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Relevant bibliographies by topics / Overmodulation

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Academic literature on the topic 'Overmodulation'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 September 2023

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Journal articles on the topic "Overmodulation"

1

Zhou, Jin, Shanhu Li, Jianning Zhang, Tianrui Fang, and Xiuyun Zhang. "Research on Space Vector Overmodulation Technology of Two-Level PWM Converters." Energies 15, no. 19 (September 27, 2022): 7086. http://dx.doi.org/10.3390/en15197086.

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In this paper, the characteristics of the voltage transfer ratio (VTR) and low-order harmonics of the major modern space vector overmodulation strategies for two-level PWM converters are discussed under different VTRs, and the complexity of the modulation algorithm is subsequently elaborated. First, the principles of these overmodulation strategies are summarized. After that, the accuracy and linearization of the VTR are obtained using the Fourier transform analysis, and the relationship between the main low harmonic components and the VTR is obtained in the same way. All the analysis results are verified through experiments. In addition, the merits and demerits of these overmodulation strategies and applications are revealed by comparing the simplicity of their modulation algorithm, digitization, and other characteristics. Finally, this paper reveals the essence of space vector overmodulation strategies. The results facilitate the design, performance prediction, and development of high-performance overmodulation strategies, as well as the transplantation of space vector overmodulation strategies into different converter topologies.

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Thakre, Mohan P., Jayesh A. Gangurde, Rakesh Shriwastava, Deepak P. Kadam, Sunil Somnath Kadlag, and Haridarshan S. Sonawane. "Investigative uses of overmodulation techniques in modular multilevel cascaded converter." Bulletin of Electrical Engineering and Informatics 11, no. 6 (December 1, 2022): 3147–56. http://dx.doi.org/10.11591/eei.v11i6.3958.

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Sinusoidal pulse width modulation (SPWM) is a method to generate the switching gate pulse of the converter. Overmodulation is a method where the modulation index exceeds the unity value and the system goes into the nonlinear region. To maintain the system in a linear region when operating in the overmodulation region, some techniques are developed. These techniques helped to operate the system in the linear range. Medium and high-power energy conversion systems mostly use a modular multilevel cascaded converter (MMCC), which has been an issue improving significantly in recent years. In this article, MMCC-based overmodulation techniques are compared with conventional PWM and analyzed on DC bus utilization (DBU), and total harmonic distortion (THD). MATLAB/Simulink digital platform used demonstrate overmodulation technique.

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Xia, Yihui, Xiaofeng Zhang, Zhihao Ye, Zerun Wang, and Liming Huang. "Research on an Optimized Overmodulation Strategy Based on Rectifier of Indirect Space Vector of Matrix Converter." Electronics 11, no. 13 (June 27, 2022): 2009. http://dx.doi.org/10.3390/electronics11132009.

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Output performances including voltage error and THD effected by hexagon vector and basic vector with traditional indirect space vector overmodulation method are analyzed, and an improved overmodulation method based on input current vector synthesized is presented. Simulation and experimental results are carried out to validate the effectiveness of the proposed method. Simulation results indicate that the proposed input current vector-synthesized overmodulation strategy has better output performances. The experimental results verify that theoretical analysis is right and the proposed method is feasible.

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Park, Ji-Hwan, Hee-Sun Lim, Geun-Ho Lee, and Heon-Hyeong Lee. "A Study on the Optimal Control of Voltage Utilization for Improving the Efficiency of PMSM." Electronics 11, no. 13 (July 4, 2022): 2095. http://dx.doi.org/10.3390/electronics11132095.

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When performing weak flux control to drive a permanent-magnet synchronous motor at high speed, the efficiency is lowered because the copper loss increases as the negative D-axis current increases. In addition, if the overmodulation index is slightly lowered and driven without setting it to the maximum value, the phase current ripple reduction effect can be expected compared to the six-step control. Therefore, if the motor is operated at a current point that can minimize the sum of copper loss and iron loss, the motor can be driven with maximum efficiency. In addition, if the overmodulation index is slightly lower than that of the six-step control, the phase current ripple can be reduced. This paper proposes a method for finding an overmodulation index to maximize driving efficiency when driving a motor based on the magnetic flux–torque command. In addition, an algorithm for driving a motor with maximum efficiency by applying an optimal overmodulation index table is proposed. Based on the MATLAB Simulink simulation, the efficiency change characteristics according to the overmodulation index change are reviewed, and the efficiency improvement and current ripple reduction effects are verified through a dynamometer experiment.

