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A reliable multilevel inverter with fault tolerance is proposed. It consists of two sources and six switches. The unipolarity voltage level produced by the proposed inverter is transformed to dual polarity with the help of H-bridge. The proposed inverter produces maximum 9 levels output voltage with asymmetrical source and 5 levels output voltage with symmetrical source in healthy condition. During...
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...
This paper proposes a new modular multilevel converter with symmetric bidirectional DC fault blocking capability for high voltage direct current transmission systems. The new modular multilevel converter is composed of novel submodules, which is developed from a three-level T-type converter combined with some clamp circuits. The proposed novel submodule can output three voltage levels with six IGBTs,...
The interleaved bidirectional DC-DC converter is a core component of the battery energy storage system. However, if an open-switch fault occurs at the interleaved bidirectional DC-DC converters, the currents of two branches will become unbalanced, which will increase the battery current ripple and shorten the life of batteries and energy storage systems. In this paper, a fault tolerant topology is...
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...
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...
This paper deals with the fault effects analysis and diagnosis in 6-Φ PMSM designed for aerospace applications. The addressed work aims to analyze the features offered by the space vector theory applied to these systems for fault detection and identification purposes. The paper starts with a presentation of the overall electric drive system structure and its control. Then, fault effects analysis under...
The modular multilevel converter (MMC) is a competitive candidate for VSC-HVDC systems. However, the conventional HB-MMC can't block dc link fault current because of the freewheeling effect of diodes. To solve this problem, researchers proposed an account of sub-modules (SMs) with DC-fault current clearing capability. This paper summarizes the 2 basic criteria and provides a comprehensive review of...
The brushless doubly-fed generator (BDFG) has the advantages of brushless structure, variable-speed constant-frequency operation, flexibly controllable active and reactive powers, low converter capacity and cost, and so on, which is very suitable for the wind power generation, especially the large wind turbines and offshore wind farm [1].
Power converter open-circuit fault leads to reduction of motor output performance. Fault-tolerant control strategy, which is applied to power converter of four-phase doubly salient electro-magnetic motor (DSEM) drive, is investigated in this paper to improve the post-fault motor performance. A fault-tolerant topology is newly presented. It has the advantage of simple structure with only two bidirectional...
A fault tolerant three phase five-level inverter configuration for the application of islanded photovoltaic (PV) systems is proposed. The fault tolerant five-level inverter configuration is achieved by stacking a two-level inverter, a three-level neutral point clamped inverter along with three bidirectional switches. This configuration is fed with two DC sources. The proposed configuration shows fault...
Due to the flybacks' indirect characteristic of energy transfer, the transformer size increases for high power levels. Providing an additional direct energy transfer path can decrease its size. Parallel forward-flyback converters offer such functionality and outperform forward converters with regard to PFC functionality. A balanced forward-flyback converter is a variation on this kind of parallel...
Multilevel inverters (MLIs) consist of increased number of power semiconductor devices for the generation of desired output voltage. As the number of components increases, the probability of fault due to power semiconductors increases drastically. Although the MLI topologies are in a matured state, the research in fault detection and diagnosis (FDD) in MLIs is still in a developing stage. This paper...
Solar storms can induce quasi-dc geomagnetically induced current (GIC) flows in power grids, which could potentially lead to transformer damage and system stability and reliability issues. We consider the problem of designing operational GIC mitigation strategies by switching transmission lines. This topology control approach could relieve the power network from temporarily high level of GIC flows,...
Protection coordination represents one of the main challenges in the developing process of reliable and efficient DC systems. In the current research, a new protection coordination scheme based on fault matrix concept was developed. A testbed was established at Institute of High Voltage Engineering and Electrical Power Systems (elenia) laboratory, Braunschweig University of Technology to verify the...
A novel fault-tolerant power converter topology is developed based on conventional active neutral point clamped (ANPC) converter. The effect on converter performance due to open/short circuit faults of power devices is investigated. By leveraging the redundant leg in the proposed topology, the lost voltage vectors in the space vector diagram can be restored. This new fault-tolerant topology is capable...
The Series-Resonant dc-dc converter (SRC) is widely used in several application and it became very popular in Smart Transformer application. In this application, fault tolerance is a highly desired feature and it is obtained through redundancy. This paper proposes a reconfiguration scheme for the SRC for the case of failure in one semiconductor, which could drastically reduce the need of redundancy...
This paper deals with the fault tolerance analysis applied to the converter topology 5-level unidirectional T-Rectifier (5L T-RECT) to be used for electric generating applications. The proposed generating unit is intended for aerospace applications with high fundamental electric frequency, to this purpose the investigated power electronic converter configuration is able to supply power to the electric...
Self-blocking MMC (SB MMC) is able to isolate DC fault current and is promising for use in overhead HVDC transmission. Each converter arm of a SB MMC is consisted of half the self-blocking sub-module (SBSM) and half the half bridge (HB) sub-module. This hybrid design achieves the DC fault isolation capability without significantly increase of the cost and power loss. The detailed electro-magnetic...
Power electronic converters play an important role in integrating renewable energy sources in to the electrical grid. A power conditioning unit (PCU) which comprises of different power electronic converters is essential to process the power of renewable energy sources and make it useable for stand-alone or grid-tied application. DC-DC converters are used in the primary stage of PCU to step up the...
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