Three-Phase and Five-Phase Motor Windings Common Point Potential Ripple with Respect to the Converter Zero Termina

Vestnik MEI ◽  
2021 ◽  
Vol 2 (2) ◽  
pp. 51-59
Author(s):  
Vladimir M. Tereshkin ◽  
◽  
Irshat L. Aitov ◽  
Dmitriy A. Grishin ◽  
Vyacheslav V. Tereshkin ◽  
...  
Keyword(s):  
Amplitude Modulation ◽  
Zero Point ◽  
Space Time ◽  
Common Point ◽  
Point Potential ◽  
Voltage Vector ◽  
Three Phase ◽  
Ripple Amplitude ◽  
The Common ◽  
Rotating Field

The aim of the study is to determine the parameters characterizing the ripple of a motor's three- and five-phase windings common point potentials (for the star winding connection diagram) with respect to the converter zero point. One of the reserves for decreasing electromagnetically induced vibration of an electric motor with a rotating field is to increase the number of working winding phases. The study subject is a five-phase motor winding connected to a bridge converter, namely, its ability to reduce electromagnetically induced vibration in comparison with that in using a three-phase winding. The common point potential ripple parameters are studied, and an approach is proposed to estimating the amplitude modulation of the space-time voltage vector of three- and five-phase windings under the influence of the common point potential ripple with respect to the converter zero point. Theoretical studies were carried out using the Fourier series expansion method and vector analysis methods. To confirm the theoretical results, experimental studies of the prototypes of three-phase and five-phase synchronous motors with inductors made on the basis of permanent magnets were carried out. The main results have shown the following. With increasing the number of phases of the rotating field motor working winding connected to a bridge converter, the common point potential ripple amplitude with respect to the converter zero point decreases, and the ripple frequency increases. The product of ripple amplitude by frequency remains unchanged. It is assumed that the common point potential ripple of the motor multiphase winding with respect to the converter zero terminal results in the amplitude modulation of the space-time voltage vector. With increasing the number of winding phases, the modulation amplitude decreases, and the modulation frequency increases. A five-phase motor has a lower level of the working winding common point potential ripple with respect to the converter zero point in comparison with a three-phase motor. Thus, it can be assumed that there will be a lower level of electromagnetically induced vibration in using a simple converter operation algorithm. The obtained results can be used in designing electric traction systems with vector control on the basis of multiphase motors. With increasing the number of phases, the common point potential ripple amplitude in a multiphase winding with respect to the converter zero point decreases, and the ripple frequency increases. Thus, the common point potential ripple amplitude in a five-phase winding is 5/3 times less than that in a three-phase winding, and the ripple frequency increases by 5/3 times, respectively. With increasing the number of working winding phases, the amplitude modulation of the resulting space-time voltage vector decreases. This circumstance has a positive effect on decreasing the electromagnetically induced vibration.

scholarly journals A Method for the Simultaneous Suppression of DC Capacitor Fluctuations and Common-Mode Voltage in a Five-Level NPC/H Bridge Inverter

Energies ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 779 ◽  
Author(s):  
Ming Wu ◽  
Zhenhao Song ◽  
Zhipeng Lv ◽  
Kai Zhou ◽  
Qi Cui
Keyword(s):  
Pulse Width Modulation ◽  
Neutral Point ◽  
Common Mode ◽  
Mapping Algorithm ◽  
Common Mode Voltage ◽  
Point Potential ◽  
Voltage Vector ◽  
Three Phase ◽  
Simulation And Experiment ◽  
The Common

To suppress the direct current (DC) capacitor voltage fluctuations and the common-mode voltage (CMV) in a three-phase, five-level, neutral-point-clamped (NPC)/H-bridge inverter, this paper analyzes the influence of all voltage vectors on the neutral point potential of each phase under different pulse mappings in detail with an explanation of the CMV distribution. Then, based on the traditional space vector pulse width modulation (SVPWM) algorithm, a dual-pulse-mapping algorithm is proposed to suppress the DC capacitor fluctuations and the CMV simultaneously. In the algorithm, the reference voltage synthesis selects the voltage vector that has the smallest CMV value as the priority. In addition, the two kinds of pulse mappings that have opposite effects on the neutral point potential are switched to output. At the same time, regulating factors are introduced to adjust the working time of each voltage vector under the two pulse mappings; then, the capacitor voltages can be balanced. Both the simulation and experiment demonstrate the algorithm’s effectiveness.

scholarly journals Opposite Triangle Carrier with SVPWM for Common-Mode Voltage Reduction in Dual Three Phase Motor Drives

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 282
Author(s):  
Seon-Ik Hwang ◽  
Jang-Mok Kim
Keyword(s):  
Electromagnetic Interference ◽  
Pulse Width Modulation ◽  
Motor Drives ◽  
Common Mode ◽  
Pwm Inverter ◽  
Common Mode Voltage ◽  
Voltage Vector ◽  
Three Phase ◽  
The Common ◽  
Zero Voltage

The common-mode voltage (CMV) generated by the switching operation of the pulse width modulation (PWM) inverter leads to bearing failure and electromagnetic interference (EMI) noises. To reduce the CMV, it is necessary to reduce the magnitude of dv/dt and change the frequency of the CMV. In this paper, the range of the CMV is reduced by using opposite triangle carrier for ABC and XYZ winding group, and the change in frequency in the CMV is reduced by equalizing the dwell time of the zero voltage vector on ABC and XYZ winding group of dual three phase motor.