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Jidin, Auzani, New Lai Sim, and Tole Sutikno. "Improvement of Torque Capability of Direct Torque Control of Induction Machines." International Journal of Power Electronics and Drive Systems (IJPEDS) 8, no. 3 (September 1, 2017): 1070. http://dx.doi.org/10.11591/ijpeds.v8.i3.pp1070-1079.

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A control strategy for overmodulation operation of direct torque control hysteresis based in induction machine is proposed. The strategy is to extend the constant torque region as well as to improve the torque capability. The proposed overmodulation strategy is different to SVM based system where the reference stator voltage is available. In order for DTC hysteresis based system to be able to achieve that, several modifications have been applied so that the proposed overmodulation can be achieved by gradually transforming the PWM voltage waveform to six-step mode. Simulated results were provided to demonstrate the effectiveness of the strategy.

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Ma, Zhixun, Haichuan Niu, Xiang Wu, Xu Zhang, and Guobin Lin. "An Improved Overmodulation Strategy for a Three-Level NPC Inverter Considering Neutral-Point Voltage Balance and Common-Mode Voltage Suppression." Sustainability 14, no. 19 (October 2, 2022): 12558. http://dx.doi.org/10.3390/su141912558.

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The three-level neutral-point clamped voltage source inverter (3L-NPC-VSI) is widely used in the maglev traction systems due to its high output voltage, large output capacity and low output current harmonics. In order to improve the utilization of the DC-bus voltage, an overmodulation strategy is necessary. This paper proposes an improved overmodulation strategy based on the minimum amplitude error method for a 3L-NPC-VSI. Compared with the conventional overmodulation strategy based on the minimum amplitude error method, the utilization of the DC-bus voltage is higher. Meanwhile, a virtual space vector modulation strategy is adopted for inverter neutral-point (NP) voltage balance and common-mode voltage (CMV) suppression. Furthermore, the suppression of leakage current also has been verified. Furthermore, the implementation details of the proposed overmodulation strategy based on minimum amplitude error method is elaborated. The effectiveness of the proposed method is verified by simulation and experimental results.

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Zhao, Li, Shoudao Huang, Jian Zheng, and Yuan Gao. "A Harmonic Suppression SVPWM Strategy for the Asymmetric Six-Phase Motor Fed by Two-Level Six-Phase VSI Operating in the Overmodulation Region." Energies 15, no. 20 (October 14, 2022): 7589. http://dx.doi.org/10.3390/en15207589.

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For the asymmetric six-phase motor fed by a two-level six-phase voltage source inverter (VSI), when the modulation index is less than 0.5774, the motor operates in the linear region, and the harmonics in the Z1 − Z2 subspace can be suppressed to zero. When the modulation index is beyond 0.5774 and less than 0.6221, the motor operates in overmodulation regions, and the harmonics in the Z1 − Z2 subspace cannot be suppressed to zero. To minimize the harmonics in the Z1 − Z2 subspace for these regions, a harmonic suppression strategy, namely, harmonic suppression overmodulation strategy (HSOS), is proposed in this paper. The lower-order harmonics of the Z1 − Z2 subspace, namely, the 5th, 7th, 17th and 19th, are considered. Compared with the traditional four-vector overmodulation strategy (TFOS), the content of the 5th harmonic is reduced by about 20%, and the total harmonic distortion (THDZ1Z2) of these four kinds of harmonics is reduced by about 21% in the proposed HSOS. Finally, the simulation and experiment are carried out to verify the effectiveness of the proposed strategy.

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Lee, Heekwang, Seungmin Hong, Jongwon Choi, Kwanghee Nam, and Jaehong Kim. "Sector-Based Analytic Overmodulation Method." IEEE Transactions on Industrial Electronics 66, no. 10 (October 2019): 7624–32. http://dx.doi.org/10.1109/tie.2018.2883270.

