Nonlinear fractional-order power system stabilizer for multi-machine power systems based on sliding mode technique

2014 ◽  
Vol 25 (10) ◽  
pp. 1548-1568 ◽  
Author(s):  
Sajjad Shoja Majidabad ◽  
Heydar Toosian Shandiz ◽  
Amin Hajizadeh
Keyword(s):  
Power Systems ◽  
Power System ◽  
Fractional Order ◽  
Sliding Mode ◽  
Power System Stabilizer ◽  
System Stabilizer ◽  
Mode Technique ◽  
Sliding Mode Technique

A Robust Control with the Combination of Fuzzy and SMC to Stabilize the Power System

2016 ◽  
Vol 4 (2) ◽  
pp. 341
Author(s):  
Mohammadreza Barzegaran ◽  
Sana Tajvidi
Keyword(s):  
Power Systems ◽  
Power System ◽  
Single Machine ◽  
Fuzzy Controller ◽  
Sliding Mode ◽  
Convergence Time ◽  
Power System Stabilizer ◽  
Sliding Mode Controller ◽  
Single Machine Infinite Bus ◽  
System Stabilizer

<p>Common power system stabilizer (CPSS), fuzzy power system stabilizer (FPSS) and sliding mode controller (SMC) are common controllers which are used in controlling single machine infinite bus (SMIB) power systems. Each of these controllers has disadvantages. CPSS is not robust enough to stabilize the power system perfectly. SMC is more robust than CPSS but in the presence of big uncertainties it is unable to stabilize power system. FPSS is enough robust in the presence of big uncertainties, but it causes chattering when high switching gain is needed. The goal of this paper is to present a robust controller for a single machine infinite bus (SMIB). The proposed controller is a direct fuzzy controller assisted with a sliding mode controller. The simulation shows clear positive effect and validity of the method in convergence, time and accuracy.</p>

scholarly journals An Accurate Method for Delay Margin Computation for Power System Stability

Energies ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 3466 ◽  
Author(s):  
Ashraf Khalil ◽  
Ang Swee Peng
Keyword(s):  
Time Delay ◽  
Power Systems ◽  
Power System ◽  
System Stability ◽  
Area Measurement ◽  
Power System Stabilizer ◽  
Iteration Algorithm ◽  
Measurement Units ◽  
System Stabilizer ◽  
Delay Margin

The application of the phasor measurement units and the wide expansion of the wide area measurement units make the time delay inevitable in power systems. The time delay could result in poor system performance or at worst lead to system instability. Therefore, it is important to determine the maximum time delay margin required for the system stability. In this paper, we present a new method for determining the delay margin in the power system. The method is based on the analysis in the s-domain. The transcendental time delay characteristics equation is transformed to a frequency dependent equation. The spectral radius is used to find the frequencies at which the roots cross the imaginary axis. The crossing frequencies are determined through the sweeping test and the binary iteration algorithm. A single machine infinite bus system equipped with automatic voltage regulator and power system stabilizer is chosen as a case study. The delay margin is calculated for different values of the power system stabilizer (PSS) gain, and it is found that increasing the PSS gain decreases the delay margin. The effectiveness of the proposed method has been proved through comparing it with the most recent published methods. The method shows its merit with less conservativeness and fewer computations.

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