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Solar powered water pumps classically use a boost converter for power point tracking followed by a motor inverter to drive the pump. This paper introduces a new, novel solution using a Multi-Functional Converter (MFC) that combines the boost function and the motor inverter function into a single, 6-switch, inverter bridge. Thus reducing cost and complexity and increasing reliability. The paper describes...
The voltage source inverter (VSI) of an uninterruptible power supply (UPS) is a system where the main objective is to obtain a high quality output sinusoidal voltage with independence on the output load. For this reason, it includes an output LC filter. The presence of the filter increases the complexity of the controller design thus it is necessary to evaluate the performance of the control strategy...
Photo Voltaic (PV) generators today find application in the domestic field, where the decentralized power conversion concept has proven to be more advantageous than the conventional string architecture. According to the decentralized power conversion concept, PV modules are connected to a single phase AC grid through a two stage converter composed of a DC/DC converter and an inverter. The DC/DC converter...
This paper presents space vector based quasi two-level operation of a diode-clamped multilevel inverter in an attempt to improve the dc link utilization and output voltage quality, and avoids dc link capacitor voltage balancing problems experienced with standard multilevel operation. Beside a review of quasi two-level operation and a capacitor voltage balancing method, the paper presents a detailed...
In this paper a novel approach to the design of a PV module integrated inverter is presented. The parametric design of a transformerless topology is performed by avoiding the use of large capacitance values. Simulation and experimental results are shown.
This paper is concerned with the design and practical implementation of a robust digital current controller for a three-phase voltage source grid-connected interleaved inverter. Each phase consists of 5 half-bridge channels connected in parallel. Due to the current ripple cancellation of the interleaving topology, only small output filter capacitors are required which provide high impedance to grid...
In this paper, we analyzed the behavior of a three phased inverter used in speed drives in radiated mode and we modeled it by equivalent diagrams representing electric operation and including parasitic elements. First, we tried to link the amplitude spectra of the radiated magnetic field and the electrical time measurements (currents). Then, under some assumptions, we proposed a modelling of the main...
Three transformerless converters for three phase solar applications are compared concerning efficiency, leakage current and mechanical volume. The investigated topologies are the voltage source inverter (VSI), the three level neutral point clamped (NPC) inverter and the z-source inverter (ZSI). Therefore the topologies are introduced and the working principles are explained. The power losses, the...
In this paper, authors propose a novel six-band hysteresis technique to control the seven level packed U cells (PUC) converter which was first introduced in. This converter combines advantages of the flying capacitor and the cascaded H-bridge topologies. The study of the novel converter allows the establishment of the switches gates signals equations. In case of rectifier operation, the proposed six-band...
In this paper, some novel and modified driving techniques for a single switch zero voltage switching (ZVS) topology are introduced. These medium/high frequency and digitally synthesized driving techniques can be applied to decrease the dangers of peak currents that may damage the switching circuit when switching in out of nominal conditions. The technique is fully described and evaluated experimentally...
In this work, several strategies to control a three phase three-level Neutral Point Clamped (NPC) rectifiers are presented. This type of converter has two operation modes, as rectifier or as inverter. As rectifier, the dc-link is split in two, being two capacitors placed at the output. The objective of control the dc-link capacitors voltages balance is the goal of this paper. This capacitors voltages...
In some photovoltaic applications it is possible to remove the transformer of the system in order to reduce losses, cost and size. In transformerless systems the photovoltaic module parasitic capacitance can introduce leakage currents in which the amplitude depends on the converter topology, on the pulse-width-modulation and on the resonant circuit composed by the system components. In this paper...
A new shunt active filter is proposed here to reduce the harmonic contents in source voltage and source currents of a harmonic polluted three phase system supplying a non-linear load. The shunt active filter is designed with a eleven level cascaded H-bridge inverter. To generate the required compensation currents multi carrier PWM Currents are extracted from the load power using Synchronous Detection...
This paper describes the boost mode test of a current source inverter (CSI) fed permanent magnet synchronous motor (PMSM) drive. By using a dc-dc converter together with the CSI, the output voltage of the CSI can be boosted. The modified field oriented control scheme for this CSI PMSM drive is explained and tested in real-time control. The modeling and experimental results show the CSI can drive the...
This paper presents a predictive method of current control for grid connected three level neutral point clamped inverter in synchronous rotating frame. The predictive current controller calculates the inverter voltage required to force the load current to follow the reference. To validate the performance the computational time has been compared with DSP processor TMS320C240 and the maximum permissible...
Assuming that STATCOM has no active power losses, the current and voltage analytical expressions of the three-level and dual three-point STATCOMs under the fundamental frequency modulation (FFM) control are presented by means of the theoretical analysis method. Meanwhile, the current and voltage waveforms of two STATCOMs are simulated with the help of Matlab/Simulink. The good agreement between theoretical...
This paper proposes a new half-bridge inverter based active power quality compensator (APQC) for electrified railways with a three-leg inverter. The first-leg is connected to α-phase, and the second-leg is connected to β-phase. The midpoint of two capacitors on the dc side is connected to the ground line. These two half-bridge inverters exchange the active power on the each feeder each other through...
This paper presents a single-phase grid connected inverter with a power decoupling circuit. In the single-phase grid connected inverter, it is well known that a power pulsation with twice the grid frequency is contained in the input power. In a conventional inverter, electrolytic capacitors with large capacitance have been used in order to smooth the DC voltage. However, lifetime of those capacitors...
This paper proposes a grid-connected PV system based on the series Z-Source inverter, and also proposes an indirect DC-link voltage control method for the system. The operation principle of the system is presented. The current control strategy is also designed, which makes the output current synchronize with grid voltage, thus the system could transform power to utility grid with a unit power factor...
Dc-link capacitor voltages must be actively controlled in Multi-Point-Clamped (MPC) converters, in order to achieve a correct voltage sharing. This work demonstrates that when a MPC Active Front End (AFE) rectifier feeds a MPC inverter a balancing strategy does exist that is able to guarantee a correct functioning in all operating conditions. The analytical work, which has been performed to determine...
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