Affine Power Flow Calculation Method for Low-voltage Distribution Systems Considering the Uncertainty of Distributed Photovoltaic Output

doi:10.11930/j.issn.1004-9649.202412047

Abstract

Abstract:

The uncertainty of the source and load increases the difficulty of real-time situation awareness of the distribution network. To this end, an affine power flow calculation for the low-voltage distribution network considering the uncertainty of distributed photovoltaic output is proposed. The power flow model of the low-voltage distribution network is established considering uncertainty of photovoltaic output and load. The influence of the neutral point voltage on the power flow calculation results is considered, and the affine expression of the distribution network state is established, thereby reducing the expansion effect of the interval operation and obtaining a more compact interval of the state variables. Based on the standard distribution network test system, the proposed method is. The simulation results show that the proposed method can not only improve the calculation accuracy but also give more valuable evaluation results in the analysis of power quality.

Key words: distributed photovoltaic, uncertainty, distribution systems, interval power flow

WANG Zezhou, MAO Linming, PAN Keqin, CHU Jianxin, CHEN Gang. Affine Power Flow Calculation Method for Low-voltage Distribution Systems Considering the Uncertainty of Distributed Photovoltaic Output[J]. Electric Power, 2025, 58(10): 188-194.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202412047

https://www.electricpower.com.cn/EN/Y2025/V58/I10/188

Figures/Tables 7

Fig.1 Flow chart of the proposed affine power flow calculation method of distribution systems

Fig.2 The single line diagram of the 34 bus distribution system

Fig.3 Ranges of three-phase voltage magnitudes calculated by the four methods

Table 1 Conservative index and simulation time of different methods

方法	C_pv	C_pθ	时间/s
IA	51.31	30.14	30
AA	58.97	32.83	36
IM	76.01	60.18	44

Fig.4 Voltage magnitude ranges of phase a of bus 34 under different power disturbance ranges

Fig.5 Voltage magnitude ranges of phase b of bus 34 under different power disturbance ranges

Fig.6 Voltage magnitude ranges of phase c of bus 34 under different power disturbance ranges

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