Research on Two-Stage Three-Phase Photovoltaic Grid-Connected System

2012 ◽  
Vol 535-537 ◽  
pp. 1247-1251
Author(s):  
Xiao Jie Zhou ◽  
Yi Ruan
Keyword(s):  
Vector Control ◽  
Control Strategy ◽  
Common Point ◽  
Theoretic Analysis ◽  
Two Stage ◽  
Pv Systems ◽  
Current Vector ◽  
Three Phase ◽  
Pi Controllers ◽  
The Common

Nowadays the penetration of PV-generated power energy into the utility grid is increasing exponentially. This paper focuses on two-stage three-phase grid-connected PV systems, which includes modeling of three-phase grid-connected PV systems, grid-connected control strategy of inverter. The inverter based on the grid-voltage oriented vector control used SVPWM-based synchronous current vector PI controllers to control the grid-current of the common point in three-phase grid-connected system. Theoretic analysis and experimental results on a 2.5KW prototype verify the presented algorithm.

scholarly journals Research on SVPWM Method and its Neutral Point Potential Control

2011 ◽  
Vol 2-3 ◽  
pp. 39-42
Author(s):  
Yan Liu ◽  
Xu Wang ◽  
Yan Xing
Keyword(s):  
Passive Control ◽  
Balance Control ◽  
Neutral Point ◽  
Superior Performance ◽  
Voltage Source ◽  
Effective Control ◽  
Potential Control ◽  
Point Potential ◽  
Voltage Vector ◽  
Three Phase

Neutral-point potential unbalance is an inherent problem of Neutral-point-clamped three-level PWM rectifiers. If the problem of neutral point can’t be controlled appropriately, the harm of input current will increase, and even the dc-link capacitor and switches will be destroyed. Thus domestic and foreign experts have done lots of research on the balance control of Neutral-point-clamed and put forward many effective control methods. This paper proposes a novel SVPWM strategy for the three-level neutral-point-clamped voltage source inverter, based on the particular disposition of all the redundant voltage vectors. The new modulation approach shows superior performance for the harmonic voltage and the control of neutral-point potential compared to the popular eight-stage centered SVPWM and realizes the balancing control of inverter neutral-point potential by modifying redundant small vectors pairs’ distribution factor accurately, only requiring the information of dc-link capacitor voltages and three-phase load currents, which is convenient to apply and is compatible of digital computer realization. The feasibility of the proposed control approach has been verified via simulation and experiment results. In the strategy of software control, domestic and foreign scholars propose numerous neutral point potential control schemes. When carrier modulation is used, the balance control is achieved by injecting zero-sequence component into the three-phase modulated wave. When space vector modulation methods are adopted, they can be divided into three categories: passive control, hysteresis control and active control. there is also a new algorithm based on the intrinsic relationship between SVPWMs for two—level inverters and three．1evel inverters．a novel SVPWM control algorithm is proposed for three．1evel．The dwell time of voltage vector for three-level inverter can be acquired from counterpart for two-level inverter by using a linear transformation．Aiming to analysis the output PWM sequence of three-level inverter, a novel classification standard of voltage vector is proposed．Based on evaluating the PWM sequences, a novel PWM sequence is given，that can reduce the total harmonics distortion of inverter output.

scholarly journals Zebrafish Models to Study New Pathways in Tauopathies

2021 ◽  
Vol 22 (9) ◽  
pp. 4626
Author(s):  
Clément Barbereau ◽  
Nicolas Cubedo ◽  
Tangui Maurice ◽  
Mireille Rossel
Keyword(s):  
Cognitive Deficits ◽  
Tau Protein ◽  
Common Point ◽  
Transgenic Models ◽  
Synaptic Loss ◽  
Wide Range ◽  
Transgenic Lines ◽  
Functional Consequences ◽  
The Common

