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In this article, a design methodology for DC-DC converters with high insulation capabilities (up to 30kV) is proposed. The objective is to provide a power transmission function for IGBT drivers. To achieve this, a DC-DC full-bridge series-series (FB-SS) resonant converter with a high air gap transformer is selected and studied. This high air gap transformer (loosely coupled transformer (k)) is used...
In this paper, two types of new submodule (SM) circuits are proposed for modular multilevel current source converter (MMCSC) with dc fault ride through capability, namely, type I diagonal bridge SM (DBSM) and type II DBSM. The topologies and possible operation states of the two types of DBSMs are presented. Each type of DBSM is capable of providing bipolar voltages in unidirectional current. Replacing...
Reliability of multilevel power converters has received increased attention over the past few years, due to the relatively high component failure probability caused by the large number of switching devices utilized in the converter topologies. Thus, the fault-tolerant operation of multilevel converters plays an essential role in safety-critical industrial applications. This paper introduces an improved...
The flying-capacitor-based multicell converter is one of the well-known breeds of multilevel power converters. This paper proposes a new flying-capacitor-based multilevel converter to minimize the number of flying capacitors (FCs) and power switches. The advantage of the proposed FC-based multilevel converter in comparison with the conventional flying capacitor multicell converter is the fewer number...
The 15kV SiC IGBT has second higher dv/dt turn-off slope above the punch-through level resulting in EMI. Increasing gate-resistance also slows the first dv/dt causing increased switching loss. A snubber capacitor assisted turn-off solves these issues for a high power dual active bridge (DAB) converter based on this device, but the light load turn-on ZVS becomes hard to achieve. This paper proposes...
During standard robustness evaluations of a NPC type 2 IGBT power module a non-described effect in a Three Level NPC 2 topology was observed. A full description of that effect can help to protect IGBT power modules in this topology against blow ups and can help in a post mortem analysis to understand the reason for this. With a full understanding of that effect the lifetime of the inverter can be...
In this paper, a new basic unit for cascaded multilevel inverter is proposed. The proposed basic unit consists of m cells. Each cell can generate three levels. The proposed multilevel inverter is based on series connection of several basic units. The proposed multilevel inverter is investigated at both symmetric and asymmetric topologies. In order to generate all voltage levels at the output, four...
In this paper, a new topology for asymmetrical cascaded multilevel inverter is proposed. The proposed topology consists of series connection of several basic units. Reduction of number of power switches, driver circuits, IGBTs and dc voltage sources are some advantages of the proposed topology in comparison with the conventional cascaded multilevel inverters. In order to generate all output voltage...
Transformerless single phase photovoltaic inverter has attracted power generation system due to its higher efficiency and low cost. One of the main problems in transformerless single phase photovoltaic inverter is to control leakage current appearing between parasitic capacitor and ground. The leakage current has to be controlled to avoid EMI problem and circuit damage. The main goal of the proposed...
Induction heating for domestic usage is quite popular and in some countries, it is a highly cost-sensitive product. A single IGBT (Insulated Gate Bipolar Transistor) quasi resonant power stage is the most popular topology for this application. In this paper we explain method in which the topology works reliably irrespective of widely varying input voltage, open loop operation and inconsistent utensil...
In this paper a dual gate driver for IGBT capable of driving top and bottom switches of an inverter leg is proposed. This dual gate driver uses forward converter topology to provide necessary gate current to charge IGBT gate capacitance CGE along with isolation between control circuitry and power circuit. This gate driver will operate from 10% to 90% of duty cycle. The driver output is a two level...
Multilevel inverters generate a level output voltage from DC voltage sources. Requiring nice range of semiconductor switches is main disadvantage of structure inverters. The structure inverters are divided in 2 groups: symmetric and Asymmetric converters. The Asymmetric structure inverters give an oversized range of output steps while not increasing the quantity of DC voltage sources and elements...
Global warming is already having significant and costly effects on our communities, our health, and our climate. Nowadays, In developing countries (G20) around the world, decisions are being considered and a shifting of our dependence from fossil fuels to renewable energy sources (RES). Among RES solar energy, specially photovoltaic system (PV) play a key role in this challenge, thus, this paper provides...
In this paper, a sophisticated configuration for symmetric multilevel voltage source inverters is proposed. In multilevel inverters, the costs, circuit size so installation space, complexness of control scheme and reliability are directly depended to the amount of circuit devices required. The provided comparison study among proposed inverter, CHB and recently introduced converters, validates that...
Partially shaded problem in multi-string PV panels is a major challenge because it reduces the value of generated power from PV panel. In this paper, a new cascaded high step-up DC-DC-AC converter based on SEPIC converter is proposed for partially shaded multi-string PV panels. To solve the challenge of partially shaded in PV system, a SEPIC dc-dc converter is connected for each string and the duty...
This paper investigates the reliability of different topologies of grid connected photovoltaic (PV) systems. The topologies considered in this study are centralized topology, string topology and multi-string topology. The reliability of each topology is evaluated by using suitable reliability indices that are based on calculating the probability of different operating states. These states are evaluated...
The modulation technique chosen for use in the power converter largely defines the harmonics generated, consequently it is a fundamental part that must be studied. In this paper it's shown a comparative between different modulations techniques applied to a modular multilevel converter. Sinusoidal Pulse Width Modulation, Space-Vector Modulation and Nearest Level Modulation are studied. The whole techniques...
Efficiency improving methods, while maintaining the unity power factor, represent a major research topic in the PFC rectifiers' area. This paper introduces three novel highly efficient three-phase interleaved buck-type unity power factor rectifiers, namely the interleaved six-switch, the interleaved swiss and the interleaved eight-switch topologies. Compared to the switching strategy of the single-stage...
DC-AC conversion has been revolutionized by multi-level converters due to their high power quality, high modularity and high voltage operation with standard semiconductors. New multilevel topologies, voltage asymmetries and control techniques have been developed in the last decade to improve the performance of these power converters. This paper proposes a novel voltage asymmetry for a three-phase...
Fault-tolerant operation of power converters has been a challenge for engineers and designers. Although several schemes have been proposed in recent years, they are typically restricted in terms of their capability to recover from successive failure events. The recently proposed Fault-tolerant ANPC converter has been shown to be able to deal with multiple failure events due to its flexible and reversible...
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