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This paper proposes a single-phase ac-dc-ac converter composed of two three-leg converters connected in series with an H-bridge on its grid side. The proposed converter allows to feed the load voltage with sinusoidal voltages with constant amplitude and frequency and to operate with sinusoidal grid current with high power factor. Besides, the converter can be used to mitigate fundamental overvoltage...
In this paper, the circuit topology of single-stage isolated charging/discharging DC-AC converter with second harmonic current suppression is proposed. Based on which an analogous-rectifying unipolar phase-shifted control strategy with constant charging/discharging current is also proposed, which rectifies the Sinusoidal Pulse Width and Position Modulation(SPWPM) wave of high-frequency(HF) transformer...
To avoid large overvoltage when the current of the dc-link inductor is interrupted, overlap time is added to the drive signals in current source converters, which results in the extra harmonic in grid current. Waveforms of AC side current before and after added overlap time are achieved from analysis of the current commutation process. The expression of overlap current is given according to the pulse...
In most of the power electronics inverters it is desired to produce clean sinusoidal waves without the use for any filtration in the output. This topic gathered the attentions of many researchers because it helps reduce the cost of the inverters. This paper presents floating source multilevel inverters that utilize double switching frequency modulation technique. This modulation method consists of...
In this paper, the performance of a Single DSTATCOM is evaluated for the purpose of harmonics elimination, reactive power compensation and load balancing. A control scheme has been proposed for DSTATCOM and its characteristics are investigated by digital simulation. A current controller on the single-phase basis forms the innermost loop in the control hierarchy. The dc bus voltage controller and PCC...
This paper introduces a set of synchronized Space Vector Pulse Width Modulation (sSVPWM) techniques suitable to be used with five-phase voltage source inverters (VSI), for both static loads and adjustable speed drives. Medium voltage speed drives usually operate at reduced switching frequencies trying to minimize the semiconductors' switching losses. However, with low switching frequencies undesired...
This paper proposes a novel topology based on the interleaved H-bridge qZS inverters that is intended for the single-phase photovoltaic systems. The potential benefits are the reduced passive components and improved quality of energy generation. To control the novel topology, a proper modulation technique was developed with the required phase-shifted carriers signals and shoot-through states.
In this paper, a three-phase five level inverter with new balancing algorithm is proposed using Selective Harmonics Elimination PWM. The inverter is fed photovoltaic generator as dc source. 36 redundant vectors are making use for the 12 unbalance cases of four capacitor voltages instead of 24 cases presented in the previous works. The obtained results show that the frequency of the PWM is unchanged.
In this paper, three modulation strategies based on a multicarrier level shifted PWM and third harmonic injected reference have been implemented; the aim of this paper is to compare these three strategies to know their effect on the output voltage quality of the inverter. The three modulation strategies are: Third Harmonic Injected reference In Phase Disposition (THI-IPD), Third Harmonic Injected...
Current harmonics produced by power converters are strictly limited to ensure power quality in renewable energy integration systems. Quasi Z-source Inverter (qZSI) is used in such systems as a single stage Buck-Boost DC-AC converter. In this paper, the harmonic performance of space-vector modulated (SVM) three phase grid-tied qZSI is investigated. Traditional SVM and Modified-SVM schemes are analytically...
The problem of designing a zero mean two-level switched periodic waveform with a prescribed harmonic content is considered. A solution is obtained by posing it as a linear programming problem, with the DC bus utilization (ratio of the total power in the prescribed harmonic content to the square of the DC bus voltage) as the cost function and the prescribed harmonic content as linear constraints. The...
The inverter is a device that is used as an interface between the photovoltaic energy and the grid. The harmonic and distortion of the output current, and efficiency of the inverter are the main issues. This paper presents a model of Sinusoidal Pulse Width Modulation (SPWM) methods of unipolar and bipolar inverters in MATLAB and Psim software. A numerical model of the LC filter is derived in order...
Dual-inverter drive of open-end winding ac machine is equivalent to the conventional three-level inverter system from the point of view of voltage vector count, but is simpler in the structure. Decoupled PWM strategy is usually used in the dual- inverter drive. In this paper, it is proposed that a three-phase open-end winding permanent magnet synchronous motor (PMSM) is driven with a five-leg inverter...
This paper will analyze the power quality of multilevel voltage waveforms generated using three modulation strategies: i) a conventional nearest level control (NLC) strategy, ii) NLC with harmonic elimination, and iii) optimized selective harmonic elimination (OSHE). A uniform sampling frequency of the sinusoidal voltage is considered for NLC modulation. It is found in all selected experimental results...
In this paper, an electronic phase-shifting strategy has been optimized for a multi-parallel configuration of line-commutated rectifiers with a common dc-bus voltage used in motor drive application. This feature makes the performance of the system independent of the load profile and maximizes its harmonic reduction ability. To further reduce the generated low order harmonics, a dc-link current modulation...
This paper presents two hybrid four-leg inverters that can be be employed in unbalanced three-phase systems. The proposed topologies are based on a modular multilevel cascade converter (MMCC) with double-star chopper cells (DSCC) associated to a conventional two-level (2L) leg. A comparative analysis in terms of the harmonic distortion and semiconductor power losses between the proposed configurations...
Dual Active Bridge (DAB) converters offer an unmatched capability to transfer energy in either direction between two DC sources, especially when they are operated under Zero Voltage Switching (ZVS) conditions. However, the parasitic commutation inductance within the bridge phase leg devices can still lead to significant energy losses at device turn-off despite operating under ZVS conditions. These...
This paper proposes a Predictive Control, formally Dead-Beat (DBC), for a four-leg inverter having an Active Split DC-bus on the fourth leg and LC filters on phase-to-neutral outputs. Such a configuration permits to reduce the voltage ripple on the neutral point connected to inverter grounding. As only few control techniques have been investigated for Active Split DC-bus, the paper proposes to investigate...
Conventional three-phase diode or controlled rectifiers generate current harmonics which affect power quality of distribution networks. This paper presents a novel topology with a front end Modular Multi-Parallel Rectifiers (MMR): Active DC link current controllers are utilized for each rectifier connected to a common DC link capacitor which can reduce line current harmonics emissions significantly...
In this paper, comparison between two different Pulse Width Modulation (PWM) techniques employed for three phase voltage source inverter (VSI) is discussed. The three phase voltage source inverter is basic topology used to supply a grid. In this paper we have design a LC filter between the inverter and the grid in order to stabilize the output voltage. The filter gives sinusoidal three phase voltage...
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