Journal articles: 'Current commutation'

1

Barber, J. P., T. D. Smith, and S. Foley. "Resistive commutation at megampere current levels." IEEE Transactions on Magnetics 25, no. 1 (1989): 75–78. http://dx.doi.org/10.1109/20.22508.

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Wang, Qi, Chaoming Zhang, Xingquan Wu, and Yi Tang. "Commutation Failure Prediction Method Considering Commutation Voltage Distortion and DC Current Variation." IEEE Access 7 (2019): 96531–39. http://dx.doi.org/10.1109/access.2019.2929301.

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Wang, Xiao Feng, and Wei Lin. "BLDCM Commutation Torque Ripple Strategy Optimization." Applied Mechanics and Materials 556-562 (May 2014): 2039–42. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.2039.

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First of all, this article creates the mathematical model of blushless DC Motor. Secondly, analysis the reduction theory of commutation torque ripple. Finally, put forward a strategy to reduce the commutation torque ripple from the low-speed level and high-speed level. This method guarantee equal between current decline rate of shutdown phase and current rising rate of opening phase during commutation, thus keep the current of un-commutation stable. Build a real brushless DC motor control platform for experimental verification, the proposed strategy of brushless DC motor commutation torque ripple is suppressed effectively.

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Liu, Tao, Tong Zhao, Liang Zou, Li Zhang, and Meng Qi Liu. "Diagnosis of Commutation Failures in HVDC System Based on Voltage or Current of the Converter Valve." Advanced Materials Research 960-961 (June 2014): 738–41. http://dx.doi.org/10.4028/www.scientific.net/amr.960-961.738.

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Commutation failure is one of the most common typical faults of HVDC, and it may result in subsequent commutation failures, even the outage of the HVDC system if without timely and effective regulatory measures. Trigger of the control measures depends on the rapid and accurate diagnosis of commutation failure. In-depth analysis of the commutation failure mechanism indicates its new substantive characteristics: valve voltage being continuously zero and valve current being continuous with high amplitudes, according to which a novel method for fault diagnosis of commutation failure based on voltage or current of the converter valve is proposed in this paper. Simulation results prove the accuracy and effectiveness of this method.

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5

Raja, M. Senthil, and B. Geethalakshmi. "Analysis and Implementation of a High Boost Ratio DC-DC Converter for Minimizing Commutation Torque Ripple in Brushless DC Motor." International Journal of Power Electronics and Drive Systems (IJPEDS) 7, no. 2 (2016): 583. http://dx.doi.org/10.11591/ijpeds.v7.i2.pp583-600.

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Brushless dc motor still suffers from commutation torque ripple, which primarily depends on transient line current in the commutation interval. In order to control the incoming and outgoing phase currents to change at the same rate during commutation, this paper presents a novel high boost ratio DC-DC circuit topology in the front end of the inverter. With a suitable closed loop control scheme, the proposed high boost ratio DC-DC converter is operated with two different duty ratios one during commutation period and the other during non commutation period. The cause of commutation ripple is analyzed, and the way to adjust the duty ratio for obtaining the desired dc link voltage is introduced in detail. Finally, simulation and experimental results show that, compared with the existing dc–dc converter topologies, the proposed method can obtain the desired voltage much faster and minimize commutation torque ripple more efficiently

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Avilov, V. D., and D. I. Popov. "Commutation in the direct current machines with rolling current collecting." Russian Electrical Engineering 79, no. 7 (2008): 366–69. http://dx.doi.org/10.3103/s1068371208070055.

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Jin, Chang-Sung, Chang-Min Kim, In-Jin Kim, and Iksang Jang. "Proposed Commutation Method for Performance Improvement of Brushless DC Motor." Energies 14, no. 19 (2021): 6023. http://dx.doi.org/10.3390/en14196023.

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This study focused on the efficiency improvement and acoustic noise reduction of brushless DC (BLDC) motors by reducing current harmonics using a novel BLDC commutation method. To achieve these goals, we designed an improved 150° commutation method for a three-phase permanent magnet BLDC motor that can improve the current waveform. Although the 120° commutation method is generally employed for BLDC motors, an improved 150° commutation method is introduced to operate the BLDC with increased efficiency and acoustic noise similar to a brushless AC motor. This study investigated the attributes of various commutation methods, both theoretically and experimentally, to determine the optimal commutation method. The results of this study indicate that the improved 150° commutation method is optimal in terms of harmonic attributes and reduced torque ripple, allowing it to improve motor efficiency and reduce acoustic noise.

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8

Li, Xinnian, Fengqi Li, Shuyong Chen, et al. "An Improved Commutation Prediction Algorithm to Mitigate Commutation Failure in High Voltage Direct Current." Energies 10, no. 10 (2017): 1481. http://dx.doi.org/10.3390/en10101481.