Tauopathies represent a vast family of neurodegenerative diseases, the most well-known of which is Alzheimer’s disease. The symptoms observed in patients include cognitive deficits and locomotor problems and can lead ultimately to dementia. The common point found in all these pathologies is the accumulation in neural and/or glial cells of abnormal forms of Tau protein, leading to its aggregation and neurofibrillary tangles. Zebrafish transgenic models have been generated with different overexpression strategies of human Tau protein. These transgenic lines have made it possible to highlight Tau interacting factors or factors which may limit the neurotoxicity induced by mutations and hyperphosphorylation of the Tau protein in neurons. Several studies have tested neuroprotective pharmacological approaches. On few-days-old larvae, modulation of various signaling or degradation pathways reversed the deleterious effects of Tau mutations, mainly hTauP301L and hTauA152T. Live imaging and live tracking techniques as well as behavioral follow-up enable the analysis of the wide range of Tau-related phenotypes from synaptic loss to cognitive functional consequences.

scholarly journals Performance Analysis of MPC Controller Applied for Hybrid PV-Wind Under Varying Weather Conditions

2020 ◽  
Vol 12 (4) ◽  
pp. 979-1000
Author(s):  
Houda LAABIDI ◽  
◽  
Houda JOUINI ◽  
Abdelkader MAMI ◽  
◽  
...  
Keyword(s):  
Weather Conditions ◽  
Total Power ◽  
Reference Tracking ◽  
Fast Transient Response ◽  
Electrical Grid ◽  
Voltage Vector ◽  
Three Phase ◽  
Predictive Controller ◽  
The Mathematical Model ◽  
Three Phase Inverter

The studied system contains a photovoltaic conversion chain with a total power of 7.2 kW, a wind conversion chain (5.1 kW), two-level inverter related to the electrical grid through an RL filter. The control systems of the simulation model include the Model Predictive Controller (MPC), which is mainly applied for both DC/DC converters and three-phase inverter. The MPC strategy uses the mathematical model of the considered power converters in order to predict the possible future behaviors of the different controlled variables. It permits selecting the optimal voltage vector, which is able to ensure a minimization of the specified cost function. Modeling and simulation are achieved using PSIM software in order to verify the system’s performances, highlighting many scenarios of varying meteorological conditions. The simulation responses prove that the proposed MPC algorithm can offer a fast transient response, an accurate reference tracking, a high-injected power quality with a low current THD (less than 1% in the steady state).

scholarly journals Penguatan Kampung Santri untuk Pengembangan Masyarakat Sadar Hukum di Wilayah Mangkang Kota Semarang

2018 ◽  
Vol 17 (2) ◽  
pp. 253
Author(s):  
Rihlatul Khoiriyah ◽  
Ali Imron ◽  
Ahmad Munif ◽  
Lathifah Munawaroh
Keyword(s):  
Family Law ◽  
Civil Law ◽  
Common Point ◽  
The State ◽  
Cultural Approach ◽  
Positive Law ◽  
The People ◽  
The Common ◽  
The Village

<p>This paper intends to see the extent of legal awareness of the community in the village area of the santri against family law derived from national legal products. The results of the study show two main points, first, the understanding of Islamic civil law (marriage and inheritance) of Mangkang region society is dominated to the accepted understanding of classical fiqh. The people of Mangkang region are not anti-starch against the civil law of Islam issued by the state in the form of positive law. Although the Mangkang area people see that both are ijtihadiyah products, but the existence of Indonesian civil law that has an administrative effect on others makes them accept a good denan. Second, a persuasive approach in the form of a cultural approach is more readily accepted by citizens. Mangkang area people feel comfortable when invited to dialogue and discussion related to Islamic civil law of Indonesia. In the end, by reaching the common point and the good that might be obtained, Indonesian civil law can be understood and well accepted.</p><p> </p><p>Tulisan ini bermaksud melihat sejauh mana kesadaran hukum masyarakat di wilayah kampung santri terhadap hukum keluarga yang bersumber dari produk hukum nasional. Hasil dari kajian menunjukkan dua hal pokok, pertama, pemahaman hukum perdata Islam (penikahan dan kewarisan)  masyarakat wilayah Mangkang didominasi kepada pemahaman yang diterima fiqh klasik. Masyarakat wilayah Mangkang tidak anti pati terhadap hukum perdata Islam yang dikeluarkan negara dalam bentuk hukum positif. Meskipun masyarakat wilayah Mangkang melihat bahwa keduanya merupakan produk ijtihadiyah, namun keberadaan hukum perdata Islam Indonesia yang memiliki dampak administratif kepada yang lainnya menjadikan mereka bisa menerima denan baik. Kedua, pendekatan persuasif dalam bentuk pendekatan budaya lebih mudah diterima oleh warga masyarakat. Masyarakat wilayah Mangkang merasa nyaman ketika diajak berdialog dan berdiskusi terkait hukum perdata Islam Indonesia. Pada akhirnya, dengan mencapai titik temu dan kebaikan yang mungkin akan didapat, hukum perdata Islam Indonesia bisa dipahami dan diterima dengan baik..</p>

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