基于DG和多端VSC协调控制的交直流配电网优化运行

分布式电源(DG)大规模并网不仅带来了消纳问题，还使交直流网络的经济安全运行面临巨大挑战。基于此，文中提出一种基于DG选址和多端电压源换流器(VSC)协调控制的交直流混合配电网优化运行方法。针对DG选址，基于灵敏度分析方法提出一种节点网损灵敏度指标，利用网络中不同位置的负荷节点对网损敏感度不同的规律进行交流网侧的DG选址。进而建立以网络有功总损耗、节点电压偏移量和DG盈余量最小为目标的多目标优化模型，对多端VSC不同控制策略下的端口功率电压变量和DG的有功出力进行协调控制。仿真结果表明，所提优化运行方法能够提高网络运行经济性和安全性，并兼顾配电网对DG的消纳水平，为实际工程中的决策人员提供重要的参考。

Optimal operation of AC/DC distribution network based on DG and multi-terminal VSC coordinated control

The large-scale grid connection of distributed generation (DG) not only brings the problem of consumption,but also poses great challenges to the economic and safe operation of the AC/DC network. Based on this,an optimal operation method for AC/DC hybrid distribution network based on DG location and coordinated control of multi-terminal voltage source converter (VSC) is proposed. For DG location,a node loss sensitivity index is proposed through the sensitivity analysis method. The DG location on the AC network side is carried out by using the law that load nodes at different locations have different sensitivities to network loss.Then,a multi-objective optimization model aiming at minimizing network active total loss,node voltage deviation and DG surplus is established to coordinate the active power output of DG and the port power and voltage variables under different control modes of multi-terminal VSC. The simulation results show that the proposed optimal operation method can improve the economy and security of network operation while taking into account the DG consumption level of distribution network,and provides an important reference for decision-makers in practical engineering.