计及不同主体的含PET交直流混合微网双层优化调度

Two-layer Optimal Dispatching for AC/DC Hybrid Microgrid with PET Considering Different Subjects

交直流混合微网是电力电子变压器的重要应用场景。本文将电力电子变压器应用于交直流混合微网,提出一种计及不同主体的含电力电子变压器交直流混合微网双层优化调度方法。首先,针对混合微网中的交直流子微网以及电力电子变压器分别进行建模;然后,将电力电子变压器不同端口设定为不同主体,构建交直流混合微网的双层优化模型,兼顾电力电子变压器与交直流微网各自的经济性运行目标,优化上层的电力电子变压器和下层的交直流子微网,通过Karush-Kuhn-Tucker方法将双层优化模型等效转化为单层模型进行求解。最后,采用所提方法分别对计及电力电子变压器与计及AC/DC变换器的交直流混合微网进行优化与对比分析。

The AC/DC hybrid microgrid is an important application scenario of power electronic transformers(PETs).In this paper,the PET is applied to an AC/DC hybrid microgrid,and a two-layer optimal dispatching method is proposed for the AC/DC hybrid microgrid with PET considering different subjects. First,the AC/DC sub-microgrid and PET in the hybrid microgrid are modeled,respectively. Second,a two-layer optimization model of the AC/DC hybrid microgrid is constructed by setting different terminals of the PET as different subjects. In addition,the PET in the upper layer and the AC/DC sub-microgrid in the lower layer are optimized while taking into account the respective economic operation goal of the PET and AC/DC microgrid,and the Karush-Kuhn-Tucker(KKT)method is used to equivalently convert the two-layer optimization model into a single-layer model for finding a solution. Finally,the proposed method is used to optimize and compare the AC/DC hybrid microgrids with a PET and an AC/DC converter,respectively.