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Garcia, Raymundo Cordero, and João Onofre Pereira Pinto. "A new simplified SVPWM algorithm based on modified carrier signal." Sba: Controle & Automação Sociedade Brasileira de Automatica 22, no. 5 (October 2011): 545–57. http://dx.doi.org/10.1590/s0103-17592011000500009.

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This paper presents a simplified algorithm of space vector pulse width modulation (SVPWM) for a two-level three-phase inverter, which can operate in undermodulation and overmodulation modes. In other simplifications founded in literature, the reference voltages are modified and compared with a triangular carrier to estimate the switching states of the inverter. However, this paper proposes the modification of the carrier signal instead of the references. This procedure reduces the number of mathematical operations and increases the execution speed of SVPWM algorithm in DSPs or FPGAs. The reference voltages are sinusoidal, even for overmodulation mode. Simulation and experimental results proves that the proposed simplification produces the same switching patterns than conventional SVPWM, is simpler and is faster than other simplifications.

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Oleschuk, V. "Analysis and Simulation of Overmodulation Modes of a Three-Inverter Block of the Photovoltaic Installation." Problems of the Regional Energetics, no. 3(55) (August 2022): 17–26. http://dx.doi.org/10.52254/1857-0070.2022.3-55.02.

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The purpose of this work is to modernize the control scheme of a transformer-based photovoltaic system with three inverters controlled by the modified algorithms of synchronous spacevector PWM in order to ensure linear regulation of the system in the overmodulation zone of the inverter block in the process of forming a symmetrical and synchronized (with the operating frequency of the system) voltage on the inverter-side windings of a power transformer. This goal is achieved by the fact that the process of two-stage control of the system in the zone of overmodulation of inverters is carried out on the basis of synchronized phase shifts between the control signals of inverters (a constant phase shift, as well as an additional adjustable phase shift between the inverter signals as a function of the duration of clock subintervals), with an appropriate modification of the algorithms of synchronous PWM of inverters due to the inclusion of two specialized correction factors in the basic functional dependencies. The most significant results of the work include the fact that in a system with a modified control scheme and modulation of the inverter block in the overmodulation zone, the resulting voltage on the inverter-side windings of the power transformer is characterized by quarterwave symmetry, and its spectrum contains no even-order harmonics, as well as subharmonics, including regimes of fluctuations in the operating frequency of the system connected to a three-phase network, thereby helping to reduce losses in the transformer windings and improve the efficiency of photovoltaic systems.

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Dissertations / Theses on the topic "Overmodulation"

1

Lerdudomsak, Smith, Shinji Doki, and Shigeru Okuma. "Torque control scheme for PMSM in overmodulation range." IEEE, 2009. http://hdl.handle.net/2237/13964.

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Venugopal, S. "Study On Overmodulation Methods For PWM Inverter Fed AC Drives." Thesis, Indian Institute of Science, 2006. https://etd.iisc.ac.in/handle/2005/278.

