The Experts below are selected from a list of 246 Experts worldwide ranked by ideXlab platform
Nikolay N. Lopatkin - One of the best experts on this subject based on the ideXlab platform.
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Computer Modeling of Three-Phase Multilevel Voltage Source Inverter with Nearest Vector Selecting Space Vector Control
2018 International Russian Automation Conference (RusAutoCon), 2018Co-Authors: Nikolay N. LopatkinAbstract:This paper is devoted to modeling of three-phase multilevel voltage source inverter (MLVSI) under the nearest vector selecting space vector control (SVC). Mathcad and LabVIEW controller models and some related results are described. “Instantaneous SVC” PSIM-model for simulation both control unit and power circuit (considering ideal power switches) of the seven-level cascaded MLVSI (CMLI) is presented and explored. Namely, the before obtained MLVSI output voltage waveform, its THD and integrated voltage harmonics factors (IHF) values as functions of the Amplitude Modulation Index are verified. The MLVSI input currents, drawn from the elementary cells power supplies, are also considered. Their waveforms and spectrograms examples are shown, the dependences of their average values and their values of integrated ripple factor on Amplitude Modulation Index are obtained.
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Aggregate Factors of Switchings and Integrated Voltage Harmonics of Three-Phase Multilevel Voltage Source Inverter with Nearest Vector Selecting Space Vector Control
2018 XIV International Scientific-Technical Conference on Actual Problems of Electronics Instrument Engineering (APEIE), 2018Co-Authors: Nikolay N. LopatkinAbstract:The paper deals with the model of the nearest vector selecting space vector control (SVC) of any arbitrary MLVSI circuit with any arbitrary number of any equal feeding DC voltage levels. Using the LabViewsimulation results for instantaneous SVC, the aggregate factors of switchings and integrated voltage harmonics (ASIHF) dependences on phase voltage Amplitude Modulation Index are obtained and compared with the corresponding results of the quarter-wave symmetric space vector PWM (SVPWM).
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Voltage source multilevel inverter voltage quality comparison under multicarrier sinusoidal PWM and space vector PWM of two delta voltages
2017 International Multi-Conference on Engineering Computer and Information Sciences (SIBIRCON), 2017Co-Authors: Nikolay N. LopatkinAbstract:The three-phase multilevel inverter output voltage waveforms are compared for the recently proposed simple voltage source multilevel inverter space vector PWM technique, which uses the natural nonsymmetric three-segment vectors switching sequence, and for the traditionally applied in industry multicarrier sinusoidal PWM, namely the phase opposition disposition (POD) PWM. The two variants of the POD sinusoidal PWM technique with the opposite carriers phases are considered. The developed waveforms mathematical models were implemented in LabVIEW virtual instruments for simulation. The values of the total harmonic distortion (THD), the first order integral voltage harmonics factor and the zero and first orders indices of the so-called aggregate switchings and integrated voltage harmonics factors are presented as the functions of the Amplitude Modulation Index for the five lowest values of the frequency Modulation Index. The simulation results have proved the clear superiority of the offered space vector PWM technique in the aggregate indices values.
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Voltage harmonics integral factors estimation of multilevel inverter with space vector Modulation of two delta voltages
2016 13th International Scientific-Technical Conference on Actual Problems of Electronics Instrument Engineering (APEIE), 2016Co-Authors: Nikolay N. LopatkinAbstract:The paper describes some details of the voltage source multilevel inverter space vector PWM algorithm developed on the base of one of the more general algorithms for oblique-angled coordinates of two delta voltages. The instantaneous output voltage waveform simulation has been carried out, and voltage THD and harmonics integral factors dependences on the Amplitude Modulation Index are presented.
N N Lopatkin - One of the best experts on this subject based on the ideXlab platform.
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Voltage THD and Integrated Voltage Harmonics Factors of Three-Phase Multilevel Voltage Source Inverter with Nearest Vector Selecting Space Vector Control
2018 International Conference on Industrial Engineering Applications and Manufacturing (ICIEAM), 2018Co-Authors: N N LopatkinAbstract:The paper deals with the nearest vector selecting space vector control (SVC) of any arbitrary MLVSI circuit with any arbitrary number of the equal feeding DC voltage levels. The Lab View model for the instantaneous SVC controller is designed. The MLVSI output voltage THD and integrated voltage harmonics factors (IHF) needed for computing of the load circuit voltages and currents and their quality indices are estimated as functions of the Amplitude Modulation Index and compared with the corresponding results of the quarter-wave symmetric space vector PWM (SVPWM).
