A Three-Phase Power Flow Model for Low-Voltage Distribution Networks Considering Balanced Bus Phase Asymmetry and Photovoltaic Access

doi:10.11930/j.issn.1004-9649.202408058

Abstract

Abstract:

Considering the diverse connection modes and complex control strategies of photovoltaic (PV) inverter power sources integrated into low-voltage distribution networks, this paper delves into the establishment of a control model for the three-phase voltages and powers of PV inverter power sources relative to the neutral point. On this foundation, the paper further proposes a comprehensive low-voltage distribution network three-phase power flow calculation model that takes into account both the asymmetry of phase angles at balanced terminals and the factors involved in the integration of PV inverter power sources. To validate the effectiveness and accuracy of this model, simulation experiments were conducted on a modified IEEE-13 node test system. The simulation results clearly demonstrate that the model constructed in this paper can accurately and efficiently calculate the three-phase power flow in low-voltage distribution networks incorporating PV inverter power sources, providing robust theoretical support and technical means for the planning and operation of low-voltage distribution networks.

Key words: three phase four wire system, low voltage distribution network, photovoltaic inverter power supply, smart meter

Yang ZHOU, Dezhi HUANG, Peidong LI, Kailin JI, Xuefeng LIU, Hong TAN. A Three-Phase Power Flow Model for Low-Voltage Distribution Networks Considering Balanced Bus Phase Asymmetry and Photovoltaic Access[J]. Electric Power, 2024, 57(10): 190-198.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202408058

https://www.electricpower.com.cn/EN/Y2024/V57/I10/190

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References 33

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潮流结果	相别	方案1）	方案2）	方案3）	$ \delta_d^1 $	$ \delta_d^3 $
三相功率/ (MV·A)	A	1.0209+ j0.7029	1.0799+ j0.5748	1.0799+ j0.5748	–5.56%	0
	B	0.9464+ j0.6018	1.0134+ j0.7116	1.0134+ j0.7116	–6.61%	0
	C	1.2963+ j1.0521	1.1680+ j1.0629	1.1680+ j1.0629	10.96%	0
三相相角/(°)	A	0	0	0	—	—
	B	–120	–120	–120	—	—
	C	–240	–192	–192	—	—
收敛次数/次	—	5	6	8	—	—
计算时间/s	—	0.0405	0.0473	0.0715	—	—

潮流结果	相别	方案1）	方案2）	方案3）	$ \delta_d^1 $	$ \delta_d^3 $
三相功率/ (MV·A)	A	1.0209+ j0.7029	1.0799+ j0.5748	1.0799+ j0.5748	–5.56%	0
	B	0.9464+ j0.6018	1.0134+ j0.7116	1.0134+ j0.7116	–6.61%	0
	C	1.2963+ j1.0521	1.1680+ j1.0629	1.1680+ j1.0629	10.96%	0
三相相角/(°)	A	0	0	0	—	—
	B	–120	–120	–120	—	—
	C	–240	–192	–192	—	—
收敛次数/次	—	5	6	8	—	—
计算时间/s	—	0.0405	0.0473	0.0715	—	—

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