Multi-layer power system tearing methodology for EMT-TS hybrid parallel simulation

• Main Authors: Qing Mu, Xing Zhang, Chunming Gong, Yu Chen
• Format: Article
• Language: English
• Published: Wiley 2019-04-01
• Series: The Journal of Engineering
• Subjects: power grids; power system transients; HVDC power transmission; EMTP; EMT-TS hybrid parallel simulation; power transferring; West China; East China; multiple-coupled HVDCs; EMT programmes; simulation accuracy; power system operation; EMT-TS hybrid simulation speed; TS network; network islands; EMT-ST sub-network groups; parallel programme structure; multilayer power system; power system tearing technology; UHVDC
• Online Access: https://digital-library.theiet.org/content/journals/10.1049/joe.2018.8836

Due to the fast development of UHVDC, the power transferring through HVDCs takes a great part of the power from West China to East China. The response for multiple-coupled HVDCs can only be simulated through EMT programmes. To increase the simulation accuracy, the EMT-TS Hybrid simulation has been used in studies of the power system operation. Currently, the EMT-TS hybrid simulation speed is too slow to be unaffordable. This paper presents a novel power system tearing technology to greatly improve the simulation speed in EMT-ST Hybrid Simulation. The TS network is teared according to obtain network islands as many as possible, while the EMT network is teared through the combined transmission line and electric nodes. An algorithm is supposed to form the EMT-ST sub-network groups, which has no coupling with each other. Then, a novel parallel programme structure is proposed to use this EMT-ST sub-network groups to realise the parallel simulation and speedup the simulation. The case studies of the grids with seven HVDCs and 3000 nodes show that the proposed method could greatly improve the simulation speed without lowering precision.