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Wang, Xiao Ming, Qi Zhang, and Bin Qian. "Reactive Power Compensation Method of HVDC Commutation Failure." Applied Mechanics and Materials 536-537 (April 2014): 1510–13. http://dx.doi.org/10.4028/www.scientific.net/amm.536-537.1510.

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In the high-voltage direct current transmission system, the difference value between the landing phase voltage and DC transmission system commutation failure of the critical voltage drop value, as system occurred in the critical value of commutation failure. When commutation voltage lower than the critical value would reduce arc Angle, caused by commutation failure。Therefore, by using the method of reactive power compensation to keep converter bus voltage stability, can avoid commutation failure.

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Ma, Xing He, Jun Ying Zhao, Li Jia, and Peng Fei Ji. "Study on Varying-Step Commutation Strategy of Matrix Converter." Applied Mechanics and Materials 143-144 (December 2011): 132–38. http://dx.doi.org/10.4028/www.scientific.net/amm.143-144.132.

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Aiming at safe commutation and improving quality of output waveform, the paper presents a new varying-step safe commutation strategy of matrix converter by analyzing the character of traditional four-step commutation and improved four-step commutation strategy. On the basis of input-voltage-based commutation this new strategy synthetically considers the magnitude of input voltage and output current direction and accordingly distinguishes the safe partition and the unsafe partition. Then different commutation strategies are adopted in different partition which improving the reliability of commutation and decreasing the commutation time to improve the quality of output waveform. Finally, the( ) experiment results demonstrate the availability and reliability of the presented commutation strategy. Thereby, the open-circuit or short-circuit faulty caused by abnormal commutation can be eliminated. The output waveform can be improved because the commutation time can be decreased by 2/3 compared to the traditional four-step commutation strategy.

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11

Xie, Hui Fan, Guang Yuan Yang, Guang Qiang Peng, et al. "Analysis on Commutation Failure and DC Differential Protection Unwanted Action of Yunnan-Guangdong UHVDC." Applied Mechanics and Materials 446-447 (November 2013): 784–89. http://dx.doi.org/10.4028/www.scientific.net/amm.446-447.784.

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In order to reveal the commutation failure process and the reason for DC differential protection (87DCM) unwanted action of Yunnan-Guangdong UHVDC in 9.12th 2012, and to lessen the unnecessary outage and guarantee a safe and stable operation, the 9.12 outage is deeply studied, including commutation failure phenomena and equivalent circuit analysis, high voltage DC current, low voltage DC current and their differential current analysis and reason for 87DCM unwanted action, and the final conclusions come out that: (1) 9.12 commutation failure includes V1 failing to communicate to V3 of Y bridge and V2 failing to communicate to V4 of D bridge; (2) during commutation failure process, high voltage DC current and low voltage DC current all raise rapidly and both contain DC component, AC component and no-circle rising component, and theoretically high voltage DC current equals to low voltage DC current; (3) failure in low pass filter circuit of pole 1 low voltage CT leads to measuring differential current between high voltage and low voltage DC current, and finally leads to unwanted action of 87DCM.

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12

Li, Xinmin, Guokai Jiang, Wei Chen, Tingna Shi, Guozheng Zhang, and Qiang Geng. "Commutation Torque Ripple Suppression Strategy of Brushless DC Motor Considering Back Electromotive Force Variation." Energies 12, no. 10 (2019): 1932. http://dx.doi.org/10.3390/en12101932.

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This paper presents a commutation torque ripple suppression strategy for brushless DC motor (BLDCM) in the high-speed region, which considers the back electromotive force (back-EMF) variation during the commutation process. In the paper, the influence of actual back-EMF variation on the torque and outgoing phase current during the commutation process is analyzed. A modified smooth torque mechanism is then reconstructed considering the back-EMF variation, based on which a novel torque ripple suppression strategy is further designed. Compared with the traditional strategy which controls the chopping duty cycle relatively smoothly in the commutation process, the proposed strategy dynamically regulates the chopping duty cycle, which makes it show a gradual decrease. This strategy can suppress the commutation torque ripple even in a long commutation process, and broaden the speed range of the commutation torque ripple reduction. Under the experimental conditions of this paper, the proposed strategy can effectively reduce the commutation torque ripple in the high-speed region, and avoid the outgoing phase current cannot be reduced to zero. The experimental results verify the correctness of the theoretical analysis and the feasibility of the proposed strategy.

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13

Song, Weizhang, Jiang Liu, Xiangdong Sun, Fenjun Wu, Daqing Gao, and Youyun Wang. "Research on Commutation and Coordination Control Strategy of Excitation Power Supply Based on Bidirectional Reduced Matrix Converter for Ion Accelerator." Energies 11, no. 12 (2018): 3396. http://dx.doi.org/10.3390/en11123396.

