应用改进序分量法的主动配电网不平衡潮流计算

Calculation of Unbalanced Power Flow in Active Distribution Networks Based on Improved Sequence Components

为适应主动配电网快速仿真计算的要求,提出一种基于序分量法的三相不平衡潮流的并行计算方法。该方法首先基于补偿法建立主动配电网中各元件序分量模型:针对各种分布式电源(distributed generation,DG),分别建立PQ、PV不同类型节点的序分量模型;针对非全相线路,提出基于虚拟线路法的一体化序分量建模方法,简化了对非全相线路的处理;针对不平衡负荷,计及了其在实际配网中类型和接线方式,推导其序分量模型,提高了计算的精确性。然后将不平衡配网分解为无耦合关系的正、负、零3个序分量网络和补偿注入元,3个序网络采用并行计算,从而降低了计算规模,节省了存储空间,大大提高了计算速度。最后通过算例验证该算法的准确性和快速性。

In order to meet the requirements of fast simulation in active distribution networks（ADN）. A improved sequence components method is proposed that can be efficiently applied to parallel computing of three-phase unbalanced power flow in ADN. Firstly, the paper builds sequence components models of ADN components based on compensation method： A variety of distributed generation（DG） sequence components are established that can cope with different types of nodes as PQ or PV. And adds virtual line to simplify sequence components of the open phase, it can build unified sequence components models for entire distribution networks lines. To accurate calculation power flow in distribution networks, the paper builds sequence components models of different connection loads. Secondly, unbalanced distribution networks is decomposed into three sequence networks and compensation parts. Parallel computing can be used for three decoupled networks, it reduces the computational scale, saves storage space, and greatly improves the computing speed. Finally, the simulation results of test examples are provided to demonstrate the correctness and effectiveness of the proposed method.