Master-Slave Splitting Algorithm of Global Dynamic Power Flow for Transmission and Distribution Networks with Electromagnetic Loop Networks

When calculating the post-contingency steady-state power flow of the whole transmission and distribution networks, the global dynamic power flow is closer to the actual situation than the conventional dynamic power flow computed only in the transmission networks. To solve the distributed computation problem of global dynamic power flow, the master-slave splitting algorithm is adopted. Firstly, the transmission network and the distribution networks are split based on the equivalence of distribution network. Secondly, the dynamic power flows are separately calculated in the transmission and distribution networks. Thirdly, the master-slave iterations are realized by interchanging a small amount of data between networks. According to the electromagnetic loop network theory, a starting speed-up section is designed at the first master-slave iteration in order to achieve a more precise system frequency increment at the very beginning of iterations, which will speed up the calculation. Numerical tests validate that the master-slave splitting algorithm with the starting speed-up section for global dynamic power flow has an accurate and fast capability in calculating the post-contingency power flow, and is suitable for distributed computation between transmission and distribution networks. © 2019 Automation of Electric Power Systems Press.