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The VSC-HVDC can enhance the performance of power systems and plays a major role in the dynamic stability of power systems. In addition VSC-HVDC controller can be utilized to mitigate torsional torque and prevent sub-synchronous resonance (SSR) effectively. In this paper a controller has been designed for VSC-HVDC to suppress sub-synchronous oscillations. The Control methodology that is employed as...
Metal-oxide surge arresters have dynamic characteristics which are significant for overvoltage coordination studies involving the fast front surges. This paper describes an operating analysis of the metal oxide surge arrester same IEEE model, Pinceti model, Popov model and a proposed model which is adequate for very fast rate of the rise of surge currents. The paper presents the application of surge...
In this paper, frequency of distorted signal in power system has been estimated with particle extended Kalman filter. Base of particle algorithm, extended Kalman filter and particle extended Kalman filter are mentioned. For selecting state variables, a nonlinear time-variant sinusoidal signal is developed then a particle extended Kalman filter is applied to detect the frequency variations. Several...
The Medium-voltage (MV) circuit breakers can fail to interrupt three-phase fault currents when power systems have transient recovery voltage (TRV) characteristics which exceed the rating of the circuit breaker. Surge arresters protect equipment of transmission and distribution systems. Arresters installed today are all metal-oxide (MO) arresters without gaps. This paper presents the application of...
In this paper, the authors report on the design, simulation and validation of a new input signal Adaptive Neuro-Fuzzy Inference System (ANFIS) based Power System Stabilizer (PSS) for a multi-machine power system and investigate its performance in damping low frequency local and inter-area oscillations. Instead of conventional input pairs like speed deviation (????) and acceleration (????) in this...
The thyristor Controlled series capacitor (TCSC) is one of the most promising components in flexible AC transmission system (FACTS).It can adjust the power flow and improve the stability of power system . TCSC's different advantages can be classified as steady-state and transient ones. During a fault, TCSC can enhance power quality by limiting the current and help to keep the voltage as high as possible...
With the increase in the number of static synchronous compensator (STATCOM) type FACTS devices in transmission lines, transient behavior of power transmission systems in presence of fault accuracy are affected, that is due to the impacts of these devices on operation of relays during fault clearing. It is very important that the distance relays do not malfunction under system fault conditions, as...
Permanent magnet synchronous motors are being manufactured and used increasingly in low to medium power range applications due to their inherent advantages. In transient state of the IPM motor reach maximum torque per ampere is necessary and in steady state optimal efficiency for IPM is desire. In this paper an optimal controller for IPM has been designed to achieve maximum torque per ampere in transient...
This paper presents a novel extended Kalman filter based method for estimating and tracking the RLC load resonance frequency. Assuming the load like an RLC circuit, state-space equations of the system is derived. A nonlinear time-variant model of the circuit is developed and an extended Kalman filter is performed to predict the performance of the system by estimating the real-time resonance frequency...
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