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On Computation and Implementation Techniques for Fast and Parallel Electromagnetic Transient Power System Simulation

  • Author / Creator
    Duan, Tong
  • Electromagnetic transient (EMT) simulation is a paramount tool to study the electrical system's behavior and reproduce the transient waveforms prior to manufacturing and deployment. However, the simulation process slows down significantly when the circuit scale expands, and thus the fast and parallel circuit simulation techniques are required to be studied and applied, especially for modern large-scale AC/DC grids where the MMC converters composed of hundreds of submodules generate a large matrix. Besides, the traditional power system is evolving into a complex cyber-physical system (CPS), which also proposes a new challenge to simulate the entire behavior of the system for quickly and adequately evaluating the interplay between digital world and physical appliance.

    To conduct fast EMT simulation for large and complex power systems, in this thesis, the existing computation and implementation techniques are investigated and improved, including the the multi-rate (MR) scheme, variable time-stepping (VTS) scheme, domain decomposition (DD) scheme, and hardware based acceleration. 1) For the MR scheme, an extended multi-rate mixed-solver (MRMS) hardware architecture is proposed for real-time EMT emulation of hybrid AC/DC networks, which is an implementation-level work taking advantages of the hybrid FPGA-MPSoC platform to emulate AC/DC systems in real-time while guaranteeing the accuracy and low resource cost. 2) For the VTS scheme, the new mathematical computational processes for the universal line model (ULM) and universal machine (UM) model are proposed, which greatly improve the stability of the models when the time-step changes compared to the traditional ULM and UM model. The faster-than-real-time emulation architecture on FPGA and 4-level parallelism architecture on GPU are also proposed to conduct the VTS-based EMT simulation in parallel. 3) For the DD scheme, a novel linking-domain extraction (LDE) decomposition method is proposed, which is a matrix-based decomposition method and can obtain the general formulation of the inverse of the circuit conductance matrix based on the mathematical analysis. Using the LDE method, a circuit can be simulated in parallel for the decomposed subsystems. To fully exploit the potential of the LDE method, the hierarchical LDE decomposition method is also proposed for further applications. 4) In addition, by leveraging the fast and parallel computing capabilities of FPGA/MPSoC/GPU hardware platforms, the real-time co-emulation hardware architectures of EMT-based power system and communication network are proposed on both the FPGA-MPSoC and Jetson-FPGA platforms to accelerate the co-simulation process for AC/DC cyber-physical power systems and study the communication-enabled global control schemes.

    Although the proposed methods belong to different computation and implementation techniques, the essential goal of those works is the same: conducting fast and parallel EMT simulation to deal with the complexity of large-scale power systems and to significantly accelerate the simulation process. The proposed mathematical models, computational approaches, and implementation architectures contribute to the exiting EMT simulation techniques and have potential to be applied in the future EMT simulation research.

  • Subjects / Keywords
  • Graduation date
    Spring 2021
  • Type of Item
    Thesis
  • Degree
    Doctor of Philosophy
  • DOI
    https://doi.org/10.7939/r3-9q1a-ak65
  • License
    This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.