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A voltage source inverter is commonly used to supply a variable frequency variable voltage to a three phase induction motor in a variable speed application. A suitable pulse width modulation (PWM) technique is employed to obtain the required output voltage in the line side of the inverter. Real-time methods for PWM generation can be broadly classified into triangle comparison based PWM (TCPWM) and space vector based PWM (SVPWM). In TCPWM methods such as sine-triangle PWM, three phase reference modulating signals are compared against a common triangular carrier to generate the PWM signals for the three phases. In SVPWM methods, a revolving reference voltage vector is provided as voltage reference instead of three phase modulating waves. The magnitude and frequency of the fundamental component in the line side are controlled by the magnitude and frequency, respectively, of the reference vector. The fundamental line side voltage is proportional to the reference magnitude during linear modulation. With sine-triangle PWM, the highest possible peak phase fundamental voltage is 0.5Vdc, where Vdc is the DC bus voltage, in the linear modulation zone. With techniques such as third harmonic injection PWM and space vector based PWM, the peak phase fundamental voltage can be as high as (formula) (i.e., 0:577Vdc)during linear modulation. To increase the line side voltage further, the operation of the VSI must be extended into the overmodulation region. The overmodulation region extends upto the six-step mode, which gives the highest possible ac voltage for a given (formula). In TCPWM based methods, increasing the reference magnitude beyond a certain level leads to pulse dropping, and gradually leads to six-step operation. However, in SVPWM methods, an overmodulation algorithm is required for controlling the line-side voltage during overmodulation and to achieve a smooth transition from PWM to six-step mode. Numerous overmodulation algorithms have been proposed in the literature for space vector modulated inverter. A well known algorithm among these divides the overmodulation zone into two zones, namely zone-I and zone-II. This is termed as the 'existing overmodulation algorithm' here. This algorithm is modified in the present work to reduce computational burden without much increase in the line current distortion. During overmodulation, the fundamental line side voltage and the reference magnitude are not proportional, which is undesirable from the control point of view. The present work ensures a linear relationship between the two. Apart from the fundamental component, the inverter output voltage mainly consists of harmonic components at high frequencies (around switching frequency and the integral multiples) during linear modulation. However, during overmodulation, low order harmonic components such as 5th, 7th, 11th, 13th etc., are also present in the output voltage. These low order harmonic voltages lead to low order harmonic currents in the motor. The sum of the lower order harmonic currents is termed as 'lower order current ripple'. The present thesis proposes a method for estimation of lower order current ripple in real-time. In closed loop current control, the motor current is fed back to the current controller. During overmodulation, the motor current contains low order harmonics, which appear in the current error fed to the controller. These harmonic currents are amplified by the current error amplifier deteriorating the performance of the drive. It is possible to filter the lower order harmonic currents before being fed back. However, filtering introduces delay in the current loop, and reduces the bandwidth even during linear modulation. In the present work, the estimated lower order current ripple is subtracted from the measured current before the latter is fed back to the controller. The estimation of lower order current ripple and the proposed current control are verified through simulation using MATLAB/SIMULINK and also experimentally on a laboratory prototype. The experimental setup comprises of a field programmable gate arrays (FPGA) based digital controller, an IGBT based inverter and a four-pole squirrel cage induction motor. (Pl refer the original document for formula)

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Venugopal, S. "Study On Overmodulation Methods For PWM Inverter Fed AC Drives." Thesis, Indian Institute of Science, 2006. http://hdl.handle.net/2005/278.

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A voltage source inverter is commonly used to supply a variable frequency variable voltage to a three phase induction motor in a variable speed application. A suitable pulse width modulation (PWM) technique is employed to obtain the required output voltage in the line side of the inverter. Real-time methods for PWM generation can be broadly classified into triangle comparison based PWM (TCPWM) and space vector based PWM (SVPWM). In TCPWM methods such as sine-triangle PWM, three phase reference modulating signals are compared against a common triangular carrier to generate the PWM signals for the three phases. In SVPWM methods, a revolving reference voltage vector is provided as voltage reference instead of three phase modulating waves. The magnitude and frequency of the fundamental component in the line side are controlled by the magnitude and frequency, respectively, of the reference vector. The fundamental line side voltage is proportional to the reference magnitude during linear modulation. With sine-triangle PWM, the highest possible peak phase fundamental voltage is 0.5Vdc, where Vdc is the DC bus voltage, in the linear modulation zone. With techniques such as third harmonic injection PWM and space vector based PWM, the peak phase fundamental voltage can be as high as (formula) (i.e., 0:577Vdc)during linear modulation. To increase the line side voltage further, the operation of the VSI must be extended into the overmodulation region. The overmodulation region extends upto the six-step mode, which gives the highest possible ac voltage for a given (formula). In TCPWM based methods, increasing the reference magnitude beyond a certain level leads to pulse dropping, and gradually leads to six-step operation. However, in SVPWM methods, an overmodulation algorithm is required for controlling the line-side voltage during overmodulation and to achieve a smooth transition from PWM to six-step mode. Numerous overmodulation algorithms have been proposed in the literature for space vector modulated inverter. A well known algorithm among these divides the overmodulation zone into two zones, namely zone-I and zone-II. This is termed as the 'existing overmodulation algorithm' here. This algorithm is modified in the present work to reduce computational burden without much increase in the line current distortion. During overmodulation, the fundamental line side voltage and the reference magnitude are not proportional, which is undesirable from the control point of view. The present work ensures a linear relationship between the two. Apart from the fundamental component, the inverter output voltage mainly consists of harmonic components at high frequencies (around switching frequency and the integral multiples) during linear modulation. However, during overmodulation, low order harmonic components such as 5th, 7th, 11th, 13th etc., are also present in the output voltage. These low order harmonic voltages lead to low order harmonic currents in the motor. The sum of the lower order harmonic currents is termed as 'lower order current ripple'. The present thesis proposes a method for estimation of lower order current ripple in real-time. In closed loop current control, the motor current is fed back to the current controller. During overmodulation, the motor current contains low order harmonics, which appear in the current error fed to the controller. These harmonic currents are amplified by the current error amplifier deteriorating the performance of the drive. It is possible to filter the lower order harmonic currents before being fed back. However, filtering introduces delay in the current loop, and reduces the bandwidth even during linear modulation. In the present work, the estimated lower order current ripple is subtracted from the measured current before the latter is fed back to the controller. The estimation of lower order current ripple and the proposed current control are verified through simulation using MATLAB/SIMULINK and also experimentally on a laboratory prototype. The experimental setup comprises of a field programmable gate arrays (FPGA) based digital controller, an IGBT based inverter and a four-pole squirrel cage induction motor. (Pl refer the original document for formula)

