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A total harmonic distortion (THD) optimization based 5-level selective harmonic elimination pulse width modulated (SHE-PWM) single-phase reduced device count (RDC) voltage source inverter (VSI) is presented in this paper. A MATLAB program is developed for offline calculation of switching angles based on quarter wave (QW) symmetry of the output and overall THD optimization method of SHE-PWM. The inverter...
The harmonic problem is as a consequence of nonlinear power electronic devices in powering industrial distribution systems. A filter is a necessary equipment in the power system to reduce or eliminate harmonics.In this paper, the optimal design of filters to reduce total harmonic distortion (THD) has been investigated using the Matlab/Simulink. Bee Colony Optimization (BCO) is applied as optimization...
In order to improve the performance of the three phases PLL system, this paper designs an algorithm to optimize the PI controller parameters based on the integral of squared error theory. First, it analyzes the nonlinear character of the three phases PLL which uses the d-q coordinate transformation theory to lock the voltage phase, and deduces the closed loop transfer function of the PLL system with...
Paper considers the problem of measurement of higher harmonics of current for rectifying devices during design with help of simulation models and MATLAB. The consumed current calculated by simulation model of the rectifying device is used in MATLAB where it is exposed to fast Fourier transform and harmonic analysis. Then power circuit and noise reducing filters optimization is performed based on results...
This paper proposes the application of Differential Evolution (DE) algorithm to the selective harmonics elimination pulse-width modulation (SHE-PWM) scheme. The aim is to solve for the set of transcendental equations that determine the switching angles of the SHE-PWM waveform. The objective function of DE is designed to minimize the selected harmonics to near zero. Furthermore the fundamental component...
Nowadays high quality power is essential for medical, research and industrial applications to produce good quality results and analysis. In this paper, an attempt has been made to improve the quality of power. A single phase seven level cascaded multi level inverter with identical dc supply is designed to reduce the harmonic components of the output voltage. Genetic algorithm optimization technique...
Using multilevel inverters in fuel cell & solar cell & wind turbines is increasing. Harmonic reduction techniques in multilevel inverters are considered. Mathematical methods for reducing the harmonic are presented in some of the literatures Mathematical methods are not suitable for high level inverters. These methods analyze harmonics with constant output voltage of each inverter.
In this paper, an optimization-based control algorithm for the compensation of steady-state load under distorted supply voltages is presented. For balanced and sinusoidal supply voltages, load compensation using shunt active filter produces perfect harmonic cancellation (PHC) and unity power factor (UPF) source currents. However, when the supply voltages are distorted, compensation for PHC will not...
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