Real-Time Digital Hardware Simulation of Power Electronics and Drives

Summary form only given. This paper presents a digital hardware realization of a real-time simulator for a complete induction machine drive using a field programmable gate array (FPGA) as the computational engine. The simulator was developed using very high speed integrated circuit hardware description language (VHDL), making it flexible and portable. A novel device-characteristic based model suitable for FPGA implementation has been proposed for the 2-level 6- pulse IGBT-based voltage source converter (VSC). The VSC model is computed at a fixed time-step of 12.5 nanoseconds allowing a highly detailed and precise accounting of gating signals. The simulator also models a squirrel cage induction machine, a direct field-oriented control system, a space-vector pulse-width modulation scheme (SVPWM) and a measurement system. A multi-rate simulation of the system shows the slow (machine) as well as the fast (VSC and control) dynamic components. Real time simulation results under steady-state and transient conditions demonstrate modeling accuracy and efficiency.