We propose a Convertible Static Transmission Controller (CSTC) concept that enables coordinated power flow control with emphasis on large penetration of renewable energy resources based transmission in a meshed network. CSTS can be connected across the substation power transformer and reconfigured for different modes of operation to perform as a versatile transmission controller with several functions including: power flow control for transmission of renewable resources, and as a transformer back-up for disaster management and/or life extension purposes. Different connecting configuration options, i.e. shunt-shunt, series-shunt, and series-series can be obtained. In this paper, we demonstrated the viability of the proposed concept using Typhoon HIL400 ultra-high fidelity Hardware-in-the-Loop (HIL) system in three different modes of operation. HIL simulations are used to verify the validity of the proposed control architecture for CSTC operation during both normal and unbalanced power system conditions for different connecting configurations.

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We describe the design, implementation, and experimental validation of an ultra-fast real-time hardware-in-theloop emulation of a permanent magnet synchronous machine (PMSM) inverter drive. The power electronics converter and machine are modeled using a flexible piecewise linear state space approach and are simulated in hard real-time with 1 µs time step, which enables high-fidelity modeling of converter switching dynamics, including dead time and fully rectifying mode. We validate the fidelity of the real-time PMSM drive emulation by making real-time comparisons with a reference hardware model of a PMSM drive (scaled down system rated at 2.7 A and 200 V). Additionally, we experimentally demonstrate the capability of the hardware-in-the-loop PMSM drive emulation under various operating scenarios, including steady state, transient, and fault conditions.

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