Generic AC-DC load-flow solution method with controllable AC-DC converters

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Generic AC-DC load-flow solution method with controllable AC-DC converters This project is for conducting research on load-flow computation methods capable of accounting for the integration of inverter-based systems into traditional AC power grids. The project targets distribution power grids with AC microgrids, hybrid AC/DC microgrids and multiterminal VSC HVDC systems. The objective is to deliver new and generic load-flow solution methods capable of simultaneously solving coupled AC-DC networks for establishing steady-state conditions while accounting for converter controls and various operating modes. The nonlinear load-flow solution will be based on converter constraints added into traditional AC power-flow equations. The load-flow solution will be followed by steady-state solution. The steady-state solution will use lumped network models to determine all phasors and to allow for automatic computation of initial conditions leading into time-domain simulations. Such initialization should impact by determining accurate AC-DC system steady-state phasors and by dramatically reducing computing times wasted in the circuit-based time-domain simulation of grids with AC-DC converters. The objective is not only to provide advanced load-flow analysis tools to system operators and planners, but to also deliver powerful initialization methods for detailed time-domain simulations of inverter-based and large-scale power systems. Load-flow time-series solutions allowing to analyze the intermittent nature of renewable energy sources, will be also included in this research. The proposed new methods will be tested on AC and hybrid AC/DC microgrid benchmarks, as well as on multiterminal VSC-HVDC system benchmarks. Test cases with large scale integration of renewable energy sources, such as photovoltaics and wind turbines will be demonstrated. Very large-scale transmission and distribution grids will be simulated. It will be shown that proposed research can automate engineering tasks for studying modern power systems. It will reduce simulation setup and initialization timings for simulations performed in time-domain. It will deliver powerful new means for studying AC/DC systems and for increasing the operational robustness and efficiency of such systems. The proposed work will impact on research in the field of AC/DC systems which are becoming increasingly popular in the world. It will benefit the Canadian industry involved in the deployment of such systems. It will also benefit the Canadian industry involved in simulation software development.