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Smith, Lerdudomsak, Shinji Doki, and Shigeru Okuma. "Analysis for Unstable Problem of PMSM Current Control System in Overmodulation Range." IEEE, 2008. http://hdl.handle.net/2237/12080.

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Lerdudomsak, Smith, Shinji Doki, and Shigeru Okuma. "Voltage limiter calculation method for fast torque response of IPMSM in overmodulation range." IEEE, 2009. http://hdl.handle.net/2237/13962.

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Smith, Lerdudomsak, Mitsuhiro Kadota, Shinji Doki, and Shigeru Okuma. "Harmonic Currents Estimation and Compensation Method for Current Control System of IPMSM in Overmodulation Range." IEEE, 2007. http://hdl.handle.net/2237/9474.

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Carnielutti, Fernanda de Morais. "Modulação space vector para conversores multiníveis com células assimétricas em cascata sob condições de faltas." Universidade Federal de Santa Maria, 2015. http://repositorio.ufsm.br/handle/1/3694.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
This Thesis proposes a Space Vector Modulation for cascaded miltilevel converters with asymmetric cells under normal conditions and with faults in the power cells, avoiding converter saturation as much as possible. The switching state vectors and the voltage references are represented in the output line-to-line voltages coordinate system. Under this representation, the switching state vectors have only integer entries, easing the implementation of the proposed algorithm. The modulation is developed in a way such as to guarantee that the higher voltage cells switch at low frequency by the choice of only one vector per switching period, minimizing the switching losses. For the lower voltage cells (1pu), that switch with PWM, three algorithms were developed for defining the switching sequences: (i) offline, (ii) online and (iii) hybrid, where a carrier-based geometrical modulation and the SV are mixed in a simple and unified approach. The algorithm is described in a generic way, for converters with any number of levels, and then, simulation and experimental results are shown for, respectively, cascaded miltilevel converters with asymmetric cells with DC bus voltages ratio of 1:2:4pu and 1:2pu. The algorithm does not use conventional separation lines to find where the multiple references for the power cells are located inside the SV diagram. It also avoids converter saturation and, when it is unavoidable, detects its occurrence and changes the operation mode to overmodulation. This one is treated as a modification of the orignal algorithm, allowing the converter to operate with a wider range of modulation indexes and fault conditions. It is shown that two overmodulation modes can occur: in the first, there is still an area inside the SV diagram where overmodulation is avoided, and, in the second, the converter overmodulates during almost all the time. Modulation strategies are proposed for both cases, including the insertion of a bandpass filter in the second case, so as to minimize the distortions and unbalances that arise on the converter output line-to-line voltages during this operation mode. For the overmodulation, simulation and experimental results are also shown for cascaded miltilevel converters with asymmetric cells with DC bus voltages ratio of 1:2:4pu and 1:2pu. Finally, the final conclusions are drawn and future works are proposed.
Esta Tese propõe uma estratégia de modulação Space Vector (SV) para conversores multiníveis com células assimétricas em cascata durante operação normal e com faltas nas células de potência, garantindo a não ocorrência de saturação do conversor sempre que esta não for desejada, especialmente durante faltas. Os vetores de comutação e as referências de tensão são representados no sistema de coordenadas das tensões de linha de saída. Desta forma, os vetores de comutação apresentam apenas coordenadas inteiras, facilitando a implementação do algoritmo proposto. A modulação é desenvolvida de forma a garantir que as células de maior tensão comutem em baixa frequência, pela escolha de apenas um vetor por período de comutação, minimizando as perdas de comutação do conversor. Para as células de menor tensão (1pu), que comutam com PWM, foram desenvolvidos três algoritmos para definição das sequências de comutação: definição (i) offline, (ii) online e (iii) híbrida, onde as modulações geométrica com portadora e SV são