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The modular multi-level converter is an upcoming topology for drive application in the megawatt power range. This paper presents a comprehensive reliability survey for this kind of converter which can be used for its optimal designing. In this survey, converter total failure rate, is calculated for different number of output levels to find the optimal condition in which converter can provide the best...
Modular multilevel converter (MMC) is a promising topology of Voltage Source Converter based High voltage Direct Current (VSC-HVDC) system with many outstanding advantages such as low switching frequency, low voltage distortion and harmonics. Pre-charge process is one of the core issues of MMC based system, especially for the MMC with DC fault blocking capability. In this paper, considering a novel...
A novel single-phase five-level active rectifier based on the VIENNA-type rectifier with model predictive current control is presented. The proposed topology operates in unidirectional mode, imposing a sinusoidal grid-side current with unitary power factor. A unidirectional electric vehicle battery charger is the target application in which the proposed rectifier is used; however, it can also be used...
This paper proposes a new high-voltage Pulse Generator (PG), fed from low voltage dc supply Vs. This input supply voltage is utilized to charge two arms of N series-connected modular multilevel converter sub-module capacitors sequentially through a resistive-inductive branch, such that each arm is charged to NVS. With a step-up nano-crystalline transformer of n turns ratio, the proposed PG is able...
This paper presents the design and control of a three-phase ground power supply unit for aircraft servicing. A new mixed technology converter composed by a three-phase Silicon Carbide (SiC) full bridge unit and a three-phase full bridge IGBT unit connected across the same dc link is used instead of the conventional full bridge configuration. In order to satisfy the stringent requirements of the output...
In this paper, three configurations of three-phase ac-dc cascaded converters are presented. They are referred as basic configurations, and are composed by two three-phase bridges, where the second bridge is cascaded to the first by means of a three-phase injection transformer. Basic configurations have one bidirectional option (composed only by IGBT switches), and two unidirectional ones (composed...
Since the traditional half-bridge modular multilevel converter (HB-MMC) is endangered under DC side short-circuit faults. This paper proposes a novel sub-module (SM) topology for MMC with DC fault limitation capability. The fault current is fully transferred to the bypass thyristor by turning off all IGBTs when DC short-circuit fault occurs, then the diode freewheeling effect is eliminated and all...
In this paper, the authors describe the design of an 80kW power converter for an electrostatic precipitator using SiC MOSFETs. The structure of the converter is based on the series parallel resonant topology, PRC-LCC, with a capacitor as output filter. This topology can cope adequately with the parasitic elements of the step-up transformer involved in the application. The SiC switches present lower...
This paper presents the operation principle and benefits of a novel power converter topology named three-level two-stage decoupled Active Neutral Point Clamped Converter (3L-TDANPC), which is implemented based on a hybrid utilization of Si IGBTs and SiC MOSFETs. The 3L-TDANPC converter can achieve high efficiency with limited number of SiC MOSFET modules while keeping balanced distribution among the...
Hybrid DC circuit breakers have the advantages of fast fault current interruption with the solid-state semiconductor devices and low conducting loss with the mechanical switches. Therefore it is suitable to be used in the multi-terminal DC transmission system. The objective of this paper is to determine a voltage sharing between the mechanical switch and the IGBTs in a proposed topology of hybrid...
Series connected IGBTs provide a useful method to improve the voltage level, and which is a very important approach to achieve high-voltage power converters. However the imbalance of collector-emitter voltages across IGBTs is a key issue that must be addressed. This paper proposed a novel type of series connected IGBT circuit with voltage self-balance by using clamping diode and snubber capacitor,...
Active neutral point clamped (ANPC) converter was developed in order to improve the performances of the neutral point clamped (NPC) converter in terms of the semiconductor loss distribution. Loss distribution depends primarily on modulation type used for generation of the switching signals, therefore it is important to find the appropriate modulation type that will allow the most uniform loss distribution...
Constructing multi-terminal high voltage dc (HVDC) systems can effectively make it possible for the large-scale new energy to be integrated into the grid and make up the defects of the existing ac power system. When constructing the multi-terminal dc system, one cannot avoid the problem that how to control the dc power flow effectively. When nodes are increased and structure of dc grids becomes more...
High frequency is an effective method to improve transmission efficiency of inductively coupled power transfer (ICPT) system. However, it is hard for the high capacity semiconductor device to meet the high frequency need. In this paper, a novel multiple-frequency inductively power transfer system is proposed. By adopting a novel multiple-frequency topology of inverter, the transfer frequency of the...
The Modular Multilevel Converter (MMC) has become the choice topology for integration of renewable energy power plants into the grid, through submarine HVDC cables and HVDC lines. Nevertheless, the MMC requires significant large DC storage capacitors to mitigate for the large power pulsations that result from the single-phase like AC to DC conversion process that takes place in the arms. This work...
This paper presents an improved cascaded DC-DC resonant converter for offshore windfarms. The improvements are reduced losses and the number of components. The topology is based on the Marx principle where charged capacitors are charged in parallel and discharged in series to achieve the voltage transformation. The four inductors of the converter are designed to resonate with the capacitors to create...
Four DC/DC converters are analyzed and compared with respects to availability, efficiency, ratings, repair costs and power density. Intended application is offshore wind farms with MVDC power collection. The selected topology is a new series resonant converter, which offers 99% efficiency across the entire operational range, but needs components designed for high voltage stress.
In this paper, two new hCB concepts for DC-grids are presented, which use a pulse current to extinguish the arc in the mechanical switch after opening. Both concepts are capable to adjust the pulse current amplitude/waveform to the fault current amplitude and so generate a slow current slope di/dt directly before the zero current crossing without large passive components for a fast and reliable fault...
Modular Multilevel Converter (MMC) has served as a promising Voltage Source Converter (VSC) for High Voltage Direct Current (HVDC) applications. In this paper, a new MMC Submodule (SM) topology called Modified Switched Capacitor Sub-Module (MSCSM) is proposed. The MSCSM is able to block the DC fault using the power electronics semiconductor diodes due to its intelligent configuration without the need...
In modern traction drives the transformer causes a high amount of the overall losses. A transformer with lower losses however increases the THD of the output current and the amplitude of the fault current. Two converters will be presented which make the utilization of an enhanced transformer possible.
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