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The contribution of this paper is putting forward a kind of ion accelerator magnet excitation power supply with bidirectional reduced matrix converter (BRMC) as well as a coordination control strategy with bipolar current space vector modulation strategy, which is utilized to realize bidirectional power flow for a BRMC system to solve problems such as low input power factor, large input current harmonics and no bidirectional energy in the conventional ion accelerator magnet excitation power supply. Meanwhile, a hybrid commutation strategy combining the simplified three-step commutation with zero vector commutation was proposed to solve the commutation problem for a matrix-type first stage in BRMC. The feasibility and effectiveness of the proposed strategy, which can achieve bidirectional energy flow and safer commutation, have been verified by the experimental results.

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14

Usuba, S., Y. Kakudate, M. Yoshida, et al. "Study of high current commutation by explosive switch." IEEE Transactions on Magnetics 29, no. 1 (1993): 1082–87. http://dx.doi.org/10.1109/20.195731.

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15

Shugurov, Konstantin, Alexey Mozharov, Georgiy Sapunov, Vladimir Fedorov, Maria Tchernycheva, and Ivan Mukhin. "Single GaN Nanowires for Extremely High Current Commutation." physica status solidi (RRL) – Rapid Research Letters 15, no. 4 (2021): 2000590. http://dx.doi.org/10.1002/pssr.202000590.

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16

Rong, Jun Xiang, and Ju Rui Yang. "The Influence Analysis of Rectifier Side Control Mode on Commutation Failure in UHVDC." Applied Mechanics and Materials 631-632 (September 2014): 339–44. http://dx.doi.org/10.4028/www.scientific.net/amm.631-632.339.

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This paper studies the influence of different control modes in the rectifier side (constant current control, constant power control) on commutation failure in UHVDC transmission system. The study is based on Yunnan-Guangdong ±800kV UHVDC transmission system and simulated in PSCAD/EMTDC. A wealth of simulation results indicate that the control ability of the constant current control on commutation failure caused by the critical voltage ratio of inverter transformer increased is worse than the constant power control; the control ability of the constant current control on commutation failure caused by three-phase grounding fault happens at inverter side AC bus is worse than the constant power control; The control ability of the constant current control on commutation failure caused by phase to phase short circuit fault or single-phase ground fault happens at inverter side AC bus is worse than the constant power control.

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17

Wang, Dequan, Minfu Liao, Rufan Wang, et al. "Research on Vacuum Arc Commutation Characteristics of a Natural-Commutate Hybrid DC Circuit Breaker." Energies 13, no. 18 (2020): 4823. http://dx.doi.org/10.3390/en13184823.

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Vacuum arc commutation is an important process in natural-commutate hybrid direct current (DC) circuit breaker (NHCB) interruption, as the duration of vacuum arc commutation will directly affect the arcing time and interrupting time of NHCB. In this paper, the vacuum arc commutation model of NHCB was established by simplifying solid-state switch (SS) and vacuum arc voltage. Through theoretical analysis and experiments, the vacuum arc commutation characteristics of NHCB were studied. The mathematical formula of the effect of main parameters on the duration of vacuum arc commutation is obtained, and the changing law of the influence of the main parameters on the duration of the vacuum arc commutation is explored. The concept of vacuum arc commutation coefficient is proposed, and it is a key parameter that influences the vacuum arc commutation characteristics. The research on the characteristics of vacuum arc commutation can provide theoretical foundation for the structure and parameter optimization of NHCB and other equipment that uses vacuum arc commutation.

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18

Chen, Mo, Kyotaro Nakayama, Shungo Zen, and Koichi Yasuoka. "Threshold Current of Arc-Less Current Commutation in a Hybrid DC Switch." IEEE Transactions on Components, Packaging and Manufacturing Technology 9, no. 6 (2019): 1029–37. http://dx.doi.org/10.1109/tcpmt.2019.2915764.

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19

Wheeler, P. W., J. C. Clare, L. Empringharn, M. Bland, and M. Apap. "Gate drive level intelligence and current sensing for matrix converter current commutation." IEEE Transactions on Industrial Electronics 49, no. 2 (2002): 382–89. http://dx.doi.org/10.1109/41.993271.

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20

Stein, C. M. de O., H. L. Hey, J. R. Pinheiro, H. Pinheiro, and H. A. Gründling. "A new ZCZVT commutation cell for PWM DC-AC converters." Sba: Controle & Automação Sociedade Brasileira de Automatica 15, no. 2 (2004): 162–71. http://dx.doi.org/10.1590/s0103-17592004000200005.

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This paper proposes a new auxiliary commutation cell for PWM inverters that allows the main switches to be turned on and off at zero voltage and zero current. The main switches zero current turn-on reduces the undesired effects of parasitic inductances related to the circuit layout. The main diodes reverse recovery losses are minimized since di/dt and dv/dt are controlled. The ZCZVT commutation cell is located out of the main power path of the converters and is activated only during switching transitions. Additionally, the auxiliary switches are turned on and off at ZCS and use the same ground signals of the upper main switches. The commutation losses are practically reduced to zero. Soft switching operation is guaranteed for full load range without changes in command strategy. The operation of the ZCZVT PWM full-bridge DC-AC Converter is analyzed and an auxiliary commutation cell design procedure based on the analysis is proposed. Experimental results are presented to demonstrate the feasibility of the proposed commutation cell.

