中文摘要：

多端柔性直流输电系统是近年来的研究热点,而关于其潮流计算的研究是系统稳定控制和故障分析的基础,迄今为止,已有很多文献对此做了研究,但从其使用的求解潮流的数学模型方面看,都是基于节点功率关系的。提出了一种基于节点电流关系的多端柔性直流网络潮流算法,且考虑了下垂控制方式,以6节点直流网络和11节点交直流混联网络为例,在Matlab中编制了相应的程序,并与现有文献中的基于节点功率关系的潮流算法做了对比。对比结果显示,在不同的网络运行方式下达到相同的预定计算精度时,均比基于节点功率关系的潮流算法迭代次数少,所用时间短且当节点电压初值发生一系列变化时,所提算法依然可以快速求解出收敛解,而基于节点功率关系的算法,对于电压初值变化很敏感,迭代次数随初值的变化而变化。算例结果表明,所提算法对含有多端柔性直流系统的网络潮流计算具有较好的快速性和计算精度。

英文摘要：

Multi-terminal VSC-HVDC（voltage source converter-high voltage direct current） system is research hotspot in recent years.Its power flow calculation is basis of system stability control and fault analysis.Many references have performed researches on this topic.In term of mathematical model of power flow calculation,most references are based on nodal power relations.Power flow calculation model based on nodal current relation is proposed in this paper and voltage droop control is considered.A 6-node DC network and an 11- node AC-DC hybrid network are taken as examples and power flow calculation codes are compiled in MATLAB.Compared with power flow calculation results based on nodal power relation,the proposed method is easier to realize and needs less iterations in various operation modes with higher accuracy.When initial node voltage value changes,the proposed algorithm is insensitive to the change.However,algorithm based on nodal power relation is sensitive to the change.Therefore,the proposed algorithm is more suitable to power flow calculation of multi-terminal DC network.