5. System Safe Operation Area Based on Switching Characteristics

The concept of the system safe operation area (SSOA) came from transients of power electronic converters. Such a concept is beneficial for the system reliability evaluation and optimization design. It is related to the device safe operation area (DSOA) with however obvious difference. The SSOA involves interactions between switches and other peripherals. From the aspect of the system analysis, the SSOA contains the power semiconductor devices, power conversion circuit and pulse control. It is based on the DSOA, emphasizes the interactions of DSOA, conversion circuit and pulse controls, and resolves the conflict between the reliability and maximum usage of power electronic converters from the aspect of the energy conversion and multi-timescale transients.