Unlike traditional AC power grid system, power electronics system normally contains fast switch power electronics components, above several KHz. In order to simulate such a system precisely, the simulation step should be 1/50 or 1/100 of the PWM control signal, which means the simulation step should be between several hundred ns and few μs. Such a small step makes real-time simulation very challenging to achieve. ModelingTech is one of the few companies all over the world that master the power electronics system real-time simulation technology, using switch - L/C modeling theory and the great parallel-computation ability of FPGA to solve the problem.