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31 results on '"Malekpour, Mostafa"'

30. Modeling DFIG‐based system frequency response for frequency trajectory sensitivity analysis.

Author

Azizipanah‐Abarghooee, Rasoul, Malekpour, Mostafa, Feng, Yue, and Terzija, Vladimir

Subjects
*FREQUENCY response, *SENSITIVITY analysis, *INDUCTION generators, *WIND power, *DERIVATIVES (Mathematics), *ELECTRIC power system control, *HARDWARE-in-the-loop simulation
Abstract

Summary: This paper presents a trajectory frequency sensitivity analysis of a large‐scale power system deploying its simple and reduced order system frequency response (SFR) under sudden load disturbances. By implementing this simple SFR model, the calculation time of the real‐time simulation is reduced while maintaining the needed accuracy. The transfer functions and their related equations in the SFR model are firstly analyzed. Then using trajectory sensitivity analysis, the effects of different parameters (eg, reheat time constant, inertia constant, damping factor, governor regulation, etc.) on the system frequency and its rate of change are investigated. Additionally, the doubly fed induction generator (DFIG) based SFR model with typical rate of change of frequency (RoCoF) based inertial control is derived for system frequency dynamic studies in power systems. The analysis is presented as the evolution of the sensitivities for the frequency and RoCoF in time with respect to the SFR's initial conditions helping to determine the importance of each parameter in different time frames. Furthermore, the trajectory sensitivities are used for the estimation of frequency response with perturbed parameters. The system frequency response in case of DFIG is also evaluated. The observations are useful for power system operators to quantify the grid frequency control capability under wind power penetration. [ABSTRACT FROM AUTHOR]

Published
2019
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31. A New Approach to the On-line Estimation of the Loss of Generation Size in Power Systems

Author

Azizipanah-Abarghooee, Rasoul, Malekpour, Mostafa, Paolone, Mario, and Terzija, Vladimir

Subjects
Inertia, Power imbalance estimation, Loss of generation, PMU, Rate-of-change-of-frequency, Swing equation
Abstract

Following an unintended disconnection of a synchronous generator (SG) from the power system, what is also known as a loss of generation (LoG), it is not trivial to precisely estimate the post-event power system's inertia and the LoG size. One of reasons for that is that both of them are a function of the unknown inertia reduction. To solve this challenging problem, this paper presents an analytical method based on the rate-of-change-of-frequency (RoCoF). The method relies on a modified swing equation, allowing a simultaneous estimation of both unknowns. To this end, the values of mechanical starting time, apparent power and loading of lost generator are formulated for the power system under study. In a practical application, the method can use RoCoF measured by phasor measurement units (PMUs). The paper discusses the impact of various frequency estimation approaches to the proposed LoG estimation. Furthermore, a new method for LoG size estimation, based on the interpolated estimated inertial response, is proposed. The efficiency of the proposed approach is validated through extensive simulations with Matlab/Simulink using a simple power system and the IEEE 39-bus test network.

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