Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 277 for “"Small Signal"”.
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Small -Signal Distributed FET Modeling
… a distributed field-effect transistor (FET) small-signal model that is accurate from do to 110 GHz for a wide range of bias conditions. The distributed model is intended to be compatible with a large-signal implementation. The distributed model performance is compared with that of a standard …
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Small-signal security assessment considering minimum redispatch
… associated to the voltage, transient and small-signal security assessments (VSA, TSA and SSA). The last one is the focus of this research. The development of new tools for small-signal security assessment and their computational implementations in software PacDyn, from Electrical Energy …
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Small-signal analysis of parallel power converters
A small-signal analysis and modelling approach is developed for parallel power converter modules. The small-signal model of parallel buck converter modules is developed in detail to demonstrate the modelling approach. It is shown that a multiple power converter module system can be reduced to an …
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Accurate Small-Signal Modeling for Resonant Converters
… at a premium. However, the lack of an accurate small-signal model has become an impediment to performance optimization. Many modeling attempts have been made to date. Besides the discrete time-domain modeling, most continuous-time modeling approaches are based on fundamental approximation, and …
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Small signal control of multiterminal dc/ac power systems
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1981.
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A new small-signal model for current-mode control
A new small-signal model is developed for pulse-width-modulated converters operating with current-mode control. Four different control schemes are analyzed, all of which use the instantaneous value of the inductor current as part of the control modulation. Continuous-conduction mode and …
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Assessing Renewable Resource Penetration on Power System Small-Signal Reachability
… caused by the renewable-based generation is small enough to justify linearization of the power system around a nominal trajectory. If the reach set is within the region defined by system operational requirements, then we conclude the disturbance caused by the renewable resource does not have …
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Small signal analysis of nonlinear systems with periodic operating trajectories
A new method for small-signal analysis of switching power converters is developed and implemented in a computer program. The method is derived for systems where the nonlinearities can be described by elements that can take on one of two values, based upon a controlling variable. Another requirement …
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Small-signal analysis and design of a distributed power system
A small-signal analysis of a two-stage distributed power system is performed. Although the distributed power system is composed of conventional PWM converters, the analysis methods can be extended to systems using other converter topologies. The analysis focuses on two important features of a …
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AC/DC power system small-signal impedance measurement for stability analysis
… work has shown that a dc power system is small-signal stable if the Nyquist contour of product of the source impedance and load admittance satisfied the Nyquist stability criterion. Methods of extracting impedance in dc systems have been well established. However, for ac systems, the …
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Active-clamp PWM converters: design-oriented analysis and small-signal characterization
… forward converters operated with the ZVS. A new small-signal model that predicts that effect is derived using the state-space averaging, and necessary steps for its elimination are proposed.
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Small Signal Equivalent Circuit Extraction From A Gallium Arsenide MESFET Device
… the need to model them. This thesis extracts a small signal equivalent circuit model from a Gallium Arsenide MESFET device. The approach taken in this thesis is to use measured S- parameters to extract a small signal equivalent circuit model by optimization. Small signal models and S-parameters …
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Dynamic phasor modelling of VSC FACTS devices for small signal stability studies
… unit (IMU) is proposed to monitor the small signal stability.;The proposed IMU can measure accurately the system impedance within a very short time without any filtering requirements. The effect of changing the STATCOM control gains on the impedance norm is investigated. Also, the …
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Comparison of three power system software packages for small-signal stability analysis
Many power system simulation tools exist for small-signal stability analysis. This is due to the rapid development of computer systems, higher industrial growth and the need for reliable power system simulation tools for efficient planning and control of electric power systems. Three power system …
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Small-signal analysis of the phase-shifted zero-voltage switched PWM converter
… on the converter dynamics are analyzed. The small-signal model is derived incorporating the effects of phase-shift control and the utilization of transformer leakage inductance and power FETs junction capacitances to achieve zero-voltage resonant switching. The thesis explains the differences …
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Unified Large And Small Signal Discrete-space Modeling For Pwm Converters In Ccm
… switches , and this approach results in a small signal discrete model. The Second approach is direct and does not involve any approximation of the modulations , this approach yields both a large signal nonlinear discrete model and a linear small signal model. Harmonic analysis of the …
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Small-Signal Modeling and Stability Specification of a Hybrid Propulsion System for Aircrafts
This work utilizes the small-signal impedance-based stability analysis method to develop stability assessment criteria for a single-aisle turboelectric aircraft with aft boundary-layer propulsion (STARC-ABL) system. The impedance-based stability analysis method outperforms other stability analysis …
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Modeling and Implementation of Controller for Switched Reluctance Motor With Ac Small Signal Model
… nature of the SRM. In this thesis, the ac small signal modeling technique is proposed for linearization of the SRM model such that a conventional PI controller can be designed accordingly for the PWM current controller. With the linearized SRM model, the duty-cycle to output transfer …
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Small-signal Analysis and Design of Constant-on-time V2 Control for Ceramic Caps
… such as ceramic caps are preferred due to small size and small output voltage ripple requirement. However, for the converters with ceramic caps, the conventional V2 control suffers from the sub-harmonic oscillation due to the lagging phase of the capacitor voltage ripple relative to the …
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Extended describing function method for small-signal modeling of resonant and multi-resonant converters
… function method is proposed as a systematic small-signal modeling approach to nonlinear switching circuits. This method offers significant simplification upon the previous work on using the multi-variable describing functions to treat the circuit nonlinearities. As an extension to the …
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