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This paper proposes a new solution to balanced inverter to achieve near zero common-mode voltage generation for a three-phase inverter. The neutral-point diode-clamping solves the issue of desynchronization of the balanced inverter. As the switching frequency of PWM inverter can be increased with the advances in power semiconductor technology, the common-mode voltage related issues in motor drives,...
This paper presents a method for calculating the semiconductor losses in asynchronous and synchronous PWM buck converters when operated as a fixed-VI, fixed-RL, variable-Vo dynamic power supply. Equations are derived for MOSFET switching and conduction losses in both circuits, as well as diode conduction and forward-voltage losses. This work also compares the two topologies from the perspective of...
In this paper, the conventional three-level diode-neutral-point-clamping (3L-DNPC) inverter is deeply investigated from the view of power loss. It is concluded that the conventional 3L-DNPC inverter has high zero-vector conduction loss due to clamping Diode+ IGBT structure's high on-state voltage, high clamping diode reverse recovery loss and so on. Therefore, the clamping diodes are most deeply related...
Multilevel inverter technology has become very important in terms of energy control. The aim of this paper is to presents a comparative study of photovoltaic (PV) based five level, seven level and nine level diode clamped inverter (DCMLI). Photovoltaic array simulation and pulse width modulation (PWM) technique for diode clamped multilevel inverter (DCMLI) is presented for different level of inverter...
In this work it is presented a family of six single-phase Current Source Rectifiers (CSR) topologies with asymmetric structures. The topologies present reduced number of active switches and high power factor with low harmonic distortion. Three of the shown structures represent a simplification of full-bridge CSR, replacing two switches from the original topology by two diodes. The other three structures...
This paper discusses the proposal of a single-phase inverter to deal with the leakage ground current problem in transformerless photovoltaic systems. The high efficiency and low cost allow non-isolated inverters to widespread their applications in the grid connected photovoltaic energy market. The removal of the low or high frequency transformer in a photovoltaic system let a ground path for the circulating...
This paper presents analysis and comparison of most commonly preferred pulse width modulation strategies such as PD, POD, APOD PWMs to control the speed of an induction motor by using seven level diode clamped multilevel inverter. Different multi-carrier PWM techniques are investigated for Voltages, currents, apparent power, active power, reactive power, power factor and THD. Several interesting characteristics...
Among Renewable Energy Systems, Photovoltaic systems are widely used as they are clean and easily installable. These PV cells convert sunlight into electricity in the form of dc. A suitable converter is usually needed to convert the dc power into ac power, which is then injected into the power grid. Recently the use of multilevel inverters (MLIs) in modern drives and for interfacing the renewable...
This paper proposes a single-phase four-level converter comprising one two-level leg and one flying capacitor three-level leg. The two arms are connected via coupled inductors, forming a single-phase inverter half-bridge. When compared to other four-level inverters, the proposed topology has just one flying capacitor, lower losses and harmonic distortion, and a smaller number of semiconductor devices,...
This paper presents a new bridgeless zero-voltage switching (ZVS) ac-dc boost power factor corrected converter for application in power supplies and battery chargers. This converter utilizes standard average-current-mode control while operating in both pulse-width-modulation (PWM) mode and resonant mode each switching cycle. This modulation technique can be referred to as hybrid-resonant PWM (HRPWM)...
400 V DC distribution networks present a promising solution for supplying high-power DC loads such as information processing systems, transportation battery charging facilities and DC micro grids, among others. For these applications, high transmission efficiency, reliability and controllability are mandatory. With the current technology, these loads are fed from PWM rectifiers which are connected...
This paper presents a loss calculation method based on the selection of IGBTs and Diodes, and on an analysis of conduction and switching losses in multilevel pulse width modulation (PWM) systems. A comparison between the Modular Multilevel Converter (MMC) and other multilevel topologies, adapted to medium voltage applications, will thus be presented in order to highlight issues such as thermal disparity...
The add-on battery pack in plug-in hybrid electric vehicles can be charged from an AC outlet, feed power back to the grid, provide power for electric traction, and capture regenerative energy when braking. Conventionally, three-stage bidirectional converter interfaces are used to fulfil these functions. In this paper, a single stage integrated converter is proposed based on direct AC/DC conversion...
This paper presents a new configuration of Neutral-point-clamped (NPC) or Diode Clamped converters called Reduced Diode Clamped Multilevel (RDCM) Converter. In this topology, the number of clamping diodes and high frequency switches are decreased while the voltage ratings of them during a full cycle are kept constant. Compared with conventional NPC or Diode Clamped converters, The main advantages...
Dual Buck inverter(DBI) is a new topology which has the characteristics of high frequency and efficiency. But the output voltage of the bridge is a bipolar PWM waveform and voltage stress of the component in DBI is high, just like the half bridge inverter. To overcome these problems, a novel three-level DBI, which has unipolar PWM output waveforms and low voltage stress, is presented in this paper...
A novel noninverting boost-buck dc-dc converter topology is presented, applicable when both sides of the converter need to have the same grounding. It is based on the back-to-back connection of two n-level diode-clamped converter legs, and allows bidirectional power flow. A simplified topology is proposed for unidirectional power flow applications. Two new pulse width modulation strategies with different...
In domestic grid connected PV applications a single phase converter is usually used. In such a low power plants it is possible to adopt converter topology with no galvanic isolation between the photovoltaic panels and the grid. The absence of a high or low frequency transformer permits to reduce power losses, cost and size of the converter. On the other side in presence of a galvanic connection a...
Recent contributions in pulse width modulations (PWM) for multilevel diode-clamped converters enable the use of these converters with passive front-ends, any number of levels, and small DC-link capacitors. Highly compact converters designs based on these topologies can be envisioned. However, the design of the gate-driver power-supply for the multiple controlled semiconductor devices remains an important...
Decades of research have seen single-phase boost-type PWM converters be employed as front-end PFC rectifiers in commercial power supplies. The benefits of employing this technology to comply with power quality standards while assuring high efficiency and low volume and weight have been observed. However, this work shows that further efforts can be driven into new topologies. In this context, a new...
In the previous literature, the introduction of the virtual space vector concept for the three-level three-leg neutral-point-clamped converter has led to the definition of pulsewidth modulation (PWM) strategies guaranteeing the dc-link capacitor voltage balance under any type of load, with the only requirement being that the addition of the three phase currents equals zero. This paper presents the...
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