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simple space vector pwm scheme with quarter wave symmetric output voltage waveform for three phase multilevel inverter
2017 International Multi-Conference on Engineering Computer and Information Sciences (SIBIRCON), 2017Co-Authors: N N LopatkinAbstract:The paper describes the simple technique for the quarter-wave symmetric output voltage waveform formation of the three-phase multilevel inverter. This technique is based on the applying the appropriate natural nonsymmetric three-segment vectors switching sequence to the recently proposed simple voltage source multilevel inverter space vector PWM algorithm. Some Mathcad simulated voltages waveforms and loci are shown, and the delta voltage total harmonic distortion (THD) and first three orders n-order integral voltage harmonics factors are presented as the functions of the Amplitude Modulation Index.
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Voltage quality comparison of space vector PWM voltage source multilevel inverter under symmetric and nonsymmetric switching sequence variants: Voltage waveforms, spectra and THD
2017 International Conference on Industrial Engineering Applications and Manufacturing (ICIEAM), 2017Co-Authors: N N LopatkinAbstract:The paper offers the simple voltage source multilevel inverter space vector PWM algorithm (based on the oblique-angled coordinates of two delta voltages) with the optimum three-segment non-symmetric vectors switching sequence variant providing the instantaneous output voltage quarter-wave symmetry. The comparisons with the five-segment variant by the voltage waveforms, spectra and THD are performed under the same lowest frequency Modulation Index values. The offered three-segment variant advantages in the THD values and in the switching quantity per the output voltage cycle are shown via the PSIM simulation. The Mathcad-drawn executed space vector loci are also shown and the voltage THD is presented as the function of the Amplitude Modulation Index.
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Voltage quality comparison of space vector PWM voltage source multilevel inverter under symmetric and nonsymmetric switching sequence variants: Voltage harmonics integral factors
2017 International Conference on Industrial Engineering Applications and Manufacturing (ICIEAM), 2017Co-Authors: N N Lopatkin, G. S. ZinovievAbstract:The comparisons of the new offered optimum three-segment and the previously considered five-segment variants of the space vectors switching sequence are continued in values of the first three orders of the n-order integral voltage harmonics factors and in values of the first three orders of some unified indices, the so-called n-order aggregate switchings and integrated voltage harmonics factors. The corresponding dependencies on the Amplitude Modulation Index are presented. The simulation results have proved the clear superiority of the new offered three-segment sequence in the main aggregate Index values. The offered voltage source multilevel inverter space vector PWM algorithm of two delta voltages with the optimum three-segment vectors switching sequence variant can find industrial application due to its simplicity.
Enrique Acha - One of the best experts on this subject based on the ideXlab platform.
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A New STATCOM Model for Power Flows Using the Newton–Raphson Method
IEEE Transactions on Power Systems, 2013Co-Authors: Enrique Acha, Behzad KazemtabriziAbstract:The paper presents a new model of the STATCOM aimed at power flow solutions using the Newton-Raphson method. The STATCOM is made up of the series connection of a voltage-source converter (VSC) and its connecting transformer. The VSC is represented in this paper by a complex tap-changing transformer whose primary and secondary windings correspond, notionally speaking, to the VSC's ac and dc buses, respectively. The magnitude and phase angle of the complex tap changer are said to be the Amplitude Modulation Index and the phase shift that would exist in a PWM inverter to enable either reactive power generation or absorption purely by electronic processing of the voltage and current waveforms within the VSC. The new STATCOM model allows for a comprehensive representation of its ac and dc circuits-this is in contrast to current practice where the STATCOM is represented by an equivalent variable voltage source, which is not amenable to a proper representation of the STATCOM's dc circuit. One key characteristic of the new VSC model is that no special provisions within a conventional ac power flow solution algorithm is required to represent the dc circuit, since the complex tap-changing transformer of the VSC gives rise to the customary ac circuit and a notional dc circuit. The latter includes the dc capacitor, which in steady-state draws no current, and a current-dependent conductance to represent switching losses. The ensuing STATCOM model possesses unparalleled control capabilities in the operational parameters of both the ac and dc sides of the converter. The prowess of the new STATCOM power flow model is demonstrated by numerical examples where the quadratic convergence characteristics of the Newton-Raphson method are preserved.
