This paper proposes a new method to develop a thermal model of an insulated gate bipolar transistor (IGBT) employing an optical fiber sensor mounted on the chip structure. Some features of the sensor such as electromagnetic immunity, small size and fast response time, allow the identification of temperature changes generated by the energy loss during device operation through direct measurement. In fact, this measurement method is considered impossible with conventional sensors. The online monitoring of the junction temperature enables identify the thermal characteristics of the IGBT. The results are used to develop an accurate model to simulate the heat generated during the device conduction and switching processes. The model showed a difference of only 0.3% between measured and simulated results, besides allowing evaluate separately the heat generated by each turn-ON/OFF process.
The occurrence of islanding of distribution systems is an operational event ever more present in power systems due to the insertion and expansion of distributed generation. In this context, this paper proposes a local load shedding relay to enable the islanded operation of distribution systems with distributed synchronous generators. A supplementary control loop added to a battery energy storage system is also proposed in order to contribute to the frequency regulation in the islanded system. The supplementary control provides frequency regulation support during the transition from grid-connected operation to islanded operation, as well as during normal operation of the islanded system.
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