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21

Furman, Juliusz, and Andrzej Białoń. "Influence of Commutational Interferences on the Analysis of Harmonics in the Traction Current." Problemy Kolejnictwa - Railway Reports 64, no. 187 (2020): 87–97. http://dx.doi.org/10.36137/183e.

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Commutation phenomena related to the processes of changing the amount of power taken or returned by a vehicle affect the frequency spectrum contained within the traction current. The paper presents the influence of selected physical phenomena on the parameters taken for FFT analysis utilized for assessment of the disturbances generated into the traction network. The paper also describes the stands used for measuring disturbances generated into the traction network. The results of the measurements and calculations of the frequency response of simulated signals are presented, as well as signals measured in real conditions during traction vehicle tests, which are useful for assessing the influence of commutational interferences on the analysis of harmonics in the traction current. Keywords: interferences, EMC, traction, interoperability

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22

Ahfock, A., and D. Gambetta. "Sensorless commutation of printed circuit brushless direct current motors." IET Electric Power Applications 4, no. 6 (2010): 397. http://dx.doi.org/10.1049/iet-epa.2009.0133.

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23

Alferov, D., D. Yevsin, L. Fisher, V. Ivanov, and V. Sidorov. "Superconducting fault current limiter with fast vacuum commutation modulus." Journal of Physics: Conference Series 97 (February 1, 2008): 012084. http://dx.doi.org/10.1088/1742-6596/97/1/012084.

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24

Zhou, Hao, Can Su, and Hao Zhou. "An Evaluation Method for Commutation Failure Caused by Waveform Distortion." E3S Web of Conferences 256 (2021): 02033. http://dx.doi.org/10.1051/e3sconf/202125602033.

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Commutation failure is a key issue that affects the safe operation of HVDC transmission systems. Scholars at home and abroad have conducted research on the mechanism, evaluation indicators, and control strategies of commutation failure. However, most of the researches are aimed at the working conditions of commutation failure caused by a short-circuit fault on the AC side. There are few studies on the commutation failure caused by the harmonic injection on the AC side and the distortion of the AC bus voltage waveform. This paper clarifies the mechanism of commutation failure caused by waveform distortion, and proposes an index of harmonic commutation margin. On this basis, an evaluation method for commutation failure caused by waveform distortion is proposed. By predicting the commutation voltage-time area and optimization methods to assess whether the current voltage conditions have the risk of commutation failure. Finally, an electromagnetic transient simulation model is established on PSCAD/EMTDC, and the evaluation method in this chapter is verified by simulating the working conditions of the inverter side bus voltage waveform distortion. The results show its effectiveness in evaluating the commutation failure. The research provides a theoretical basis to the implementation of the control function and has broad engineering application prospects.

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25

Yao, Xuliang, Jicheng Zhao, Guangxu Lu, Hao Lin, and Jingfang Wang. "Commutation Error Compensation Strategy for Sensorless Brushless DC Motors." Energies 12, no. 2 (2019): 203. http://dx.doi.org/10.3390/en12020203.

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Sensorless brushless DC (BLDC) motor drive systems often suffer from inaccurate commutation signals, which result in current fluctuation and high conduction loss. To improve precision of commutation signals, this paper presents a novel commutation error compensation strategy for BLDC motors. First, the relationship between the line voltage difference integral in 60 electrical degree conduction interval and the commutation error is analyzed. Then, in terms of the relationship derived, a feedback compensation strategy based on the line voltage difference integral is proposed to regulate commutation signals by making three-phase back electromotive force (EMF) integral to zero, and the effect of the freewheeling process on the line voltage difference integral is considered. Moreover, an incremental PI controller is designed to achieve closed-loop compensation for the commutation error automatically. Finally, experiment results verify feasibility and effectiveness of the proposed strategy.

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26

Martins, M. L., H. Pinheiro, J. R. Pinheiro, H. A. Gründling, and H. L. Hey. "A family of improved ZVT PWM converters using an auxiliary resonant source." Sba: Controle & Automação Sociedade Brasileira de Automatica 14, no. 4 (2003): 412–21. http://dx.doi.org/10.1590/s0103-17592003000400009.

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This paper presents a novel family of Zero Voltage Transition (ZVT) DC-DC PWM Converters that uses a resonant circuit as auxiliary commutation source to control the current through the auxiliary switch without additional current stresses on main devices. The improved ZVT commutation cell enables the main switch to be turned on and off at Zero Voltage Switching (ZVS) and the auxiliary switch to be turned on and off at Zero Current Switching (ZCS) from zero to full-load.

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27

Buja, G., R. Menis, and R. Keshri. "Vector analysis of the current commutation in PM BLDC drives." Bulletin of the Polish Academy of Sciences: Technical Sciences 61, no. 4 (2013): 829–36. http://dx.doi.org/10.2478/bpasts-2013-0089.