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A Novel STATCOM Model for Dynamic Power System Simulations
IEEE Transactions on Power Systems, 2013Co-Authors: Luis M. Castro, Enrique Acha, Claudio R. Fuerte-esquivelAbstract:This paper introduces an advanced model of the STATCOM suitable for steady-state and dynamic simulations of large-scale power systems. It allows for a comprehensive representation of the STATCOM's AC and DC circuits-this is in contrast to current practice where the STATCOM is represented using an equivalent variable voltage source which is not amenable to a proper representation of its DC circuit. The new STATCOM model comprises a voltage source converter (VSC) in series with an LTC transformer. The former is represented by a complex tap-changing transformer whose primary and secondary windings would correspond, in a notional sense, to the VSC's AC and DC buses, respectively. The magnitude and phase angle of the complex tap changer correspond to the Amplitude Modulation Index and the phase shift that would exist in a PWM inverter to enable either reactive power generation or absorption purely by electronic processing of the voltage and current waveforms within the VSC. The numerical technique employed to solve the STATCOM model is the Newton-Raphson method for both operating regimes, the steady-state and the dynamic-state. The latter involves discretization of the STATCOMs and synchronous generators differential equations so that the nonlinear algebraic equations and the discretized differential equations are linearized around a base operating point and assembled together in a unified frame-of-reference for robust iterative solutions.
Behzad Kazemtabrizi - One of the best experts on this subject based on the ideXlab platform.
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A New STATCOM Model for Power Flows Using the Newton–Raphson Method
IEEE Transactions on Power Systems, 2013Co-Authors: Enrique Acha, Behzad KazemtabriziAbstract:The paper presents a new model of the STATCOM aimed at power flow solutions using the Newton-Raphson method. The STATCOM is made up of the series connection of a voltage-source converter (VSC) and its connecting transformer. The VSC is represented in this paper by a complex tap-changing transformer whose primary and secondary windings correspond, notionally speaking, to the VSC's ac and dc buses, respectively. The magnitude and phase angle of the complex tap changer are said to be the Amplitude Modulation Index and the phase shift that would exist in a PWM inverter to enable either reactive power generation or absorption purely by electronic processing of the voltage and current waveforms within the VSC. The new STATCOM model allows for a comprehensive representation of its ac and dc circuits-this is in contrast to current practice where the STATCOM is represented by an equivalent variable voltage source, which is not amenable to a proper representation of the STATCOM's dc circuit. One key characteristic of the new VSC model is that no special provisions within a conventional ac power flow solution algorithm is required to represent the dc circuit, since the complex tap-changing transformer of the VSC gives rise to the customary ac circuit and a notional dc circuit. The latter includes the dc capacitor, which in steady-state draws no current, and a current-dependent conductance to represent switching losses. The ensuing STATCOM model possesses unparalleled control capabilities in the operational parameters of both the ac and dc sides of the converter. The prowess of the new STATCOM power flow model is demonstrated by numerical examples where the quadratic convergence characteristics of the Newton-Raphson method are preserved.
Claudio R. Fuerte-esquivel - One of the best experts on this subject based on the ideXlab platform.
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A Novel STATCOM Model for Dynamic Power System Simulations
IEEE Transactions on Power Systems, 2013Co-Authors: Luis M. Castro, Enrique Acha, Claudio R. Fuerte-esquivelAbstract:This paper introduces an advanced model of the STATCOM suitable for steady-state and dynamic simulations of large-scale power systems. It allows for a comprehensive representation of the STATCOM's AC and DC circuits-this is in contrast to current practice where the STATCOM is represented using an equivalent variable voltage source which is not amenable to a proper representation of its DC circuit. The new STATCOM model comprises a voltage source converter (VSC) in series with an LTC transformer. The former is represented by a complex tap-changing transformer whose primary and secondary windings would correspond, in a notional sense, to the VSC's AC and DC buses, respectively. The magnitude and phase angle of the complex tap changer correspond to the Amplitude Modulation Index and the phase shift that would exist in a PWM inverter to enable either reactive power generation or absorption purely by electronic processing of the voltage and current waveforms within the VSC. The numerical technique employed to solve the STATCOM model is the Newton-Raphson method for both operating regimes, the steady-state and the dynamic-state. The latter involves discretization of the STATCOMs and synchronous generators differential equations so that the nonlinear algebraic equations and the discretized differential equations are linearized around a base operating point and assembled together in a unified frame-of-reference for robust iterative solutions.