High-Speed Real-Time Simulation for Power Electronic Systems

Real-time simulators have been used as an aid to power system design for many years. Over time, scaled-down physical models and analog computer-based simulators have given way to real-time simulators based on digital technology. Another trend has been the need for shorter and shorter frame times for these digital real-time simulators. Modern power electronic systems use high-frequency Pulse-Width Modulated (PWM) controllers. Indications are that frame times of 2 mu S are needed for PWM switching frequencies of 10 KHz. As frequencies increase further it is possible that frame times of less than 1 mu S may be required. In order to achieve these very short frame times, the implementation of this type of simulator requires careful selection of the methods and technologies used. The first involves thorough analysis of the integration method chosen, to ensure that it provides the performance, stability and accuracy required. Additionally, the choice of computing platform is crucial to provide the computational support to meet these very aggressive timing requirements.