Induction motor tests using MATLAB/Simplink and their integration into undergraduate electric machinery courses

WOS: 000227051600007This paper describes MATLAB/Simulink implementation of three induction motor tests, namely dc, no-load, and blocked-rotor tests performed to identify equivalent circuit parameters. These simulation models are developed to support and enhance electric machinery education at the undergraduate level. The proposed tests have been successfully integrated into electric machinery courses at Drexel University, Philadelphia, PA, and Nigde University, Nigde, Turkey

Probability of small-signal stability of power systems in the presence of communication delays

6th International Conference on Electrical and Electronics Engineering, ELECO 2009 -- 5 November 2009 through 8 November 2009 -- Bursa -- 79288This paper presents a probabilistic approach to evaluate the small-signal stability of power systems in the presence of communication delays. An exact method is first proposed to determine the relationship between delay margin and system parameters such as the system load. The delay margin is then modeled as a random variable and the probability density function (PDF) of the delay margin is determined based on the PDF of the load using a Monte Carlo simulation approach. The communication delays are assumed to be uniformly distributed in a practical range and the probability of system being small-signal stable for a given time delay is determined using the estimated PDF of the delay margin. The proposed method is applied to a single-machine-infinite bus (SMIB) power system with an exciter

Gain and phase margins based delay-dependent stability analysis of two-area LFC system with communication delays

10th International Conference on Electrical and Electronics Engineering, ELECO 2017 -- 29 November 2017 through 2 December 2017 -- -- 134351This paper investigates the effect gain and phase margins (GPM) on delay-dependent stability analysis of a two-area load frequency control (LFC) system with communication delays. An frequency-domain based exact method that takes into account both gain and phase margins is utilized to determine stability delay margins in terms of system and controller parameters. A gain-phase margin tester (GPMT) is introduced to the LFC system as to take into gain and phase margins in delay margin computation. For a wide range of proportional - integral (PI) controller gains, time delay values at which LFC system is both stable and have desired stability margin measured by gain and phase margins are computed. The time-domain simulation studies indicate that delay margins must be determined considering gain and phase margins to have a better dynamic performance in term of fast damping of oscillations, less overshoot and settling time. © 2017 EMO (Turkish Chamber of Electrical Enginners)

Impact of demand response on stability region of single-area LFC system with communication delay

10th International Conference on Electrical and Electronics Engineering, ELECO 2017 -- 29 November 2017 through 2 December 2017 -- -- 134351This paper investigates the impact of dynamic demand response (DR) on the stability region depicted on the controller parameter space of a single-area load frequency control (LFC) system with communication time delays. An effective and simple graphical method is implemented to compute all stabilizing Proportional Integral (PI) controller gains of DR loop for a given time delay. The approach is based on extracting stability region and the stability boundary locus in the PI controller parameter space. © 2017 EMO (Turkish Chamber of Electrical Enginners).This work was supported by International Postdoctoral Research Scholarship Programme of the Scientific and Technological Research Council of Turkey under the Project 1M056 1059B191600680

Effects of PWM chopper drive on the torque speed characteristic of DC Motor

43rd International Universities Power Engineering Conference, UPEC 2008 -- 1 September 2008 through 4 September 2008 -- Padova -- 77050This paper describes a MATLAB/Simulink realization of the DC motor speed control method by controlling the voltage applied to the armature circuit using a pulse width modulated (PWM) chopper drive. Torque-speed characteristics are obtained for different values of switching frequency to demonstrate its effect on the linearity of the characteristic. The proposed simulation model is developed as a part of a software laboratory to support and enhance undergraduate electric machinery courses at Nigde University, Nigde, Turkey

Stability of a two-area automatic generation control system with communication delays

6th International Conference on Electrical and Electronics Engineering, ELECO 2009 -- 5 November 2009 through 8 November 2009 -- Bursa -- 79288This paper investigates the effect of time delays on the stability of a two-area automatic generation control (AGC) system. The time delays are due to the use of measurement devices and communication links for sending and receiving control signals. The maximum amount of time delay known as the delay margin that the system can tolerate without becoming unstable is determined using Matlab/Simulink. The effect of integral controller gain on delay margin is analyzed

Computation of PI Controllers Ensuring Desired Gain and Phase Margins for Two-Area Load Frequency Control System with Communication Time Delays

This article deals with computation of all proportional-integral (PI) controllers which achieve the desired frequency-domain specifications namely, gain and phase margins (GPMs) of a traditional two-area load frequency control (LFC) system with constant communication delays. An efficient graphical method based on extracting the boundaries of stability regions in PI controller parameter space having user defined GPMs is proposed to obtain GPMs based stability regions. Regions are determined for a wide range of GPMs and time delay. The theoretical region boundaries are validated using a powerful numerical method known as the quasi-polynomial mapping-based root finder (QPmR) and time-domain simulations. Results indicate that the proposed scheme gives faster disturbance rejection and desired frequency response as compared to the recently developed scheme for LFC systems with communication delays. © 2018, Copyright © Taylor & Francis Group, LLC