Metaheuristic techniques have shown remarkable performance in a vast variety of engineering problems. Accurate solving nonlinear equation set selective harmonic elimination (SHE) has been one the widely discussed numerical problems power electronics. Current study aims at conducting an inclusive comparison prominent stochastic methods adopted for SHE and modified (MSHE) pulse width modulation techniques. The problem is defined as finding local optima cascaded H-bride converter operation...

Multilevel converters, because of the benefits they attract in generating high quality output voltage, are used several applications. Various modulation and control techniques introduced by researchers to voltage multilevel converters like space vector harmonic elimination (HE) methods. may have a DC link with equal or unequal voltages. In this study new HE technique based on method is proposed for voltage. The levels considered as additional variables defined results. Increasing number can...

Low-frequency switching strategies are considered as an effective way of achieving efficient performance in multilevel inverters. Selective harmonic elimination (SHE) is a modulation technique this category which gives superior outcome suppressing low-order detrimental harmonics. Limited number decision variables offered by SHE the corresponding non-linear equations hinders obtaining high-quality waveforms. Current research targeted on two distinct objectives for cascaded H-bridge First...

The existence of the double grid frequency (100 Hz) ripple current in dc/ac dual active bridge (DAB) power converters can degrade their performance and as such these ripples need to be compensated. An decoupling method is proposed this paper attenuate 100-Hz single phase DAB converters. Compared other reduction methods for which additional switches are used, does not require any switching components thus decreasing system cost. In method, existing devices primary side full converter an LLC...

Abstract Treatment of wastewater using ultrasound systems is gaining increasing interest due to its effectiveness for a wide range pollutants and no secondary pollutant production. This paper proposes two operating at different ranges electrical power frequency developed remove toxic polycyclic aromatic hydrocarbon (PAH) compounds in wastewater. Both light molecular weight (LMW) high (HMW) were degraded the systems. However, HMW more affected. The experimental results revealed that treatment...

Most high-power ultrasound applications are driven by two-level inverters. However, the broad spectral content of pulse results in undesired harmonics that can decrease performance system significantly. On other hand, it is crucial to excite piezoelectric devices at their main resonant frequency order have maximum energy conversion. Therefore a high-quality, low-distorted power signal needed transducer its frequency. This study proposes an efficient approach develop ultrasonic using...

Piezoelectric transducers convert electrical energy to mechanical and play a great role in ultrasound systems. Ultrasound power transducer performance is strongly related the applied excitation. To have suitable excitation for maximum conversion, it required analyze effects of input signal waveform, medium distortion on characteristic high system (including transducer). In this research, different voltage signals are generated using single-phase inverter linear amplifier excite (water oil)...

High power piezoelectric ultrasonic transducers have been widely exploited in a variety of applications. The critical behaviour device is encapsulated its resonant frequencies because maximum transmission performance at these frequencies. Therefore electronic converters should be tuned those to transfer electrical mechanical efficiently. However, structural and environmental changes cause variations the which can degrade system performance. Hence, estimating within incorporated setup...

A bidirectional integrated bus voltage conditioner (IBVC) for an isolated phase-shifted full bridge (PSFB) dc/dc converter is proposed to reduce the dc oscillations in a cascaded power system, where load controlled tightly with high-control bandwidth. In method, unlike conventional stabilization methods which auxiliary switches are used, multiplexing utilization of at primary side PSFB adopted. this paper, improve stability, equivalent virtual resistor implemented by applying duty cycle...

Active ripple current reduction method is proposed for isolated DC/AC dual active bridge (DAB) converter to reduce the double grid frequency in DC current. Unlike those methods that require extra switches construct separate circuit, this method, one or two branches of LC steering circuits are used along with existing full a multiplexing manner. For purpose elimination, unsymmetrical phase shift modulation and duty cycle regulation applied both legs on primary side DAB converter. Also sharing...

Pulsed electric field (PEF) technology can be utilized to increase the growth rate and total yield alter nutritional composition of agricultural crops. We investigated efficacy PEF treatment on Pleurotus Ostreatus white oyster mushroom species. Mushroom sawdust substrates in buckets were stimulated with a combination two rod-to-plate electrode geometries peak strengths 1.46 6.67 kV/cm through unipolar pulses approximately 20 kV amplitude. Total electrical energy 62.3 kJ (0.017 kWh) over 30...

This paper presents an optimal cooperative voltage control approach, which coordinates storage units in a distribution network. technique is developed for systems’ active power management with local strategy to provide robust and distributed deliver utilization. Accordingly, three criteria based on predefined node limits are used network operation including normal, over-voltage, under-voltage modes. The contribution of support determined using the modes coordination strategies proposed this...

Due to the presence of inherent double-line-frequency power ripple at AC side, operation maximum point tracking (MPPT) can be significantly affected in single-phase DC-AC photovoltaic applications. To reduce and enhance MPPT performance, a large capacitor DC side is normally used. However, it decrease density converter cannot completely eliminate power. mitigate effect ripple, single phase Dual Active Bridge (DAB) for applications proposed. It free common capacitors stages with proposed...

Double-switch buck–boost converter is a distinctly suitable candidate for the front-end in two-stage power systems that can perform step-up/down conversion. Several modulation schemes, such as synchronisation (SM), interleaved (IM) and combined control strategy have been proposed this converter, these methods yield notable advantages different aspects, amplitude of inductor ripple current, conversion efficiency, density so on. However, requirements are not only limited aforementioned...

A nine level modular multilevel cascade converter (MMCC) based on four full bridge cells is shown driving a piezoelectric ultrasonic transducer at 71 and 39 kHz, in simulation experimentally. The are small stackable PCBs, each with two fully integrated surface mount 22 V, 40 MOSFET half-bridge converters, include all control signal power isolation. In this work, the bridges operate 12 V 384 to deliver 96 <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...

Estimating the resonance frequency of a piezoelectric transducer and adjusting operating accordingly are crucial issues when maximum energy conversion is targeted during real-time operation. This paper presents method to detect ultrasonic its operation tune operational in order improve performance.

This paper proposes a high voltage pulse generator that employs switched-capacitor topology. The proposed topology uses H-bridge circuits with SiC MOSFETs which can generate bipolar nanosecond pulse. Then, the H-bridges of are cascaded to ultrafast dv/dt. Operating principle and circuit analysis presented. PSIM PSpice simulations have been carried out 4.8 kV pulses verifying control system.