A Fault-Tolerant Hybrid Cascaded H-Bridge Multilevel Inverter

Mhiesan, Haider; Wei, Yuqi; Siwakoti, Yam P.; Mantooth, H. Alan

doi:10.1109/tpel.2020.2996097

Cited by 90 publications

(36 citation statements)

References 46 publications

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“…Another advantage of the control is its low power design. A comparison table from earlier state-of-art research from other studies [26][27][28][29][30][31][32][33][34][35] presented in Table 6. The proposed structure uses comparatively more number of semiconductor switches, but the rating of switches remains same.…”

Section: Comparison With Other Ft Structurementioning

confidence: 99%

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Performance analysis of novel fault‐tolerant multilevel inverter with a pristine methodology for fast and exhaustive real‐time failure of switches

Anand

Singh

2021

Circuit Theory & Apps

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Multilevel inverter (MLI) provides a high power density, though the number of devices increases the chances of failures increases, reducing the reliability of power converter. It is essential to detect, isolate, and reconfigure the faults which arises in MLI. The research proposed here is capable of accomplishing the complete fault tolerance against single and multiple devices for both open circuit and short circuit faults. The control algorithm for operation of singlepole-double-throw (SPDT) relays. This methodology is capable of completely preserving the normal operating condition in post-fault condition also. The output voltage waveform matches by voltage sensors connected across load, and the controllers sense the faults originated from the variation in the look-up-table (LUT) and also categorize the nature of the faults. Fieldprogrammable gate array (FPGA)-based controller sends a command signal through SPDT to isolate the faulty switches by redundant switches. In this way, the output power across the load is preserved. This research article also covers the comparative study that is made with the existing fault-tolerant structures. The reliability comparison shows the better performance indices over conventional cascaded H-bridge (CHB) inverter. The simulation and experimental results validate the effectiveness of control methodology to achieve complete fault tolerance.

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Section: Comparison With Other Ft Structurementioning

confidence: 99%

“…The switching stresses are also high. In Mhiesan et al, 32 the authors have proposed the FT structure only for the level generation unit. The authors didn't consider the external polarity generation (H-bridge) where stresses on switches is highest.…”

Section: Comparison With Other Ft Structurementioning

confidence: 99%

Performance analysis of novel fault‐tolerant multilevel inverter with a pristine methodology for fast and exhaustive real‐time failure of switches

Anand

Singh

2021

Circuit Theory & Apps

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“…The researchers have also tried to solve the issue of reliability of modification in the topology. In [22] an additional cross coupled CHB MLI unit is incorporated in CHBMLI to increase the reliability. The increase in reliability also causes increase in cost.…”

Section: Introductionmentioning

confidence: 99%

Fault detection technique for modified cascaded half-bridge multi-level inverter with polarity changer in pv grid system

Vyas

Shah

Srivani³

2021

SN Appl. Sci.

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Multilevel Inverters (MLI) are a viable option for a filter-less and transformerless photovoltaic system for direct grid integration, reducing losses, space and cost provided the issues of control and reliability are resolved. A modified cascaded half-bridge MLI with polarity changer is proposed with a reduced number of switches, thereby reducing control complexity. The proposed converter is designed for both seven-level and nine-level topologies. Selective harmonic elimination has been adopted to switch converter and the transcendental equations are solved by the gravitational search algorithm. The THD for nine-level configuration is 7.94% and 5.86% with MPPT and DC source inputs, respectively. The analysis on the open-circuit fault of switches confirms the presence of only five critical switches irrespective of the number of increase in levels, thereby requiring only five redundant switches at the Polarity Changer. The output voltage waveform is subjected to multiresolution analysis for feature extraction of voltages under various irradiance and temperature conditions. A conditions based fault detection algorithm is developed based on the observations of energies of signals to detect the open circuit fault in switches. Based on the comparative analysis, the proposed converter has fewer controlled switches for nine levels or higher configurations than other topologies. Apart from this, the high reliability due to inherent fault isolation capability restricted to half-bridge compared to different MLI topologies shows its superiority. For a nine-level MLI proposed topology reduces the cost considering redundancies for FDI in range of 67–30% depending on the topology for comparision. The system is simulated using MATLAB –Simulink and further validated by experimental results.

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“…The discrete nature of FS-MPC allows its direct implementation and eliminates the PWM need. The FS-MPC is discussed widely in the literature for controlling DC-DC and AC-DC converters [12][13][14][15], multilevel converters such as packed U-cell (PUC) [9], and flying capacitor-based ANPC hybrid converters in [16]. The FS-MPC comprises finite control actions, among which the optimal control action is attained by solving optimization problem [11].…”

Section: Introductionmentioning

confidence: 99%

A Novel Control Approach to Hybrid Multilevel Inverter for High-Power Applications

et al. 2021

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This paper proposes a hybrid control scheme for a newly devised hybrid multilevel inverter (HMLI) topology. The circuit configuration of HMLI is comprised of a cascaded converter module (CCM), connected in series with an H-bridge converter. Initially, a finite set model predictive control (FS-MPC) is adopted as a control scheme, and theoretical analysis is carried out in MATLAB/Simulink. Later, in the real-time implementation of the HMLI topology, a hybrid control scheme which is a variant of the FS-MPC method has been proposed. The proposed control method is computationally efficient and therefore has been employed to the HMLI topology to mitigate the high-frequency switching limitation of the conventional MPC. Moreover, a comparative analysis is carried to illustrate the advantages of the proposed work that includes low switching losses, higher efficiency, and improved total harmonic distortion (THD) in output current. The inverter topology and stability of the proposed control method have been validated through simulation results in MATLAB/Simulink environment. Experimental results via low-voltage laboratory prototype have been added and compared to realize the study in practice.

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A Fault-Tolerant Hybrid Cascaded H-Bridge Multilevel Inverter

Cited by 90 publications

References 46 publications

Performance analysis of novel fault‐tolerant multilevel inverter with a pristine methodology for fast and exhaustive real‐time failure of switches

Performance analysis of novel fault‐tolerant multilevel inverter with a pristine methodology for fast and exhaustive real‐time failure of switches

Fault detection technique for modified cascaded half-bridge multi-level inverter with polarity changer in pv grid system

A Novel Control Approach to Hybrid Multilevel Inverter for High-Power Applications

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