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Abstract The vector approach in either stationary or synchronous plane is commonly used for the analysis of the AC drives like induction and PM brushless AC drives whilst it has been hardly ever used for the PM brushless DC (BLDC) drives. A possible reason is that they require injection of square-wave currents into the motor phases, which are non-sinusoidal in nature. Recently, the PM BLDC drives have been analyzed by the help of the vector approach in the stationary plane. This paper applies such an approach to an in-depth analysis of the operation of the PM BLDC drives during the current commutations, illustrating the potentialities of the approach in giving a better insight into the current transients and the ensuing torque characteristics. At last, two voltage control strategies proposed to eliminate the torque ripple due to the current commutations are considered, showing that they can be readily understood by the vector approach.

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28

Egorov, E. G., N. Yu Luiya, E. V. Mikhailova, V. N. Pichugin, R. V. Fedorov, and V. M. Zbrodiga. "Specifics of automatic switches commutation testing." E3S Web of Conferences 124 (2019): 03016. http://dx.doi.org/10.1051/e3sconf/201912403016.

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We demonstrate that the most efficient way to extinguish the short-circuit arc is extinguishing inside the camera with an arc extinguishing grid, which splits it into several smaller arcs. The active resistivity of these partial arcs decreases the amplitude of the current of the short-circuit arc, decreases the angle φ between current and voltage, which decreases the amplitude of the return current and enhances the condition for the arc extinguishing. We analyze the process of arc extinguishing in the three-phase circuit. We would like to note that during the extinguishing of the arc in the first extinguishing pole resistance of electric arcs in two other poles deforms the voltage triangle decreasing the coefficients of the scheme from 1.5 to 1.3 according to the experimental data. This allows to decrease the difficulty of the tests for maximum commutation capability. Simultaneously, we consider the necessity of the selection and regulation of the wave parameters (amplitude coefficient and normal mode) of the test circuit according to the standard for test preparation. Taking into account the decrease of the coefficient of the scheme and the real wave parameters will allow to objectively estimate commutation capability and to optimize the parameters pf the contact arc extinguishing system of an automated switch.

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29

Wu, Yifei, Yi Wu, Fei Yang, Mingzhe Rong, and Yang Hu. "A Novel Current Injection DC Circuit Breaker Integrating Current Commutation and Energy Dissipation." IEEE Journal of Emerging and Selected Topics in Power Electronics 8, no. 3 (2020): 2861–69. http://dx.doi.org/10.1109/jestpe.2019.2911103.

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Kim, Hyosung. "Capacitor Commutation Method for MVDC Hybrid Circuit Breakers." Designs 5, no. 2 (2021): 28. http://dx.doi.org/10.3390/designs5020028.

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The medium voltage DC (MVDC) type system can connect multiple terminals to a common MVDC bus, so it is possible to connect several renewable DC power sources to the common MVDC bus, but a DC circuit breaker is needed to isolate short circuit accidents that may occur in the MVDC bus. For this purpose, the concept of a hybrid DC circuit breaker that takes advantage of a low conduction loss contact type switch and an arcless-breaking semiconductor switch has been proposed. During break the hybrid switch, a dedicated current commutation device is required to temporarily bypass the load current flowing through the main switch into a semiconductor switch branch. Existing current commutation methods include a proactive method and a reverse current injection method by a LC (Inductor-capacitor) resonant circuit. This paper proposes a power circuit of a new MVDC hybrid circuit breaker using a low withstanding voltage capacitor branch for commutation and a sequence controller according to it, and verifies its operation through an experiment.

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Sha, Jiangbo, Chunyi Guo, Atiq Rehman, and Chengyong Zhao. "A Quantitative Index to Evaluate the Commutation Failure Probability of LCC-HVDC with a Synchronous Condenser." Applied Sciences 9, no. 5 (2019): 925. http://dx.doi.org/10.3390/app9050925.

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Since thyristor cannot turn off automatically, line commutated converter based high voltage direct current (LCC-HVDC) will inevitably fail to commutate and therefore auxiliary controls or voltage control devices are needed to improve the commutation failure immunity of the LCC-HVDC system. The voltage control device, a synchronous condenser (SC), can effectively suppress the commutation failure of the LCC-HVDC system. However, there is a need for a proper evaluation index that can quantitatively assess the ability of the LCC-HVDC system to resist the occurrence of commutation failures. At present, the main quantitative evaluation indicators include the commutation failure immunity index and the commutation failure probability index. Although they can reflect the resistance of the LCC-HVDC system to commutation failures to a certain extent, they are all based on specific working conditions and cannot comprehensively evaluate the impact of SCs on suppressing the commutation failure of the LCC-HVDC system under certain fault ranges. In order to more comprehensively and quantitatively evaluate the influence of SCs on the commutation failure susceptibility of the LCC-HVDC system under certain fault ranges, this paper proposes the area ratio of commutation failure probability. The accuracy of this new index was verified through the PSCAD/EMTDC. Based on the CIGRE benchmark model, the effects of different synchronous condensers on LCC-HVDC commutation failure were analyzed. The results showed that the new index could effectively and more precisely evaluate the effect of SCs on commutation failures. Moreover, the proposed index could provide a theoretical basis for the capacity allocation of SCs in practical projects and it could also be utilized for evaluating the impact of other dynamic reactive power compensators on the commutation failure probability of the LCC-HVDC system under certain fault ranges.

