基于电压源换流器（voltage source converters，VSCs）的直流配电网可以自动调整过载VSC的控制策略以适应可再生能源功率的变化，但增加了直流配电网稳态潮流分析的难度。 因此，提出了一种分段线性潮流（piecewise linear power flow，PLPF）算法以快速计算功率扰动和VSC控制策略调整对稳态潮流的耦合影响。首先，根据VSC功率平衡，直接计算得到VSC达到容量极限的临界点，进而计算得到VSC控制策略调整前各节点的功率变化量。然后，考虑VSC控制策略调整，对线性潮流模型进行修正。最后，对VSC控制策略调整前后各个阶段进行线性潮流计算，利用叠加法得到稳态潮流。仿真结果表明，所提出的PLPF模型能直接快速准确地计算出直流配电网稳态潮流分布。

Voltage source converters (VSCs)-based DC distribution networks (DCDNs) can automatically adjust the control strategy of overloaded VSC to adapt to the variation of renewable energy power, but it brings difficulties to analyze the steady-state performance of DCDNs. A piecewise linear power flow (PLPF) algorithm is proposed to quickly calculate the coupled effect of the power disturbance and VSC control strategy adjustment on steady-state power flow. Firstly, according to the VSC power balance, the critical point of VSC hitting the capacity limit is directly determined and the power variations of each node before VSC control strategy adjustment are obtained. Then, the linear power flow is revised considering the VSC control strategy adjustment. Finally, the linear power flow calculation is performed in each stage before VSC control strategy adjustment, and the steady-state power flow is obtained by using the superposition method. Simulation results show that the proposed PLPF model can directly, quickly, and accurately calculate the steady-state power flow distribution of DCDNs.