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The demand of non-linear and dynamic load is increasing day-to-day causing severe power quality issues. This paper presents a novel control strategy by employing distributed static compensator (DSTATCOM) to mitigate power quality problems. The proposed controller is a combination of a DSTACOM consisting voltage source converter with zig-zag/star transformer for optimizing DC link voltage. The DSTATCOM...
The use of pulse width modulation with selective harmonic elimination (SHE-PWM) in cascaded H-bridges (CHB) multilevel converters allows the reduction of the output current distortion by the elimination of low order harmonic components. However, voltages produced by CHB modules to synthesize the SHE-PWM pattern is an issue that deserves deeper investigation. CHB systems fed by sources with current...
This paper presents a generic output model of multilevel inverters formed through cascaded H-bridges and their flexibility in attaining desired harmonic levels, which could also include elimination of the selected harmonics. The signal model of the possible outputs of a multilevel inverter is mathematically represented and then compared with a conventional signal model that is based on harmonic decomposition...
Power electronics technology has been widely used for decades in the modern motor drive systems. Beyond the control flexibility, the power electronics devices (e.g., diode rectifiers) are also the main harmonic source to the grid due to their nonlinearity, which deteriorate the power grid quality and may cause unnecessary losses in power system transformers. Both degradations are apt to occur in motor...
Nowadays, the multi-level voltage source inverter (MLI) has widely used in industries due to its ability to generate high voltage staircase waveform which its magnitude, phase and frequency is controllable, Whereas, MLIs introduce harmonic to the network would led to power quality problem. This paper presents a novel meta-heuristic method known as Memetic algorithm (MA) to optimize harmonic contents...
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...
This paper presents a new method to optimize harmonic stepped waveform for multi-level inverters using harmony search algorithm. The method has the benefit of high rate of convergence and precision compared to other conventional optimization methods. The proposed technique can be applied to multi-level inverters with any number of levels. The goal of optimization is to eliminate some low order harmonics...
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