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Lifetime Estimation Of Igbts In A Grid-Connected Statcom, Lakshmi Reddy Gopi Reddy
Lifetime Estimation Of Igbts In A Grid-Connected Statcom, Lakshmi Reddy Gopi Reddy
Doctoral Dissertations
Lifetime estimation of power semiconductor devices, and IGBT devices in particular, used in the power electronics integrated with power systems has gained technical importance in recent times with increased scope of distributed generation, renewable energy systems and FACTS. Since most of the common failures (wire bond and solder fatigue) are caused by thermo-mechanical stresses, the methodology of lifetime estimation starts with temperature estimation, cycle counting based on rainflow algorithm, and finally degradation calculation based on linear accumulation model.
Different number of RC cells for each packaging layer in the module for the thermal model, including the influence of encapsulant is …
Adaptive Control For Power System Voltage And Frequency Regulation, Yao Xu
Adaptive Control For Power System Voltage And Frequency Regulation, Yao Xu
Doctoral Dissertations
Variable and uncertain wind power output introduces new challenges to power system voltage and frequency stability. To guarantee the safe and stable operation of power systems, the control for voltage and frequency regulation is studied in this work.
Static Synchronous Compensator (STATCOM) can provide fast and efficient reactive power support to regulate system voltage. In the literature, various STATCOM control methods have been discussed, including many applications of proportional–integral (PI) controllers. However, these previous works obtain the PI gains via a trial and error approach or extensive studies with a tradeoff of performance and applicability. Hence, control parameters for the …