mescladas em uma abordagem única e simplificada. O algoritmo SV é descrito de maneira genérica, para conversores com qualquer número de níveis, e, na sequência, são apresentados resultados de simulação e experimentais para, respectivamente, conversores multiníveis com células assimétricas em cascata com razão das tensões dos barramentos CC de 1:2:4pu e 1:2pu. Este algoritmo não faz uso de retas de separação convencionais para encontrar os domínios onde as múltiplas referências para as células de potência se encontram dentro do diagrama SV. Também evita ao máximo a saturação do conversor, e, quando esta é inevitável, detecta sua ocorrência e muda o modo de operação para sobremodulação. Esta é tratada por meio de modificações no algoritmo original, permitindo a operação do conversor com um maior número de índices de modulação e condições de falta. É mostrado que existem dois casos de sobremodulação durante faltas nas células de potência: no primeiro, ainda há uma área no interior do diagrama SV onde a sobremodulação é evitada, e, no segundo, o conversor sobremodula durante praticamente todo o tempo. São propostas estratégias de modulação para ambos os casos, incluindo a inserção de um filtro passa-faixa no segundo, para minimizar as distorções e os desequilíbrios que surgem nas tensões de linha de saída do conversor, quando este se encontra neste modo de operação. Para a sobremodulação, também são apresentados resultados de simulação e experimentais para os conversores multiníveis com células assimétricas em cascata com razão das tensões dos barramentos CC de 1:2:4pu e 1:2pu. Por fim, as conclusões finais são apresentadas e são propostos trabalhos futuros.

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Narayanan, G. "Synchronised Pulsewidth Modulation Strategies Based On Space Vector Approach For Induction Motor Drives." Thesis, Indian Institute of Science, 1999. https://etd.iisc.ac.in/handle/2005/139.

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In high power induction motor drives, the switching frequency of the inverter is quite low due to the high losses in the power devices. Real-time PWM strategies, which result in reduced harmonic distortion under low switching frequencies and have maximum possible DC bus utilisation, are developed for such drives in the present work. The space vector approach is taken up for the generation of synchronised PWM waveforms with 3-Phase Symmetry, Half Wave Symmetry and Quarter Wave Symmetry, required for high-power drives. Rules for synchronisation and the waveform symmetries are brought out. These rules are applied to the conventional and modified forms of space vector modulation, leading to the synchronised conventional space vector strategy and the Basic Bus Clamping Strategy-I, respectively. Further, four new synchronised, bus-clamping PWM strategies, namely Asymmetric Zero-Changing Strategy, Boundary Sampling Strategy-I, Basic Bus Clamping Strategy-II and Boundary Sampling Strategy-II, are proposed. These strategies exploit the flexibilities offered by the space vector approach like double-switching of a phase within a subcycle, clamping of two phases within a subcycle etc. It is shown that the PWM waveforms generated by these strategies cannot be generated by comparing suitable 3-phase modulating waves with a triangular carrier wave. A modified two-zone approach to overmodulation is proposed. This is applied to the six synchronised PWM strategies, dealt with in the present work, to extend the operation of these strategies upto the six-step mode. Linearity is ensured between the magnitude of the reference and the fundamental voltage generated in the whole range of modulation upto the six-step mode. This is verified experimentally. A suitable combination of these strategies leads to a significant reduction in the harmonic distortion of the drive at medium and high speed ranges over the conventional space vector strategy. This reduction in harmonic distortion is demonstrated, theoretically as well as experimentally, on a constant V/F drive of base frequency 50Hz for three values of maximum switching frequency of the inverter, namely 450Hz, 350Hz and 250Hz. Based on the notion of stator flux ripple, analytical closed-form expressions are derived for the harmonic distortion due to the different PWM strategies. The values of harmonic distortion, computed based on these analytical expressions, compare well with those calculated based on Fourier analysis and those measured experimentally.

