چکیده:
In this paper, for Selective Harmonic Elimination (SHE) in cascaded multi-level inverters and
reaching optimal switching angles to eliminate low-level harmonics in output waveform,
Imperialist Competition Algorithm (ICA) is used. ICA is implemented on 7-level and 11-level
inverters so that optimal switching angles are achieved by solving formed non-linear equations.
ICA is a general searching strategy with socio-political stimulus which was introduced to solve
different optimization problems and has more accuracy and faster convergence compared to
similar algorithms. Results obtained from ICA will be compared with GA and this method is
superior in achieving general minimum amount and having more convergence rate. To
investigate analyses and simulation results, an experimental sample of inverter in an empirical
study will be presented, as well.
خلاصه ماشینی:
Selective Harmonic Elimination in Cascaded Multilevel Inverters using Imperialist Competitive Algorithm Farhad Zishan1*,Saeed Ganbari 2, Shahriar Amani 2, Mohammad Ahmadi 3 1, 2- Senior Graduate of Electrical Engineering Ardabil Branch, Islamic Azad University, Ardabil, Iran 3-Departman of Electrical Engineering Ahvaz Branch, Islamic Azad University, Ahvaz, Iran *a f.
com Received: January 2018 Accepted: February 2018 Abstract In this paper, for Selective Harmonic Elimination (SHE) in cascaded multi-level inverters and reaching optimal switching angles to eliminate low-level harmonics in output waveform, Imperialist Competition Algorithm (ICA) is used.
Equations obtained from general harmonic distortions in output voltage of cascaded multi-level inverters are considered as Objective Function.
This objective function was used to minimize Total Harmonic Distortion (THD) in output voltage of a multi-level inverter.
To eliminate selective harmonics in cascaded multi-level inverters, using Particle Swarm Optimization (PSO) Algorithm is proposed [2].
And [8] to eliminate selective harmonics based on Genetic Algorithm to solve non-algebraic and non-linear equations, minimization of harmonics in multi-level inverters is utilized using pulse width modulation technique.
Modulation techniques classification of multi-level inverters The methods working the above switching frequency, for power semiconductors in a cycle of output voltage have high commutation.
Output voltage has a stepped waveform and when keys are on one can eliminate dominant harmonics by selecting appropriate switching angles.
2. Formulation of the problem For each multi-level inverter, an appropriate objective function can be defined as Equation (4), [12]: به تصویر صفحه مراجعه شود Where in this objective function, the obtaining switching angles is 0≤ ≤ 2 .