Measurement of magnitude and frequency of the voltage flicker is very important for monitoring andcontrolling voltage flicker efficiently to improve the network power quality. This paper presents twonew methods for measurement of flicker signal parameters using Shuffled Frog Leaping Algorithm(SFLA) and Imperialist Competitive Algorithm (ICA). This paper estimates fundamental voltage andflicker magnitudes and frequencies with proposed methods. The goal is to minimize the error of theestimated magnitudes and frequencies via a designed fitness function. At first, we introduce voltageflicker and its measuring techniques. Then voltage flicker model is analyzed. At the next part, a reviewof SFLA and ICA is presented. These methods will be applied to a test voltage signal and the resultsare be analyzed. پرونده مقاله

In this paper, the mitigating subsynchronous resonance (SSR) phenomenon has been designed in modified IEEE- first bench mark including DFIG-based wind farms connected compensated transmission lines that includes a series capacitor with fuzzy controller. In addition, wide- area measurement systems have been used in the fuzzy controller. This paper designs a fuzzy logic wide-area damping controller to mitigate SSR by considering the time delay caused by the (Phasor Measurement Unit) PMU measurement. The fuzzy controller is a supplementary signal at the stator voltage of the gird-side converter (GSC) of DFIG-primarily based wind farms. This controller is executed by including voltage and capacitor voltage variations of series capacitive compensated. The effectiveness and validity of the proposed auxiliary damping control had been verified on a modified scheme of the IEEE- first benchmark model via time area simulation analysis by using MATLAB/Simulink. پرونده مقاله