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Khatir, Mohamed, Sid-Ahmed Zidi, Mohammed-Karim Fellah, Samir Hadjeri, and Mohamed Flitti. "The Impact Study of a Statcom on Commutation Failures in an HVDC Inverter Feeding a Weak AC System." Journal of Electrical Engineering 63, no. 2 (2012): 95–102. http://dx.doi.org/10.2478/v10187-012-0014-x.

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The Impact Study of a Statcom on Commutation Failures in an HVDC Inverter Feeding a Weak AC SystemThe Static Synchronous Compensator (STATCOM) devices are pure power electronics devices that use voltage source, IGBT, IGCT or GTO based converters to generate reactive current. This paper illustrates the effect of STATCOM connected whit an HVDC inverter feeding a weak AC network, on the recovery from commutation failures following AC side disturbances. MATLAB/SIMULINK simulation results have demonstrated the robust performance of the proposed system based on the first CIGRÉ HVDC Benchmark model against commutation failures.

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33

TÜRKER, Türker, and Ihsan Obayes Khudhair KHUDHAIR. "A switched current controller with commutation delay compensation for the reduction of commutation torque ripple in BLDCM drives." TURKISH JOURNAL OF ELECTRICAL ENGINEERING & COMPUTER SCIENCES 25 (2017): 2635–46. http://dx.doi.org/10.3906/elk-1606-105.

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34

Koharagi, Haruo, Kazuo Tahara, Atsukata Koseki, Yasumi Saitoo, Nobutaka Suzuki, and Koozi Miki. "Improving equipment of the commutation quality of direct current machines." IEEJ Transactions on Industry Applications 108, no. 10 (1988): 942–48. http://dx.doi.org/10.1541/ieejias.108.942.

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35

Matsushita, Akihisa, Kazuyasu Takimoto, Kentaro Suzuki, Hiromichi Tai, Ryoichi Kurosawa, and Isao Kamiyama. "Experimental Verification of Current-Source Inverter With ZVS Commutation Circuit." IEEE Transactions on Industry Applications 46, no. 5 (2010): 2035–45. http://dx.doi.org/10.1109/tia.2010.2059650.

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36

Kimura, Noriyuki, Toshimitsu Morizane, Katsunori Taniguchi, and Hisaichi Irie. "Current Source Forced Commutation HVdc Converter with Immitance Conversion Link." IEEJ Transactions on Power and Energy 121, no. 12 (2001): 1770–76. http://dx.doi.org/10.1541/ieejpes1990.121.12_1770.

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37

Cho, G. H., and S. S. Park. "A new current source inverter with simultaneous recovery and commutation." IEEE Transactions on Industry Applications 25, no. 1 (1989): 162–71. http://dx.doi.org/10.1109/28.18886.

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38

Wen, Weijie, Yulong Huang, Yinshan Sun, Junhui Wu, Mohmmad Al-Dweikat, and Weidong Liu. "Research on Current Commutation Measures for Hybrid DC Circuit Breakers." IEEE Transactions on Power Delivery 31, no. 4 (2016): 1456–63. http://dx.doi.org/10.1109/tpwrd.2016.2535397.

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39

Wu, Yifei, Mingzhe Rong, Yi Wu, Fei Yang, and Qiang Yi. "Damping HVDC Circuit Breaker With Current Commutation and Limiting Integrated." IEEE Transactions on Industrial Electronics 67, no. 12 (2020): 10433–41. http://dx.doi.org/10.1109/tie.2019.2962475.

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40

Lo, Yu-Kang, Jian-Min Wang, and Kai-Jen Pai. "Improved Commutation Method for a Full-Bridge Current-Source Inverter." IEEE Transactions on Industrial Electronics 55, no. 2 (2008): 961–63. http://dx.doi.org/10.1109/tie.2007.896552.

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41

Jiang, Chunbing, and Chengyong Zhao. "A Current-Commutation DC Circuit Breaker with Adaptive Reclosing Capability." E3S Web of Conferences 256 (2021): 01020. http://dx.doi.org/10.1051/e3sconf/202125601020.

