Piecewise Linear Power Flow Algorithm of DC Distribution Networks Considering Automatic Adjustment of VSC Control Strategy

Ruixiong Yang, Yizhen Wang (), Songtao Yu (), Yong Chen and Xu Cheng
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Ruixiong Yang: DC Power Distribution and Consumption Technology Research Center, Guangdong Power Grid, Zhuhai 519099, China
Yizhen Wang: Key Laboratory of the Ministry of Education on Smart Power Grids, Tianjin University, Tianjin 300072, China
Songtao Yu: State Key Laboratory of HVDC, Electric Power Research Institute, China Southern Power Grid Company Limited (CSG), Guangzhou 510663, China
Yong Chen: DC Power Distribution and Consumption Technology Research Center, Guangdong Power Grid, Zhuhai 519099, China
Xu Cheng: DC Power Distribution and Consumption Technology Research Center, Guangdong Power Grid, Zhuhai 519099, China

Energies, 2023, vol. 17, issue 1, 1-16

Abstract: Voltage source converter (VSC)-based DC distribution networks (DCDNs) can automatically adjust the control strategy of overloaded VSCs to adapt to the variation in renewable energy power, but it brings difficulties to the steady-state performance analysis of DCDNs. This paper presents a piecewise linear power flow (PLPF) algorithm to estimate the joint effect of power disturbance and VSC control strategy adjustment on steady-state performance. Firstly, according to the VSC power balance, the critical point of the VSC hitting the capacity limit is directly determined, and the power variations in each node before VSC control strategy adjustment are obtained. Then, the linear power flow is revised considering the VSC control strategy adjustment. Inversion of the block Jacobian matrix is used to improve the calculation speed of linear power flow revision. Finally, linear power flow calculation is performed in each stage, and the steady-state performance is obtained by using the superposition method. Simulation results show that the proposed PLPF model can estimate the steady-state performance faster and more simply.

Keywords: DC distribution network; droop control; linear power flow model; piecewise model (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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