scholarly journals A Remedial Control for Short-Circuit Fault in NPC/H-Bridge Inverters without Redundant Component

Electronics ◽  
2021 ◽  
Vol 10 (19) ◽  
pp. 2411
Author(s):  
Sajjad Ahmadi ◽  
Philippe Poure ◽  
Davood Arab Khaburi ◽  
Shahrokh Saadate
Keyword(s):  
Fault Tolerant ◽  
Short Circuit ◽  
Harmonic Content ◽  
Service Continuity ◽  
Power Switches ◽  
Remedial Actions ◽  
Terminal Voltage ◽  
Redundant Component ◽  
Bidirectional Switches ◽  
Short Circuit Fault

In this paper, a five-level neutral-point-clamped (NPC) inverter with short-circuit fault-tolerant capability is presented. Based on the proposed approach, in order to ensure service continuity subsequent to a short-circuit fault event in a switch, two steps are carried out. First of all, destructive consequences arising from short-circuit fault in a power switch is prevented. Afterwards, according to the defected component, remedial actions are taken. The proposed strategy does not require any redundant component. The service continuity is acquired by applying a remedial control and modifying switching commands applied to the power switches. Using the proposed approach helps to restore the rated voltage and rated current at the terminal, and there is no limit for modulation index during fault-tolerant operation under remedial control. Furthermore, compared to healthy operation, harmonic content of the terminal voltage and current is not deteriorated during fault-tolerant operation. Moreover, additional components, such as bidirectional switches and contactors, are not employed in this strategy. Only some fast fuses are placed in the converter circuit for protection purposes which do not impose a noticeable cost compared to the bidirectional switches and contactors.

scholarly journals A Hybrid MMC Topology with dc Fault Ride-Through Capability for MTDC Transmission System

2015 ◽  
Vol 2015 ◽  
pp. 1-11
Author(s):  
Xinhan Meng ◽  
Ke-Jun Li ◽  
Zhuodi Wang ◽  
Wenning Yan ◽  
Jianguo Zhao
Keyword(s):  
Short Circuit ◽  
Harmonic Distortion ◽  
Transmission System ◽  
Simulation Software ◽  
Power System Simulation ◽  
Multilevel Converter ◽  
Harmonic Content ◽  
Dc Fault ◽  
Fault Ride Through ◽  
Short Circuit Fault

This paper proposes a hybrid modular multilevel converter (MMC) topology based on mismatched-cascade mechanism. The blocking conditions of different submodule (SM) structures under dc fault are analyzed and a series double submodule is presented. With series-double submodules and mismatched-cascade submodules, the proposed hybrid MMC can ride-through the dc side short-circuit fault and provide an output voltage with the feature of low harmonic content. This hybrid MMC topology can be used in the VSC based multiterminal dc (VSC-MTDC) transmission system. The dc fault ride-through properties of the new structure and the total harmonic distortion (THD) are analyzed compared with the previous full-bridge and clamp-double architectures. An appropriate fault blocking procedure is presented, and a typical four-terminal dc transmission simulation system is given in the power system simulation software. Finally, simulation of steady-state and dc bipolar short-circuit fault verifies that the MTDC system based on this new hybrid MMC topology is stabilized and can block the dc fault and return the nonfault parts to normal.

Research of SC for Improving LVRT Capability of FSIG

2012 ◽  
Vol 512-515 ◽  
pp. 758-762
Author(s):  
Guo Qing Li ◽  
Li Meng Wang
Keyword(s):  
Wind Power ◽  
Reactive Power ◽  
Short Circuit ◽  
Wind Farms ◽  
Mathematic Model ◽  
Point Of Common Coupling ◽  
Fast Development ◽  
Terminal Voltage ◽  
Common Coupling ◽  
Short Circuit Fault

The fast development of wind power generation brings new requirements for wind turbine integration to grid. In order to improve the lower voltage ride through(LVRT) capability of fixed speed induction generator(FSIG) in wind power generating systems, the mathematic model of FSIG, supercapacitor(SC) and converter is built in DIgSILENT in this paper. A control strategy for FSIG and SC based on wind farms is proposed to enhance the terminal voltage of point of common coupling (PCC) after the clearance of an external short circuit fault. The simulation results show that the terminal voltage of PCC can be significantly improved when there is extra active and reactive power compensation available from SC.

Research on Stator Winding Inter Turn Short-Circuit Faults of Aeronautical Fault-Tolerant Machine Based on Maxwell 2D

2011 ◽  
Vol 130-134 ◽  
pp. 119-123
Author(s):  
Ming Zhang ◽  
Yi Ming Zhang ◽  
Jiang Tao Tong
Keyword(s):  
Fault Tolerant ◽  
Short Circuit ◽  
Fault Model ◽  
Stator Winding ◽  
High Power Density ◽  
Induced Voltage ◽  
Magnetic Field Simulation ◽  
Voltage Frequency ◽  
Solid Foundation ◽  
Short Circuit Fault

Stator winding inter turn short-circuit fault is one of the most common internal faults of fault-tolerant machine, which can disconnect the fault phases and keep operating correctly in the event of a failure. Stator winding short-circuit fault model is established through analysis. Based on finite element method, the high-power density fault-tolerant machine internal magnetic field simulation and analysis is implemented using Maxwell2D and induced voltage frequency spectrum is analyzed by FFT method. The characteristics of stator winding short-circuit faults are summarized, which lay a solid foundation for fault-tolerant machine earlier faults prediction and winding switching.

scholarly journals An Intelligent Electronic Fuse (iFuse) to Enable Short-Circuit Fault-Tolerant Operation of Power Electronic Converters

2020 ◽  
Author(s):  
Alber Filba-Martinez ◽  
Salvador Alepuz ◽  
Sergio Busquets-Monge ◽  
Adria Luque ◽  
Josep Bordonau
Keyword(s):  
Fault Tolerant ◽  
Short Circuit ◽  
Failure Detection ◽  
Experimental Tests ◽  
Power Electronic Converters ◽  
Novel Device ◽  
Current Path ◽  
In Series ◽  
Short Circuit Fault ◽  
Short Circuit Currents

The present paper proposes a novel device defined as an intelligent electronic fuse (iFuse) meant to be connected in series with any current-bidirectional voltage-unidirectional active switch present in a given converter. The iFuse duty is to isolate its series- associated switch from the rest of the converter circuit immediately after detecting that said switch has failed in short circuit. Nonetheless, it maintains the reverse (free- wheeling) current path originally offered by the failed switch. The failure detection is performed when the failed switch causes a shoot-through event. Therefore, the iFuse is designed to be able to block the elevated current occurring in such event. The iFuse allows increasing the fault-tolerant capability and the reliability of power converters where such qualities are hindered by switch short-circuit failures, as in converters featuring parallelized switches, neutral-point-clamped multilevel topologies, or redundant legs. The feasibility of the iFuse device is verified through experimental tests, proving that the device is able to detect the failure of its associated switch and isolate it from the rest of the converter circuit in 6 μs, while stopping short-circuit currents of up to 1 kA without incurring in harmful di/dt values.

Sign in / Sign up

Export Citation Format

Share Document