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DC faults are critical events in a flexible high-voltage dc (HVDC) grid. Thus, ensuring that the power system returns to normal operation rapidly and reliably after fault isolation is very important. This requires a HVDC breaker. In overhead line systems under temporary faults, reclosing is often required. However, once the dc circuit breaker (DCCB) is reclosed directly, the large second overcurrent may occur which could damage the power electronic devices. To avoid this problem, a current-commutation DC circuit breaker with adaptive reclosing capability is proposed. Compared with the traditional auto-reclosing strategy, the second damage under permanent fault condition can be avoided by the proposed DCCB, which can identify the fault property. Compared with the hybrid DCCB, the power electronic breaking branch composed of lots of IGBTs is replaced by the current-commutation branch, which is employed to interrupt bi-directional dc fault current. Moreover, bypassing branch is configured to reduce the energy dissipation of arrester and shorten the fault isolation time effectively. Finally, simulation cases in PSCAD /EMTDC verify the effectiveness and superiorities of the proposed DCCB.

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42

Ji, Yanpeng, Bin Li, and Jingcheng Sun. "Harmonic Analysis on Torque Ripple of Brushless DC Motor Based on Advanced Commutation Control." Journal of Control Science and Engineering 2018 (2018): 1–9. http://dx.doi.org/10.1155/2018/3530127.

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This paper investigates the relationship between current, back electromotive force (back-EMF), and torque for permanent-magnet brushless DC (PM BLDC) motors under advanced commutation control from the perspective of harmonics. Considering that the phase current is the influencing factor of both torque and torque ripple, this paper firstly analyzes the effects of advanced commutation on phase current and current harmonics. And then, based on the harmonics of the phase current and back-EMF, the torque harmonic expressions are deduced. The expressions reveal the relationship of harmonic order between the torque, phase current, and back-EMF and highlight the different contribution of individual torque harmonic to the total torque ripple. Finally, the proposed harmonic analysis method is verified by the experiments with different speed and load conditions.

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43

FIJALKOWSKI, BOGDAN T., and JAN W. KROSNICKI. "CONCEPTS OF ELECTRONICALLY-CONTROLLED ELECTROMECHANICAL/MECHANOELECTRICAL STEER-, AUTODRIVE- AND AUTOABSORBABLE WHEELS FOR ENVIRONMENTALLY-FRIENDLY TRI-MODE SUPERCARS." Journal of Circuits, Systems and Computers 04, no. 04 (1994): 501–16. http://dx.doi.org/10.1142/s0218126694000296.

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Concepts of the electronically-controlled electromechanical/mechanoelectrical Steer-, Autodrive- and Autoabsorbable Wheels (SA2W) with their brushless Alternating Current-to-Alternating Current (AC-AC), Alternating Current-to-Direct Current-Alternating Current (AC-DC-AC) and/or Direct Current-to-Alternating Current (DC-AC)/Alternating Current-to-Direct Current (AC-DC) macroelectronic converter commutator (macro-commutator) wheel-hub motors/generators with the Application Specific Integrated Matrixer (ASIM) macroelectronic converter commutators (ASIM macrocommutators) and Application Specific Integrated Circuit (ASIC) microelectronic Neuro-Fuzzy (NF) computer (processor) controllers (ASIC NF microcontrollers) for environmentally-friendly tri-mode supercars (advanced ultralight hybrids) have been conceived by the first author and designed by both authors with the Cracow University of Technology’s Automotive Mechatronics Research and Development (R&D) Team. These electromechanical/mechanoelectrical wheel-hub motors/generators, respectively, for instance, can be composed of the outer rotor with the Interior Permanent Magnet (IPM) poles and the inner stator that has the three-phase armature winding. The macroelectronic converter commutator establishes the AC-AC cycloconverter, AC-DC rectifier-DC-AC inverter and/or DC-AC inverter/AC-DC rectifier ASIM macrocommutator. The microelectronic NF computer (processor) controller establishes the ASIC microcomputer-based NF microcontroller. By adopting continuous semiconductor bipolar electrical valves in the high-power ASIM, it has been able to increase the commutation (switching) frequency and reduce harmonic losses of the electromechanical/mechanoelectrical wheel-hub motors/generators, respectively.

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44

He, Jun, Ke Wang, and Jiangang Li. "Application of an Improved Mayr-Type Arc Model in Pyro-Breakers Utilized in Superconducting Fusion Facilities." Energies 14, no. 14 (2021): 4383. http://dx.doi.org/10.3390/en14144383.

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Pyro-breaker, a fast-responding, highly reliable and explosive-driven circuit breaker, is utilized in several Quench Protection Systems (QPS). The commutation process and its parameters are the main technical considerations in the process of designing a new pyro-breaker. The commutation parameters, such as the commutation time and the current change rate, are not only determined by the electrical parameters of the commutation circuit but also the arc behavior during the operation. The arc behavior is greatly affected by the structure and the driving mechanism of the Commutation Section (CS) in the pyro-breaker. The arc model was developed decades ago and the black-box arc model is considered a valid method to study arc behavior. In this paper, the Schavemaker black-box arc model, an improved Mayr-type arc model, is applied to study the commutation process of a newly designed pyro-breaker. Unlike normal circuit breakers, the arc discussed in this paper is discharged in deionized water. A parameter selection method is proposed. The practicability of the method is verified by numerical calculation in Power Systems Computer Aided Design (PSCAD) and experimentally.

