Efficient steady-state computation of a power electronic converter system by the envelope following method

A fast and efficient steady-state simulation method of a power electronic (PE) system is proposed. The conventional methods are efficient only for a single-rate periodic system. The proposed method is efficient also for a multi-rate periodic system including a PE system which has a short switch and a long system periods. Its principle is based on a new extended combination of the envelope-following and the conventional shooting methods which solve the steady-state boundary value condition set efficiently. Furthermore the multiple shooting technique is utilized to solve circuit and sensitivity equations efficiently in parallel by a cluster computing system based on MPI (Message-Passing-Interface). Examples of a motor drive system controlled by a converter are analyzed and their results are validated for accuracy and computational efficiency.