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This paper proposes a 5-level single-phase multilevel inverter topology with reduced number of components. In order to validate the proposed structure, simulation and experimental results are presented. In addition, the proposed topology is compared with an existing counterpart structure in terms of number of levels and number of devices and value of power supply.
This paper presents a thorough study on Five-Level Packed U-Cell inverter called PUC5. The main advantage of PUC5 topology over other popular multilevel ones is the redundant switching states, which facilitate the voltage balancing of the flying capacitor in its configuration. Switching states of the PUC5 inverter are analyzed to ensure an easy voltage balancing process. That voltage controlled auxiliary...
Common mode voltage (CMV) and switching frequency of an inverter fed induction motor drive are dependent quantities. Increase in common mode voltage (CMV) with increase in switching frequency for induction motor drive is studied in this paper. Conventional sinusoidal pulse width modulation technique is used to drive an inverter fed induction motor. It is demonstrated that the peak value of CMV increases...
This paper presents a seven level inverter utilizing switched-capacitor technique. Proposed topology employs two asymmetric DC voltage sources as input and generates a multilevel staircase output. The structure includes a front-end switched-capacitor based DC-DC converter cascaded by a back-end H-bridge inverter. The frontend SC DC-DC converter feeds three DC voltage levels to the H-bridge inverter...
This paper proposes a technical space vector modulation (SVM) for three-level flying capacitor converter with only a single pai switching transitions between the vectors as well as the transitions between of each chosen sequence space vector diagram sectors. The algorithm also ensures the lowest number of commutations between threads and sectors which provides the reduction of commutations losses...
This paper describes a development of a high power density power converter using flying capacitor multilevel circuits for PV systems. To connect the PV systems to a power grid, a power conditioner system (PCS) is required. Sine wave filters and EMI filters are required to satisfy harmonics regulations such as CISPR. These filters are dominant in a total volume of the PCSs. To design a small PCS to...
Multilevel inverters have evolved and developed into a mature and successful technology as a result of its high power applications based electronic power conversion capabilities. The aim of this paper is to review various recently developed three phase multilevel inverter topologies with different configurations and control methodologies such that number of components employed is reduced and ultimately...
In hybrid microgrids, integration of multiple renewable energy sources to AC and DC buses of grid require a boost and multi-level inverters. Depending on the requirement, these boost and multi-level converters are connected either in parallel or in cascaded. In this parallel or cascaded arrangement the device count and control complexity increases. And, also it requires a separate AC and DC output...
A novel three-phase multilevel inverter using a single dc source is proposed in this paper, which uses flying capacitors for generating different voltage levels. Pole voltage levels can be of five levels or higher than that. The structural similarity of the front end of the proposed inverter with that of the three-level neutral-point clamped inverter and the presence of redundant switching states...
Multilevel inverter enables to completely remove the passive filtering requirement at the grid interfacing end, resulting in improved efficiency and reduced cost. These features have led to increasing attention towards their application to medium and high-power arena. In this paper, investigation of a hybrid 9-level inverter topology for grid integration of renewable energy sources is presented. The...
This paper proposes a new hybrid asymmetric multilevel inverter for generating the higher number of levels with reduced number of power semiconductor switches. The hybrid asymmetric multilevel inverter consists of full bridge inverter and reduced switch inverter topology. The reduced switch inverter topology can generate 13-level output voltage without utilizing full bridge inverter. When the full...
This paper proposes three-level flying capacitor inverter based distribution static compensator (DSTATCOM) for shunt applications. Also, two new floating capacitors voltage balancing schemes using loss balancing technique have been proposed to balance capacitor voltages. Because of benefits like simplicity, transformation less implementation, and scope of desired power factor setting; a generalized...
Cascaded H-bridge multilevel inverter is a matured topology used in several industries and also being used in renewable energy applications due to its several advantages over traditional two-level inverter. This paper is focused on the study of five-level and fifteen-level cascaded H-bridge inverter and total harmonic distortion in output voltage waveforms is compared. Phase disposition technique...
In this paper, a new operating scheme for five-level hybrid flying-capacitor (5L-HFC) inverters is proposed, of which structure is derived from the conventional five-level active neutral-point-clamped (5L-ANPC) topology by splitting the DC-link into three capacitors in series. In this inverter, the lower number of switching devices is required, thus its cost is reduced considerably compared with the...
This paper introduces the new multilevel inverter with reduced number of devices for grid connected PV modules applications. The proposed inverter needs reduce number of devices therefore the size, complexity and cost are much lower than the conventional and other recently proposed multilevel inverters. The proposed multilevel inverter is capable to produce 9/13/17- levels in an output using only...
This paper puts forward a single-DC source based seven-level inverter for harvesting energy from renewable sources. Three single-phase transformers with cascaded outputs are powered from the switching power circuit resulting in then generation of multilevel at the output of the inverter. The proposed configuration can generate output voltage having levels of magnitude (−3VDC, −2VDC, −VDC, 0, VDC,...
In recent years, the majority of the research has focused on grid-tied transformerless PV inverters, more capable than traditional grid-tied line transformer-based PV inverters, but more critical from a power quality point of view, especially in terms of common mode voltage and ground leakage current. Neutral point clamped (NPC) converters have recently gained popularity due to high efficiency and...
In this paper a new hexagon type (H-Type) sub-block for multilevel inverter (MLI) is introduced suitable for both symmetrical and asymmetrical configurations. The proposed MLI consist cascaded hexagon type sub-blocks to generate more levels in output. The working of topology is presented in detail along with the possible switching states. PDPWM technique is used to generate modulation analysis of...
This paper proposed a Single-Phase 13-level inverter with voltage control method using semiconductor power devices for photovoltaic systems. The multilevel voltage source inverters unique configuration allows them to make high voltages with low harmonics without use of transformers or series associated synchronized switching devices. The general role of the multilevel inverter is to synthesize a desired...
Modular multilevel converter (MMC) is an attractive topology for transformer-less high voltage applications due to its capability to reach high voltage levels by the use of power semiconductors. Each submodule can be considered as a controlled voltage source where capacitor's voltage should be maintained at a certain level for proper operation of the MMC and for fault detection and protection purposes...
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