EPE Association: EPE-PEMC 2000 - Topic 03a: Modulation Strategies

EPE-PEMC 2000 - Topic 03a: Modulation Strategies
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2000 - Conference > EPE-PEMC 2000 - Topic 03: Control of Converters > EPE-PEMC 2000 - Topic 03a: Modulation Strategies

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   A New PWM Method for Three-Level Voltage Source Inverters
By Severo Mendes M.A., Seixas P.F., Donoso-Garcia P.F., Lima A.M.N.* [View]
[Download]

Abstract: In this paper, a space vector PWM method for three-level inverters is presented. In the proposed technique, boundary restrictions can be easily incorporated to minimize the harmonic distortion output voltages and to balance the voltages of the dc-link capacitor bank. The solutions obtained are simple algebraic equations relating directly the pulse widths of the gate signals to the phase reference voltages. Computer simulation results are used to demonstrate the main features of the proposed technique.

   A Resonant Current Controller for Three Phase Voltage Source PWM Inverter
By Le Claire J.C., Siala S., Yhuel J.F. [View]
[Download]

Abstract: This paper describes a three phase current control technique which involves a recent Resonant Current Controller (RCC) used for single phase Current Regulated Voltage Supply Inverter (CRVSI). The RCC is an alternative to the Hysteresis Current Controller (HCC). It adds an efficiently control of the inverter's maximum switching frequency which slightly depends on the electrical load. Concerning the three phase systems, the simulated and experimental results also confirm that the currents are accurately tracked. Moreover, the THD is negligible, even if the inverter DC bus voltage value is critical (over-modulation). Thus, the RCC is well suited to three phase current control.

   Algebraic Control Correlations for PWM High-Performance Inverted Drives
By Oleschuk V., Bose Bimal K.* [View]
[Download]

Abstract: The paper describes novel frequency-oriented methodology of direct pulsewidth modulation (PWM) of line-to-line output voltage of three-phase voltage source inverters for adjustable speed ac drives. The scheme uses special piece-wise approximation of the function of durations of active switching states from their position inside clock intervals. The operating principle is based on two-stage quasi-sliding strategy of modulation which permits: a) pure algebraic representation of laws of voltage modulation for high-performance systems; b) continuous synchronous and symmetrical variation of voltage waveform of inverter during the whole control range, and c) linear control in the zone of overmodulation. Computational simplicity and effectiveness characterize these DSP-oriented algorithms for digital modulation. Examples of determination of parameters of output voltage of the inverter are given. Also simulation results are presented for the drive system fed from inverter with the proposed method of PWM.

   Control of PWM Voltage Rectifier in Step Down Mode
By Ryba J. [View]
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Abstract: This paper presents simple control methods of PWM voltage rectifier in the state, when the output voltage is lower than the input voltage. It corrects opinion that voltage converter can work only with DC voltage higher than amplitude of line voltage. The principle is described on the one phase full bridge converter. The controls where power factor has maximum and control, where the output power has maximum are presented.

   FPGA Device Implementation of a PWM Modulation Algorithm for NPC IGBT Inverter with Optimized Device Effectiveness
By Scaglia A., Numeroli R., Vaccaro V. [View]
[Download]

Abstract: The paper describes a pulse width modulation method for the control of a three level NPC IGBT inverter and its implementation into a FPGA device. The purpose of the paper is to present and discuss the main problems arising when implementing on a FPGA device the complex switching strategy of an NPC Inverter, without disregarding that suitable device resources must be reserved to protection and monitoring functions. The authors will highlight the choices done in order to optimize the device effectiveness. The implementation criteria are very important for the inverter performance since they influence the possibility of utilizing complex algorithms. They will also describe a compensation method, suitable for the particular modulator implementation, in order to stabilize the potential of the neutral point. Finally, the paper summarizes the results of experimental tests of the aforesaid control method which were performed by an inverter rated 2 MVA at 2400 V.

   Optimised Space Vector Control Reducing Switching Losses in Current Source Inverters
By Bergauer J., Schindele L., Braun M. [View]
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Abstract: This paper describes a novel modification of space vector control which allows a minimization of switching losses in current source PWM inverters. The switching losses of conventional and optimized space vector control are calculated in a simulation and verified with an experimental test set-up.

   Programmed Pulse Width Modulation of Three-Phase Three-Level Diode Rectifiers
By Oguchi K., Yoshizawa T., Hoshi A., Kubota T. [View]
[Download]

Abstract: Pulse width modulation techniques for three-level diode rectifiers are discussed for minimum requirements for switching frequencies and input filter inductance. The simulated and experimental results show that the PWM method of eleventh and thirteenth harmonics elimination is well suited for compliance with IEC 1000-3-2, Class A from the view point of the smallest value of the filter inductance.

   Reformation of Conventional Peak Current-Mode
By Ninkoviæ P., Jankoviæ M. [View]
[Download]

Abstract: This paper presents two novel control methods to achieve fast and accurate average inductor current regulation in PWM DC/DC converters. The basic principles are described and the frequency analysis is performed. The theoretical predictions are verified through experimental and simulation results. It is shown that it is possible to retain all advantages of the peak current-mode and, at the same time, to overcome its drawbacks. One of the methods is very suitable for ac current regulation due to excellent dynamic features. The other is suitable for applications where overdamped response is highly recommended.

