Open-circuit Fault Diagnosis Strategy For Modular Multilevel Converter Semiconductor Power Switches

Haredasht, M. Rahmani; Barakati, S. Masoud; Darmian, S. Yousofi; Hashkavayi, M. Bagheri; Barahouei, Vahid

doi:10.1109/pedstc53976.2022.9767349

Cited by 9 publications

(3 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Because of equipment flaws in the capacitor manufacture process and their varying capacities, each Sub capacitor requires the proportion coefficient. According to Equation (17), λ y may vary between À0.2 and 0.2; therefore, (1 + λ y ) will set a positive coefficient for the capacitance value.…”

Section: Proposed Sorting Methods To Remove Current Sensorsmentioning

confidence: 99%

“…Because all voltage sensors are present in these studies, no estimation method is used, and the fault in each sub can be detected in each sampling time. Gradually, previous studies 14,17,33 apply various methods and Sub configurations to reduce the voltage sensors in half and detect faults in each sub. These studies make use of traditional sorting processes, and the presence of current sensors is required 23 …”

Section: The Proposed Methods Of MMC Arm Voltage Balancingmentioning

confidence: 99%

“…[12][13][14][15][16] Gradually, various studies have presented estimation methods for determining the voltage of capacitors in each processing cycle by using the previous cycle's data of switching signals and capacitor voltages, thereby reducing the number of required sensors and the hardware complexity of the system. 17,18 In Yin et al and Hu et al, 19,20 the current sensors are eliminated, but all voltage sensors are present on the sub-modules (Subs). These methods with many voltage sensors will complicate the system and degrade its reliability in real power grids.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An improved method to sub‐module voltage balancing in modular multilevel converters with two voltage sensors

Hashkavayi

Barakati

Torabi

et al. 2023

Circuit Theory & Apps

Self Cite

View full text Add to dashboard Cite

Summary The modular multilevel converter (MMC) is an innovative structure that has expanded the usage of multilevel converters (MLCs) in the electrical industry. Since the MMC initially required a large number of sensors to manage the capacitor voltages, various studies have been done to reduce their number to improve the converter's reliability and reduce construction costs. In this paper's proposed method, merely two voltage sensors are used to balance the converter's capacitor voltages, and voltages are estimated using the exponentially weighted recursive least square (RLS) method in each sampling time. Also, the estimated voltages are sorted according to the capacitor current sign determined by the voltage sensors, and the current sensors are entirely eliminated. Furthermore, three cases for compensating the capacitor estimated voltages are presented, and the last case proposes the sub‐module force algorithm (SFA) for system protection. The efficacy of the proposed method has been assessed via simulation and experimental implementations.

show abstract

Section: Proposed Sorting Methods To Remove Current Sensorsmentioning

confidence: 99%

Section: The Proposed Methods Of MMC Arm Voltage Balancingmentioning

confidence: 99%