In this paper, a new strategy for voltage balancing of distinct dc buses in cascaded H-bridge rectifiers is presented. This method ensures that the bus capacitor voltages converge to reference value, even when loads attached them are extracting different amounts power. The proposed can be used an arbitrary number series H-bridges, levels, and power levels unidirectional or bidirectional rectifiers. To reduce current harmonics distortion, input programmed sinusoidal phase with voltage;...

The power-voltage characteristic of photovoltaic (PV) arrays displays multiple local maximum power points when all the modules do not receive uniform solar irradiance, i.e., under partial shading conditions (PSCs). Conventional point tracking (MPPT) methods are shown to be effective irradiance conditions. However, they may fail track global peak PSCs. This paper proposes a new method for MPPT PV both PSCs and By analyzing pattern using popular Hill Climbing method, proposed tracks points....

In this paper, a generalized switching technique for cascaded H -bridge (CHB) converters is proposed. To take advantage of both low- and high-frequency modulation techniques, hybrid method utilized. The proposed employs the low-frequency voltage balancing dc-link capacitors, sinusoidal pulse-width shaping input ac current. Using technique, stable operating region CHB extended. capable maintaining dc voltages balanced even under critical conditions in which load one H-bridge cell removed....

This paper presents a new interleaved coupled-inductor nonisolated bidirectional dc-dc converter that provides high voltage gain ratio (VGR), low ripple current at the low-voltage side (LVS), and soft switching. The VGR is obtained by connecting in series outputs of an buck-boost dual-active half-bridge converter, using turns coupled inductor. Since high-voltage shared between converters outputs, stress across active switches decrease. turn ON under zero-voltage switching condition both...

In this paper, an optimal design procedure for LCC-series compensation network is proposed a stationary wireless electric vehicle charger. The main focus of paper to optimize the resonant suitable wide range operation from no-load full-power operation. conventional methods only consider full-load condition network; in contrast, method employs time-weighted average efficiency different coupling conditions achieve high over load including light-load and tuned realize zero voltage switching...

This paper presents a new fault-tolerant solution for cascaded H-bridge (CHB) converters, which generates equal output voltages in both prefault and single fault conditions. To generate balanced three-phase voltage with the highest amplitude regardless of location its type, an auxiliary module is employed series CHB converter. The two-level voltage-source inverter capacitive dc link. brought to circuit after detection capacitor charged by novel algorithm reference value. Then, using space...

In this study, fault-tolerant operation of multilevel cascaded H-bridge (CHB) inverters is presented and a novel switching strategy based on space vector modulation proposed. A faulty power switch in high converters can lead to expensive downtime, loss productivity increased costs. Various faults their influence diagram CHB are investigated. the event fault, output voltage inverter reduced redundant states used generate balanced line-to-line voltages. By adding some devices basic structure,...

In this paper, the selective harmonic elimination (SHE) technique is introduced for a cascaded H-bridge-based static VAR compensator (CHB-STATCOM) with unequal capacitive dc-link voltages. The asymmetric topology allows increasing number of voltage levels while keeping converter losses low. Moreover, reactive power control realized by using decoupled current control, and individual capacitors controlled help SHE modulation. Mathematical equations are derived synthesizing multilevel ac...

In partially shaded photovoltaic (PV) arrays, the power-voltage curve displays multiple maxima, one of which is global maximum power point (GMPP). One major concerns related to PV systems locate and track GMPP in all circumstances boost efficiency. Combining conventional hill climbing (HC) algorithm artificial neural networks (ANNs), a new two-stage tracking method introduced this article that aims be fast accurate. Moreover, it does not require irradiance or temperature sensors. first...

Multilevel converters have received increased interest recently as a result of their ability to generate high quality output waveforms with low switching frequency.This makes them very attractive for power applications.A Cascaded H-Bridge converter is multilevel topology which formed from the series connection cells.Optimized pulse width modulation techniques such Selective Harmonic Elimination (SHE-PWM) or Mitigation (SHM-PWM) are capable pre-programming harmonic profile waveform over range...