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Narayanan, G. "Synchronised Pulsewidth Modulation Strategies Based On Space Vector Approach For Induction Motor Drives." Thesis, Indian Institute of Science, 1999. http://hdl.handle.net/2005/139.

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In high power induction motor drives, the switching frequency of the inverter is quite low due to the high losses in the power devices. Real-time PWM strategies, which result in reduced harmonic distortion under low switching frequencies and have maximum possible DC bus utilisation, are developed for such drives in the present work. The space vector approach is taken up for the generation of synchronised PWM waveforms with 3-Phase Symmetry, Half Wave Symmetry and Quarter Wave Symmetry, required for high-power drives. Rules for synchronisation and the waveform symmetries are brought out. These rules are applied to the conventional and modified forms of space vector modulation, leading to the synchronised conventional space vector strategy and the Basic Bus Clamping Strategy-I, respectively. Further, four new synchronised, bus-clamping PWM strategies, namely Asymmetric Zero-Changing Strategy, Boundary Sampling Strategy-I, Basic Bus Clamping Strategy-II and Boundary Sampling Strategy-II, are proposed. These strategies exploit the flexibilities offered by the space vector approach like double-switching of a phase within a subcycle, clamping of two phases within a subcycle etc. It is shown that the PWM waveforms generated by these strategies cannot be generated by comparing suitable 3-phase modulating waves with a triangular carrier wave. A modified two-zone approach to overmodulation is proposed. This is applied to the six synchronised PWM strategies, dealt with in the present work, to extend the operation of these strategies upto the six-step mode. Linearity is ensured between the magnitude of the reference and the fundamental voltage generated in the whole range of modulation upto the six-step mode. This is verified experimentally. A suitable combination of these strategies leads to a significant reduction in the harmonic distortion of the drive at medium and high speed ranges over the conventional space vector strategy. This reduction in harmonic distortion is demonstrated, theoretically as well as experimentally, on a constant V/F drive of base frequency 50Hz for three values of maximum switching frequency of the inverter, namely 450Hz, 350Hz and 250Hz. Based on the notion of stator flux ripple, analytical closed-form expressions are derived for the harmonic distortion due to the different PWM strategies. The values of harmonic distortion, computed based on these analytical expressions, compare well with those calculated based on Fourier analysis and those measured experimentally.

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10

Hava, Ahmet M. "Carrier based PWM-VSI drives in the overmodulation region." 1998. http://catalog.hathitrust.org/api/volumes/oclc/42750687.html.

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Thesis (Ph. D.)--University of Wisconsin--Madison, 1998.
Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 330-360).

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Book chapters on the topic "Overmodulation"

1

Weik, Martin H. "overmodulation." In Computer Science and Communications Dictionary, 1209. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_13414.

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Wang, Gaolin, Nannan Zhao, Guoqiang Zhang, and Dianguo Xu. "Optimized Overmodulation Strategy." In Reduced DC-link Capacitance AC Motor Drives, 189–211. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-8566-1_8.

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Patin, Nicolas, and Eric Monmasson. "Overmodulation of Three-phase Voltage Inverters." In Power Electronic Converters, 71–92. Hoboken, NJ USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118621196.ch3.

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Yue, Wei. "Application of Three-Level Voltage Inverter Based on Space Vector Modulation Overmodulation Algorithm." In Lecture Notes in Electrical Engineering, 875–82. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0115-6_98.

