on semi-invariant method and its calculation speed advantage in large-scale distribution network application is verified.

Key words: distribution network, limit line loss, distributed power supply, semi-invariant model, stochastic load flow

CLC Number:

TM744

ZHU Yue, GU Jie, WANG Chunyi, MOU Hong, CUI Guozhu, LI Yu, JIN Zhijian. Calculation method of limit line loss of renewable energy distribution network[J]. Journal of Shanghai University（Natural Science Edition）, 2021, 27(5): 833-845.

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References 18

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Calculation method of limit line loss of renewable energy distribution network

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