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45

Sarala, P., S. F. Kodad, and B. Sarvesh. "Power Factor Correction with Current Controlled Buck Converter for BLDC Motor Drive." International Journal of Power Electronics and Drive Systems (IJPEDS) 8, no. 2 (2017): 730. http://dx.doi.org/10.11591/ijpeds.v8.i2.pp730-738.

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Brushless DC motor is a synchronous machine that makes use of electronic commutation instead of mechanical commutator. Brushless DC motors makes use of inverter encompassing static switches for its operation. A simple bridge converter when used for BLDC drive as front end converter makes input source power factor to get reduced which is unacceptable in the power system. To avoid the distortions in the source voltage and source currents, Buck converter which was used as power factor correction (PFC) converter in this paper to improve the power factor. Presence of power electronic converters deteriorates system power factor effecting overall system performance. This paper presents buck converter for power factor correction in brushless DC motor drive system. Buck converter is operated with current control strategy rather to conventional voltage follower control. Simulation model was obtained using MATLAB/SIMULINK software and the brushless DC motor performance characteristics were shown for conditions with different DC link voltages and step variation in DC link voltage. Total harmonic distortion in source current was also presented.

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46

Yamamoto, H., H. Iwamoto, M. Yoshida, E. Hiraki, and M. Nakaoka. "Space Vector Modulated Three Phase Voltage Source Soft Commutation Inverter with Pulse Current Transformerassisted Active Auxiliary Resonant Commutation Snubbers." IEEJ Transactions on Industry Applications 121, no. 7 (2001): 823–24. http://dx.doi.org/10.1541/ieejias.121.823.

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47

Merchan-Villalba, Luis Ramon, Jose Merced Lozano-Garcia, Diego Armando de Jesus Gutierrez-Torres, Juan Gabriel Avina-Cervantes, and Alejandro Pizano-Martinez. "Four-Step Current Commutation Strategy for a Matrix Converter Based on Enhanced-PWM MCU Peripherals." Electronics 8, no. 5 (2019): 547. http://dx.doi.org/10.3390/electronics8050547.

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In this paper, an efficient implementation of the four-step current commutation technique for controlling bidirectional power switches in a Matrix Converter (MC) is proposed. This strategy is based on the enhanced pulse width modulation peripheral included in the C 2000 Delfino 32-bit microcontroller of Texas Instruments. By tuning the algorithmic parameters contained in this module, the four-step commutation process is carried out on the Microcontroller Unit (MCU) without overloading the full complex processor and avoiding the use of additional special hardware such as Field-Programmable Gate Arrays (FPGA) or Complex Programmable Logic Devices (CPLD) when controlling the MC. The algorithm is implemented on the TMS320F28379D MCU and operationally validated on an MC prototype, where the functionality of the proposal is demonstrated.

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48

Geury, Thomas, Sonia Ferreira Pinto, Johan Gyselinck, and Patrick Wheeler. "Indirect Matrix Converter-Based Grid-Tied Photovoltaics System for Smart Grids." Energies 13, no. 20 (2020): 5405. http://dx.doi.org/10.3390/en13205405.

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This paper proposes an Indirect Matrix Converter (IMC)-based grid-tied Photovoltaic (PV) system for Smart Grids (SGs). The PV array injects current in the ‘dc link’ of the IMC through an inductive link, and is connected to the SG with shunt and series connections, allowing for the compensation of current- and voltage-related Power Quality (PQ) issues, respectively, for the sensitive loads and the SG connection. A direct sliding mode-based controller is proposed to guarantee nearly sinusoidal currents in the connection to the SG, and sinusoidal voltages guaranteeing compliance with international standards, when supplying the sensitive loads. Additionally, a novel control approach for the ‘dc link’ voltage is synthesised to allow for the control of both the PV array current and the power flow to the SG. To guarantee the semiconductors safe commutation an asynchronous commutation strategy is derived. Simulation and experimental results show that the proposed system significantly improves PQ in the SG, minimizing the total harmonic distortion of the currents injected in the SG, and guaranteeing the quality of the voltage supplied to the sensitive loads, even in the occurrence of voltage sags or overvoltages.

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49

Hung-Chi Chen and Chang-Ming Liaw. "Current-mode control for sensorless BDCM drive with intelligent commutation tuning." IEEE Transactions on Power Electronics 17, no. 5 (2002): 747–56. http://dx.doi.org/10.1109/tpel.2002.802176.

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50

Fang Deng. "Commutation-caused eddy-current losses in permanent-magnet brushless DC motors." IEEE Transactions on Magnetics 33, no. 5 (1997): 4310–18. http://dx.doi.org/10.1109/20.620440.

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Journal articles on the topic 'Current commutation'

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