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"overmodulation, n." In Oxford English Dictionary. 3rd ed. Oxford University Press, 2023. http://dx.doi.org/10.1093/oed/6592240023.

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"Overmodulation of an Inverter." In Pulse Width Modulation for Power Converters. IEEE, 2009. http://dx.doi.org/10.1109/9780470546284.ch8.

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"Appendix 4: Overmodulation of a SinglePhase Leg." In Pulse Width Modulation for Power Converters. IEEE, 2009. http://dx.doi.org/10.1109/9780470546284.app4.

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Conference papers on the topic "Overmodulation"

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Murali, Sriram, and Pankaj Gupta. "Overmodulation protection in FM transmitters." In 2013 National Conference on Communications (NCC). IEEE, 2013. http://dx.doi.org/10.1109/ncc.2013.6488001.

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Halasz, S. "Overmodulation region of multi-phase inverters." In 2008 13th International Power Electronics and Motion Control Conference (EPE/PEMC 2008). IEEE, 2008. http://dx.doi.org/10.1109/epepemc.2008.4635343.

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Neacsu, Dorin, Kaushik Rajashekara, and Fani Gunawan. "Overmodulation Algorithm for Zero-Switching Modulation." In 2006 IEEE International Symposium on Industrial Electronics. IEEE, 2006. http://dx.doi.org/10.1109/isie.2006.295660.

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Yu, Qing, Kevin J. Parker, Kevin E. Spaulding, and Rodney L. Miller. "Improved digital multitoning with overmodulation scheme." In Photonics West '98 Electronic Imaging, edited by Giordano B. Beretta and Reiner Eschbach. SPIE, 1998. http://dx.doi.org/10.1117/12.298299.

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Bon-Ho Bae, Sang-Hoon Kim, and Seung-Ki Sul. "A new overmodulation strategy for traction drive." In APEC '99. Fourteenth Annual Applied Power Electronics Conference and Exposition. 1999 Conference Proceedings (Cat. No.99CH36285). IEEE, 1999. http://dx.doi.org/10.1109/apec.1999.749719.

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Young, Paul, and Matthias Preindl. "Optimal generalized overmodulation for multiphase PMSM drives." In 2017 IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 2017. http://dx.doi.org/10.1109/apec.2017.7930740.

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Bernardes, Thiago A., Humberto Pinheiro, and Vinicius F. Montagner. "PMSG current control in the overmodulation region." In IECON 2009 - 35th Annual Conference of IEEE Industrial Electronics (IECON). IEEE, 2009. http://dx.doi.org/10.1109/iecon.2009.5414825.

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Park, Jin-Sik, Shin-Myoung Jung, Hag-Wone Kim, and Myoung-Joong Youn. "Current control of PMSM in overmodulation region." In 2007 7th Internatonal Conference on Power Electronics (ICPE). IEEE, 2007. http://dx.doi.org/10.1109/icpe.2007.4692543.

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Kiatsookkanatorn, Paiboon, and Somboon Sangwongwanich. "Carrier-Based Overmodulation Strategy for Matrix Converters." In 2018 International Power Electronics Conference (IPEC-Niigata 2018-ECCE Asia). IEEE, 2018. http://dx.doi.org/10.23919/ipec.2018.8507502.

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Oleschuk, Valentin. "Algorithms of Overmodulation Regulation of Neutral Clamped Inverters for Photovoltaics." In 12th International Conference on Electronics, Communications and Computing. Technical University of Moldova, 2022. http://dx.doi.org/10.52326/ic-ecco.2022/el.04.

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Abstract:

This manuscript presents results of study and research of synchronous adjustment in the overmodulation control zone of three neutral-clamped inverters (NCIs) of the specific configuration of three-phase grid-connected photovoltaic system. It has been proved, that the corresponding modification of techniques and algorithms of pulsewidth modulation (PWM) for control of NCIs, assure symmetry and advanced harmonic composition of inverter-side winding voltage of multi-winding power transformer, thereby helping to reduce losses in windings of the transformer, and to improve the efficiency of photovoltaic installations.

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