This paper concentrates in demonstrating and analyzing the effects of limits on power system eigenvalue computations when system parameters change. A 3-bus system is used to illustrate and analyze the effect that limits and their modeling have on the system eigenvalues. The results obtained for the simple test system using a classical eigenvalue computational tool versus those obtained using a...

The use of Cann’s model for modeling nonlinear circuits and systems is discussed in this paper. It is shown that this model has a nonphysical behavior for the small-signal regime in most cases (it has no some derivatives and, correspondingly, cannot be expanded in a Taylor series) and gives incorrect predictions for nonlinear products. When nonlinearities are to be taken into account in the sim...

Turbo-generators can be subjected to negatively damped subsynchronous frequency oscillations caused by the interactions between the generator and the external network. This phenomena is termed as subsynchronous resonance(SSR) and it is well known that series compensated ac lines are the major contributors. In recent years, it has been established that HVDC systems with converter controllers can...

This paper focuses on the small-signal stability of power system integrated with DFIG-based wind farm. The model of DFIG for small-signal stability analysis has built; the 3-generator 9-bus WECC test system is modified to investigate the impacts of large scale integration of wind power on power system small-signal stability. Different oscillatory modes are obtained with their eigenvalue, freque...

Planar linear motors have been shown to be capable of fast accurate 2-DOF motions making them useful for assembly tasks. However, the lack of sensing capability has limited their applications. Previous planar motor sensors have been precise but bulky and sensed only a single direction of motion. We present a small integrated 3-DOF sensor capable of 0.2 m position resolution (1 ) which has been ...

background: with increasing age, some changes appeared in specifications of vessels which including dimensions and elasticity in their. the changes in parameters such as resistance, inertance and compliance vessels appear and eventually changes in the environmental pulse releases are in circulation. these changes clearly appear in specification of photoplethysmogram particularly in the size and...

ultra-wideband (uwb) radio is a promising technology for low-cost, high-rate communications at short ranges. however, high bandwidth and low power of the uwb signals impose some difficult challenges in signal processing and implementation of the receiver. acquisition of the signal timing is the first task to be performed in a coherent receiver. the high bandwidth of uwb signals demand for fine ...

This paper presents a novel multi-port DC/DC converter which is suitable to be used as the interface of hybrid renewable energy systems. The converter contains three unidirectional power flow ports which two of them are input ports and are connected to two independent energy sources while the third one is the output port that feeds a standalone load. Furthermore, the proposed converter contains...

realistic mobility models can demonstrate more precise evaluation results because their parameters are closer to the reality. in this paper a realistic fuzzy mobility model has been proposed. this model has rules which are changeable depending on nodes and environmental conditions. it seems that this model is more complete than other mobility models.after simulation, it was found out that not o...