EPE-PEMC 2000 - Topic 03a: Modulation Strategies
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2000 - Conference > EPE-PEMC 2000 - Topic 03: Control of Converters > EPE-PEMC 2000 - Topic 03a: Modulation Strategies
	[return to parent folder]

	A New PWM Method for Three-Level Voltage Source Inverters By Severo Mendes M.A., Seixas P.F., Donoso-Garcia P.F., Lima A.M.N.*	[View] [Download]
Abstract: In this paper, a space vector PWM method for three-level inverters is presented. In the proposed technique, boundary restrictions can be easily incorporated to minimize the harmonic distortion output voltages and to balance the voltages of the dc-link capacitor bank. The solutions obtained are simple algebraic equations relating directly the pulse widths of the gate signals to the phase reference voltages. Computer simulation results are used to demonstrate the main features of the proposed technique.

	A Resonant Current Controller for Three Phase Voltage Source PWM Inverter By Le Claire J.C., Siala S., Yhuel J.F.	[View] [Download]
Abstract: This paper describes a three phase current control technique which involves a recent Resonant Current Controller (RCC) used for single phase Current Regulated Voltage Supply Inverter (CRVSI). The RCC is an alternative to the Hysteresis Current Controller (HCC). It adds an efficiently control of the inverter's maximum switching frequency which slightly depends on the electrical load. Concerning the three phase systems, the simulated and experimental results also confirm that the currents are accurately tracked. Moreover, the THD is negligible, even if the inverter DC bus voltage value is critical (over-modulation). Thus, the RCC is well suited to three phase current control.

	Algebraic Control Correlations for PWM High-Performance Inverted Drives By Oleschuk V., Bose Bimal K.*	[View] [Download]
Abstract: The paper describes novel frequency-oriented methodology of direct pulsewidth modulation (PWM) of line-to-line output voltage of three-phase voltage source inverters for adjustable speed ac drives. The scheme uses special piece-wise approximation of the function of durations of active switching states from their position inside clock intervals. The operating principle is based on two-stage quasi-sliding strategy of modulation which permits: a) pure algebraic representation of laws of voltage modulation for high-performance systems; b) continuous synchronous and symmetrical variation of voltage waveform of inverter during the whole control range, and c) linear control in the zone of overmodulation. Computational simplicity and effectiveness characterize these DSP-oriented algorithms for digital modulation. Examples of determination of parameters of output voltage of the inverter are given. Also simulation results are presented for the drive system fed from inverter with the proposed method of PWM.

	Control of PWM Voltage Rectifier in Step Down Mode By Ryba J.	[View] [Download]
Abstract: This paper presents simple control methods of PWM voltage rectifier in the state, when the output voltage is lower than the input voltage. It corrects opinion that voltage converter can work only with DC voltage higher than amplitude of line voltage. The principle is described on the one phase full bridge converter. The controls where power factor has maximum and control, where the output power has maximum are presented.

	FPGA Device Implementation of a PWM Modulation Algorithm for NPC IGBT Inverter with Optimized Device Effectiveness By Scaglia A., Numeroli R., Vaccaro V.	[View] [Download]
Abstract: The paper describes a pulse width modulation method for the control of a three level NPC IGBT inverter and its implementation into a FPGA device. The purpose of the paper is to present and discuss the main problems arising when implementing on a FPGA device the complex switching strategy of an NPC Inverter, without disregarding that suitable device resources must be reserved to protection and monitoring functions. The authors will highlight the choices done in order to optimize the device effectiveness. The implementation criteria are very important for the inverter performance since they influence the possibility of utilizing complex algorithms. They will also describe a compensation method, suitable for the particular modulator implementation, in order to stabilize the potential of the neutral point. Finally, the paper summarizes the results of experimental tests of the aforesaid control method which were performed by an inverter rated 2 MVA at 2400 V.

	Optimised Space Vector Control Reducing Switching Losses in Current Source Inverters By Bergauer J., Schindele L., Braun M.	[View] [Download]
Abstract: This paper describes a novel modification of space vector control which allows a minimization of switching losses in current source PWM inverters. The switching losses of conventional and optimized space vector control are calculated in a simulation and verified with an experimental test set-up.

	Programmed Pulse Width Modulation of Three-Phase Three-Level Diode Rectifiers By Oguchi K., Yoshizawa T., Hoshi A., Kubota T.	[View] [Download]
Abstract: Pulse width modulation techniques for three-level diode rectifiers are discussed for minimum requirements for switching frequencies and input filter inductance. The simulated and experimental results show that the PWM method of eleventh and thirteenth harmonics elimination is well suited for compliance with IEC 1000-3-2, Class A from the view point of the smallest value of the filter inductance.

	Reformation of Conventional Peak Current-Mode By Ninkoviæ P., Jankoviæ M.	[View] [Download]
Abstract: This paper presents two novel control methods to achieve fast and accurate average inductor current regulation in PWM DC/DC converters. The basic principles are described and the frequency analysis is performed. The theoretical predictions are verified through experimental and simulation results. It is shown that it is possible to retain all advantages of the peak current-mode and, at the same time, to overcome its drawbacks. One of the methods is very suitable for ac current regulation due to excellent dynamic features. The other is suitable for applications where overdamped response is highly recommended.