Improved hyper-spherical search algorithm for voltage total harmonic distortion minimization in 27-level inverter

2019 ◽  
Vol 26 (10) ◽  
pp. 2822-2832
Author(s):  
A A Khodadoost Arani ◽  
H Karami ◽  
B Vahidi ◽  
G B Gharehpetian
Keyword(s):  
Search Algorithm ◽  
Harmonic Distortion ◽  
Total Harmonic Distortion ◽  
Distortion Minimization

Optimal total harmonic distortion minimization in multilevel inverter using improved whale optimization algorithm

2020 ◽  
Vol 21 (3) ◽  
Author(s):  
Aala Kalananda Vamsi Krishna Reddy ◽  
Komanapalli Venkata Lakshmi Narayana
Keyword(s):  
Optimization Algorithm ◽  
Heuristic Algorithms ◽  
Harmonic Distortion ◽  
Total Harmonic Distortion ◽  
Whale Optimization Algorithm ◽  
Matlab Simulation ◽  
Multilevel Inverters ◽  
Whale Optimization ◽  
Distortion Minimization ◽  
Optimum Solution

AbstractThis paper presents the solution to mitigate the total harmonic distortion (THD) in multilevel inverters (MLIs) using novel improved whale optimization algorithm (IWOA). The IWOA falls under the category of swarm-based nature inspired optimization algorithms. It uses a novel diffusion process using a random walk technique and utilizes an additional ranking system to estimate the optimum solution to minimize THD. Moreover, THD minimization is further accomplished through nine various meta-heuristic algorithms for investigation and comparative analysis. The selected algorithms along with the proposed IWOA are rigorously tested on single phase 5 and 7 level cascaded H-Bridge MLIs for various performance parameters such as consistency, computational efficiency and speed of convergence. It is found that the proposed algorithm outperforms the nine algorithms and is efficient for THD minimization for modulation index (MI) in the range of 0–1. The results are analyzed and reported after thorough verification using MATLAB simulation.

scholarly journals Reduction of Total Harmonic Distortion of Wind Turbine Active Power Using Blade Angle Adaptive PI Controller

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6798
Author(s):  
Ahmed M. Shawqran ◽  
Abdallah El-Marhomy ◽  
Mariam A. Sameh ◽  
Mahmoud A. Attia
Keyword(s):  
Power Quality ◽  
Search Algorithm ◽  
Harmony Search ◽  
Harmonic Distortion ◽  
Pi Controller ◽  
Active Power ◽  
Total Harmonic Distortion ◽  
Objective Functions ◽  
Blade Angle ◽  
Search Optimization

Power quality can have a large detrimental effect on industrial processes and the commercial sector. Thus, this paper proposes a new technique to improve the power quality of electric power systems. This technique relies on auto-adjusting of the blade angle to mitigate the harmonics in wind generator active power. A new adaptive PI blade-angle controller is applied in this technique to reduce the total harmonic distortion (THD) of the output power. The parameters of the adaptive PI controller are initialized by using the Harmony Search algorithm (HSA), hybrid Harmony Search optimization and Equilibrium optimization (EO), and hybrid Harmony Search optimization and Teaching learning-based optimization (TLBO). The execution of the optimization algorithms relies mainly on the optimization objective function. Two optimization objective functions are mathematically modeled and compared to enhance the power quality. The first one is to minimize the sum square of error, while the second objective is to minimize the THD. Many case studies are applied with various wind-speed profiles under normal and faulty conditions. Results show the superiority of HSA hybrid EO algorithm with the second objective functions through reducing the harmonics and enhancing the power quality. Moreover, laboratory studies are applied to investigate the effect of the blade-angle variations on the extracted active power.

scholarly journals Vortex search algorithm for designing hybrid active power filter

2020 ◽  
Vol 18 (1) ◽  
pp. 443
Author(s):  
Chau Minh Thuyen ◽  
Truong Khac Tung ◽  
Nguyen Hoai Phong
Keyword(s):  
Search Algorithm ◽  
Design Method ◽  
Harmonic Distortion ◽  
Active Power Filter ◽  
Active Power ◽  
Total Harmonic Distortion ◽  
Power Filter ◽  
Hybrid Active Power Filter ◽  
Source Voltage ◽  
Supply Current

<p>This paper proposes a new multi-objective optimization design method for Hybrid Active Power Filter based on the Vortex Search algorithm. The Vortex Search algorithm belongs to the Single-Solution Based algorithm class of Metaheuristics algorithm. This design method has the advantage of fast execution time, high convergence speed and prevent local trap problems. The achieved results are multi-objective, such as minimum total harmonic distortion of the supply current and source voltage and satisfy many constraints such as system stability, resonance conditions of branches and limits of the parameters. Compared with the traditional design method, simulation results have proved that: the proposed design method is given with better results in minimizing total harmonic distortion of the supply current and source voltage.</p>

scholarly journals Reduction of Total Harmonic Distortion in Cascaded H-Bridge Inverter by Pattern Search Technique

2017 ◽  
Vol 7 (6) ◽  
pp. 3292 ◽  
Author(s):  
Suresh N. ◽  
R. Samuel Rajesh Babu
Keyword(s):  
Optimization Problem ◽  
Search Algorithm ◽  
Harmonic Distortion ◽  
Pattern Search ◽  
Total Harmonic Distortion ◽  
Resistive Load ◽  
Search Technique ◽  
Inductive Load ◽  
Analysis Technique ◽  
Mathematical Equations

Pattern Search technique can be used to find the solution for the optimization problem. In this paper, pattern search algorithm has been utilized to calculate the switching angles for the cascaded H-bridge inverter with  the consideration of minimizing total harmonic distortion. Mathematical equations for the optimization problem were formulated by fourier analysis technique. Lower order harmonics such as third, fifth, seventh, ninth and eleventh order harmonics were taken into account to mitigate the total harmonic distortion of the inverter. Simulations have been carried out for thirteen level, fifteen level and seventeen level cascaded H-bridge inverter using matlab software. Total harmonic distortion of voltage and current for resistive load, resistive-inductive load and motor load were analyzed.

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