Experience

RTDS Technologies Inc.

• Canada
• Appliances, Electrical, and Electronics Manufacturing
• 1 - 100 Employee

• R&D Supervisor, Simulation and Analytical Studies

  • Sep 2018 - Present

  Manitoba, Canada

• Simulation Specialist

  • Oct 2014 - Present



University of Manitoba

• Canada
• Higher Education
• 700 & Above Employee

• POSTDOC Fellow

  • Jul 2012 - Oct 2014

  Winnipeg, Canada Area Parallel EMT Algorithm Development:  By using METIS package, the graph associated with the system admittance matrix was partitioned into subgraphs with consideration of the load balance for solver.  The system admittance matrix was reordered into a bordered block diagonal (BBD) matrix form.  Two particularly single bordered block LU triangular matrices were used for parallel solver implementation.  Interpolation algorithm was explained from a new point of view (NOS &… Show more Parallel EMT Algorithm Development:  By using METIS package, the graph associated with the system admittance matrix was partitioned into subgraphs with consideration of the load balance for solver.  The system admittance matrix was reordered into a bordered block diagonal (BBD) matrix form.  Two particularly single bordered block LU triangular matrices were used for parallel solver implementation.  Interpolation algorithm was explained from a new point of view (NOS & CDA).  Higher speedup was achieved compared with the serial program.  Power electronic models were developed.  Enhanced high-speed EMT MMC model with new sorting algorithm was developed.  Transformer, transmission line, machine and load models were implemented.  Control system models were implemented. MMC Modeling:  An improved sorting method for the capacitor voltage balance (NLC) was proposed.  The proposed model can be used with any internal MMC control algorithm such as the CPS-SPWM.  Blocking mode of MMC converter was implemented.  The proposed model is between 3 to 4 orders of magnitude faster than the full detailed model and is even between 1 to 2 orders of magnitude faster than the fast algorithms proposed earlier.  The proposed model is an ideal model for use in the simulation of large HVDC grids with multiple converters. Small Signal Analysis of VSC-HVDC System:  A linearized state-space VSC model was developed and validated using detailed electromagnetic transients simulation.  The gains of the PLL, particularly at low SCRs, greatly affect the operation of the VSC-HVDC converter and that operation at low SCRs approaching 1.3 (assuming an impedance angle of 80°) is very difficult.  For stronger ac networks (e.g. SCR = 1.6), the VSC system works well as long as the PLL gain is kept sufficiently large to provide an adequate damping coefficient. Show less



China Electric Power Research Institue

• Appliances, Electrical, and Electronics Manufacturing
• 1 - 100 Employee

• R&D Engineer

  • Jun 2010 - Jun 2012

  Beijing City, China Shifted Frequency Adaptive EMT Simulation :  A novel frequency-adaptive methodology with new time domain transformation is proposed.  The component models were obtained by discretizing the differential equations at the branch level which are convenient for EMTP implementation.  Larger time steps could be used to improve the simulation speed without scarifying accuracy for power system dynamic which has a dominant fundamental frequency. EMT-TS Hybrid Simulation:  The… Show more Shifted Frequency Adaptive EMT Simulation :  A novel frequency-adaptive methodology with new time domain transformation is proposed.  The component models were obtained by discretizing the differential equations at the branch level which are convenient for EMTP implementation.  Larger time steps could be used to improve the simulation speed without scarifying accuracy for power system dynamic which has a dominant fundamental frequency. EMT-TS Hybrid Simulation:  The LCC-HVDC control system models were implemented in the software PSMODEL which was developed by the Power System Department of CEPRI.  The China Southern Power Grid was simulated by the EMT-TS hybrid program (with seven LCC-HVDC transmission lines).  The AC/DC system interaction was analyzed. Verification of LCC-HVDC Control System Models :  The primary system of LCC-HVDC was validated by the Transient Field Recorder (TFR) of project commissioning.  Each control system block was validated by the Transient Field Recorder (TFR) of project commissioning.  The control system parameters were verified with the Transient Field Recorder (TFR) of step response. Detailed Siemense LCC-HVDC Control System Modeling:  The detailed Siemens UHVDC control system models translated from Simdyn D were implemented in the EMT simulation software PSCAD/EMTDC.  The control system models include the System Measurement, Pole Power Control, Converter Firing Control, Tap Changer Control, Station Reactive Power Control, HVDC Protection and so on. Detailed ABB LCC-HVDC Control System Modeling:  The detailed ABB HVDC control system models converted from HIDRAW were implemented in the EMT simulation software PSCAD/EMTDC.  The control system models include the Pole Power Control (PPC), Converter Firing Control (CFC), Tap Changer Control (TCC), Reactive Power Control (RPC), XYZS-types Block Control and DC Line Faults Restart and so on. Show less