scholarly journals Fault-Tolerant Control of Cascaded H-Bridge Converters Using Double Zero-Sequence Voltage Injection and DC Voltage Optimization

2014 ◽  
Vol 14 (5) ◽  
pp. 946-956 ◽  
Author(s):  
Zhendong Ji ◽  
Jianfeng Zhao ◽  
Yichao Sun ◽  
Xiaojun Yao ◽  
Zean Zhu
Keyword(s):  
Fault Tolerant ◽  
Fault Tolerant Control ◽  
Double Zero ◽  
Dc Voltage ◽  
Zero Sequence ◽  
Zero Sequence Voltage

scholarly journals A Novel Fault-Tolerant Control of Modular Multilevel Converter under Sub-Module Faults based on Phase Disposition PWM

Energies ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 20 ◽  
Author(s):  
Yin Jingyuan ◽  
Wen Wu ◽  
Wei Tongzhen ◽  
Wu Xuezhi ◽  
Huo Qunhai
Keyword(s):  
Control Strategy ◽  
Pulse Width Modulation ◽  
Fault Tolerant ◽  
Fault Tolerant Control ◽  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Modulation Wave ◽  
Zero Sequence ◽  
Simulation And Experiment ◽  
Zero Sequence Voltage

Each arm of modular multilevel converter (MMC) consists of a large number of sub-module (SM) units. However, it also increases the probability of SM failure during the long-term system operation. Focusing on the fault-tolerant operation issue for the MMC under SM faults, the traditional zero-sequence voltage injection fault-tolerant control algorithm is analyzed detailed and its disadvantages are concluded. Based on this, a novel fault-tolerant control strategy based on phase disposition pulse-width modulation (PD-PWM) is proposed in this paper, which has three main benefits: (i) it has carrier and modulation wave dual correction mechanism, which control ability is more higher and flexible；(ii) it only needs to inject zero-sequence voltage in half a cycle of the modulation wave, which simplifies the complexity of traditional zero-sequence voltage injection control algorithms and much easier for implement; (iii) furthermore, the zero-sequence voltage can even be avoided injecting under the symmetrical fault conditions. Finally, the effectiveness of the proposed control strategy is verified with the simulation and experiment studies under different fault conditions.

scholarly journals Improving the Performance of Doubly Fed Induction Generator Using Fault Tolerant Control—A Hierarchical Approach

2020 ◽  
Vol 10 (3) ◽  
pp. 924 ◽  
Author(s):  
Muhammad Shahzad Nazir ◽  
Yeqin Wang ◽  
Ali Jafer Mahdi ◽  
Xinguo Sun ◽  
Chu Zhang ◽  
...  
Keyword(s):  
Wind Speed ◽  
Wind Energy ◽  
Fault Tolerant ◽  
Short Circuit ◽  
Fault Tolerant Control ◽  
Induction Generator ◽  
Doubly Fed Induction Generator ◽  
Hierarchical Approach ◽  
Dc Voltage ◽  
Doubly Fed

The growth of using wind energy on a large scale increases the demand for wind energy conversion machines (WECMs), among these converters, the doubly-fed induction generator (DFIG) is the favorite choice. However, DFIG is very sensitive to wind speed variations and grid faults during operation. In order to overcome these undesirable characteristics, this paper proposes a hierarchical fault tolerant control (FTC) to improve the performance of DFIG. The hierarchical fault tolerant control (FTC) approach consists of pitch angle control (PAC) and maximum power point tracking (MPPT). This hierarchical approach demonstrates the robust response under various (low, rated, and high) wind speed ranges and reduces the undesirable DC voltage overshoots during short-circuit disorder. The simulation results are summarized in a logical table, which depicts the order of controlling scheme and operation for a sustainable energy generation system. The proposed control scheme achieved the healthy and the robust dynamic response without deteriorating the grid power quality or stressing the converters, and approved the effectiveness to suppress the DC voltage overshoots and tolerate the lower down short-circuit disorder to its rated range.

Zero‐sequence voltage injected fault tolerant scheme for multiple open circuit faults in reduced switch count‐based MLDCL inverter

2018 ◽  
Vol 11 (8) ◽  
pp. 1351-1364 ◽  
Author(s):  
Hari Priya Vemuganti ◽  
Dharmavarapu Sreenivasarao ◽  
Ganjikunta Siva Kumar
Keyword(s):  
Fault Tolerant ◽  
Open Circuit ◽  
Zero Sequence ◽  
Zero Sequence Voltage

scholarly journals Fault‐tolerant compensation control for T‐type three‐level inverter with zero‐sequence voltage injection

2019 ◽  
Vol 12 (14) ◽  
pp. 3774-3781
Author(s):  
Jianzhong Zhang ◽  
Lucai Hu ◽  
Shuai Xu ◽  
Fujin Deng
Keyword(s):  
Fault Tolerant ◽  
Compensation Control ◽  
Zero Sequence ◽  
Zero Sequence Voltage

A fault tolerant control method of EPS based on novel fault diagnosis

2015 ◽  
Author(s):  
S.L. Feng ◽  
H.X. Liu ◽  
X. Wang ◽  
F. Xiao ◽  
G.L. Wang
Keyword(s):  
Fault Diagnosis ◽  
Control Method ◽  
Fault Tolerant ◽  
Fault Tolerant Control
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