Real-Time Electromagnetic Transient Hardware Emulation of Multi-Terminal High Voltage DC Grid

• Author / Creator

  Shen, Zhuoxuan

• New high voltage DC (HVDC) transmission projects are being increasingly operated globally, which can be developed into multi-terminal DC (MTDC) grid interconnecting the conventional AC grid and the off-shore renewable energy power plants. Among various power converter topologies, modular multi-level converter (MMC) has the features of providing very low harmonics and low switching frequency, which is specifically focused on in this work. Real-time electromagnetic transient (EMT) simulation is a powerful tool for the transient study and analysis of the DC grid, and for the design and verification of the control and protection systems. Field Programmable Gate Arrays (FPGAs) and Multi-Processor System-on-Chip (MPSoC) devices, which have highly parallel hardware architectures, are used for the real-time emulation systems developed in this work.
  This thesis focuses on the off-line and real-time simulation of the multi-terminal high voltage DC grid, and contributes on the aspects of EMT simulation technique, MMC modeling scheme, DC grid modeling scheme, and hardware implementation method. Variable time-stepping schemes combined with nonlinear element solution schemes have been applied to FPGA-based real-time simulation of power electronics circuit and power system circuit for the first time. This work proposes the datasheet based device-level electrothermal model for the MMC containing half-bridge sub-module (HBSM) and clamp double sub-module (CDSM). Such a model can increase the simulation accuracy and provide the detailed device-level thermal data and switching transient waveforms for the efficiency and safety evaluation of the control and protection scheme during normal operation and contingency. The comprehensive simulation of the AC/DC grid, which is composed of CIGRE DC grid test system, IEEE 39-bus AC system and the wind farms is presented with hybrid modeling scheme. Finally, the thesis develops and presents the detailed implementation of real-time emulation of the CIGRE DC grid test system for the hardware-in-the-loop (HIL) test on MPSoC-FPGA platform.

• Subjects / Keywords

  • DC grid
  • FPGA
  • Real-time simulation
  • Electromagnetic transient
  • Power system
  • Electrothermal model

• Graduation date

  Fall 2018

• Type of Item

  Thesis

• Degree

  Doctor of Philosophy

• DOI

  https://doi.org/10.7939/R3BG2HS3H

• License

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