Electro-Thermal Transient Performance Assessment of SiC Based Distributed Generation Inverters when Governed by Virtual Synchronous Machine Control or Conventional dq Control

摘要

With increasing converter-interfaced distributed generation (DG) on the grid there is a reduction of inertia conventionally safeguarded by the inertial dynamics inherent to synchronous machines (SM). Resulting frequency instability can be mitigated by an increasingly popular means of DG inverter control known as virtual synchronous machine (VSM) or synchronverter control where the dynamics of SMs are mimicked by inverter control. Notably, advanced DG inverter functions can come with detrimental impact upon the reliability of the system. This work assesses the impact of VSM upon the reliability by use of electro-thermal device models of a SiC power MOSFET and provides insight for power electronics system reliability evaluation. All modeling is performed in ANSYS Simplorer.