Partially shaded (PS) photovoltaic (PV) arrays have multiple peaks at their P-V characteristic. Although conventional maximum power point tracking (MPPT) algorithms are successful when PV under uniform irradiance conditions (UICs), speeds low and may fail to track global (GMPP) for PS arrays. Several MPPT been proposed Most of them require numerous samplings which decreases speed increases energy loss. The method in this paper gets the GMPP deterministically very fast. It intelligently takes...

In this paper, a control method based on the derivative of power is introduced for single-stage single-phase grid-connected cascaded H-bridge (CHB) photovoltaic inverters. The proposed scheme uses solar arrays with respect to current track maximum point each array individually. Using along hybrid modulation technique allows utilization CHB cells up their full potential. system has simple structure, and inherently able stabilize under heavy mismatching conditions where index goes higher than...

This paper introduces a new fault-tolerant strategy for cascaded H-bridge (CHB)-based static synchronous compensator (STATCOM) with single failure in power switches. A modified selective harmonic elimination pulse width modulation technique is proposed postfault operation which generates the maximum possible balanced line-to-line voltages at ac side of converter. The dc-link cells are used as another degree freedom; and by an efficient amount increase voltages, rated capacity STATCOM...

An interline dynamic voltage restorer (IDVR) is a new device for sag mitigation which made of several restorers (DVRs) with common dc link, where each DVR connected in series distribution feeder. During the period, active power can be transferred from feeder to another one and sags long durations mitigated. IDVR compensation capacity, however, depends greatly on load factor, higher factor causes lower performance IDVR. To overcome this limitation, idea presented paper enables reducing under...

This paper deals with the operation of a cascaded H-bridge (CHB) converter-based STATCOM under unbalanced grid conditions. Degrees freedom and operational limitations CHB during condition are analyzed according to converter power flow equations. Based on this analysis, an improved low-voltage ride-through (LVRT) strategy for is proposed. In strategy, operator can control both positive- negative-sequence reactive currents independently within range STATCOM. addition, keep submodules'...

In this paper, an improved postfault strategy is introduced for modular multilevel converters, which utilizes the remaining healthy capacity of converter more efficiently and increases line voltage amplitude under these circumstances. Previous works proposed to use neutral point shift in ac side dc simultaneously. This paper adds a comprehensive coherent formulation, deep analyzation, experimental validation. The main improvement method maximizing using optimum component best position....

This article deals with the effects of creep failure mechanism on thermomechanical reliability power semiconductors. Regarding semiconductors' working conditions, fatigue and mechanisms are two most critical origins in Here, we propose an approach to show role event creep-fatigue a semiconductor. The results that 34% difference lifetime prediction appears when is considered estimations. indicates extra effect evolution systems can markedly decrease lifetime, which ignored many cases....

This article presents a nonlinear passivity-based control for grid-connected cascaded H-bridge (CHB) photovoltaic (PV) system. The proposed system is based on port-controlled Hamiltonian model extracted from the synchronous reference frame Grid current dynamics included in this model. Compared to existing solutions, method has robust performance and enhances stability of CHB-based PV case disturbances such as unequal irradiance over distinct arrays or sudden sag swell grid voltage....

This study presents an improved voltage balancing strategy which can be employed on multilevel cascaded H‐bridge (CHB) rectifiers using low switching frequency. The proposed method balances the of all DC links in a CHB rectifier to predefined value, without increasing number transitions. redundancy states are available produce level used balance each transition. Moreover, well‐known selective harmonic elimination‐pulse width modulation method, current components up 29th eliminated...

This study presents design and analysis of a dynamic voltage restorer (DVR) which employs cascaded multilevel inverter with capacitors as energy sources. The enables the DVR to connect directly medium networks, hence, eliminating series injection transformer. Using zero compensation method, does not need active storage systems, such batteries. Since system only includes capacitors, control will face some additional challenges compared other systems. Controlling around reference keeping...

The dynamic voltage restorer (DVR) is a series compensator for distribution system applications, which protects sensitive loads against sags by fast injection. DVR must estimate the magnitude and phase of measured voltages to achieve desired performance. This paper proposes phasor parameter estimation algorithm based on recursive variable fixed data window least error squares (LES) method control system. proposed algorithm, in addition decreasing computational burden, improves frequency...