直流配电网潮流算法与电压分布研究

为解决间歇分布式能源入网等问题,国内外建设直流电网的呼声高涨。与高压直流电网相比,建设直流配电网的电力电子技术相对成熟,技术经济性好,应时开展直流配电网理论研究具有重要意义。针对直流配电网潮流计算,构建了网状结构直流配电网等值网络和节点功率、节点电压、线路网损模型,提出了直流配电网潮流计算的约束条件、控制策略和稳态功率、电压分布算法。最后,利用IEEE 16节点算例对模型和算法进行了验证,证明了电压分布均衡性对网损的影响较大、网状电网接纳分布式电源的能力较强。

Research on Power Flow Calculation and Voltage Profile in DC Distribution Network

Direct current (DC) networks have been recognized as a solution to the integration of intermittent distributed energy resources (DERs) into power systems. This necessitates the theoretical study on DC distribution networks, which can be built with more proven technology of power electronics and deliver better techno-economics than high-voltage direct current networks. Therefore, this paper is aimed at researching the steady-state operational characteristics of DC distribution networks by: a) providing an equivalent model of DC distribution network with meshed topology; and b) setting the constraints, control policy, steady-state power and voltage profile algorithms for the calculation. The models and the algorithms are verified with an IEEE 16-bus test system, proving that power loss is significantly impacted by the balance of voltage profile and that meshed networks are well positioned to accommodate DERs.