EPE Association: EPE 2013 - DS2e: Adjustable Speed Drives

EPE 2013 - DS2e: Adjustable Speed Drives
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2013 ECCE Europe - Conference > EPE 2013 - Topic 11: Adjustable speed drives > EPE 2013 - DS2e: Adjustable Speed Drives

   [return to parent folder]

   Analysis of Current Harmonics in Inverter-Driven Interior Permanent Magnet Synchronous Machines
By Tobias GEMASSMER, Michael BRAUN [View]
[Download]

Abstract: This paper presents the analysis of current harmonics in an inverter-driven interior permanent magnetmachine for different modulation methods. In contrast to other approaches, the influence of the saliency(Ld ≠ Lq) on the harmonics is being considered. By use of the rms-value of the currents, analyticallyclosed equations can be deduced and tedious Fourier analyses of single harmonics can be avoided.The derivation of the analytic equations is described and the results are verified by numerical simulationas well as by experimental results.

   Characteristics of Independent Control of Two Permanent Magnet Synchronous Motors Fed by a Four-Leg Inverter
By Takayuki MOROI, Haruki TANAKA, Yuji KUBO, Kouki MATSUSE [View]
[Download]

Abstract: The four-leg inverter (4LI) which drives two induction motors have been studied, but the drives oftwo permanent magnet synchronous motors (PMSMs) fed by a four-leg inverter have not been studied.PMSMs can drive not only speed control but also position control. This paper shows thecharacteristics of two PMSMs independent drives fed by a 4LI. First, this paper shows the method of4LI to drive motor. The method of 4LI is expanded two-arm modulation and compensation of neutralvoltage in two capacitors. Next, this paper shows the experimental results of speed and positioncontrol. Finally, this paper shows conclusions

   Common mode voltage and zero sequence current reduction in an open-end load fed by a two-output indirect matrix converter
By Javier RIEDEMANN, Ruben PENA, Roberto CARDENAS, Jon CLARE, Pat WHEELER, Marco RIVERA [View]
[Download]

Abstract: A Space Vector Modulation (SVM) strategy for an open-end load fed by an indirect matrix converterconsisting on one input stage and two output stages is presented. The modulation strategy aims toreduce the instantaneous common mode voltage and dynamically compensate the phase zero sequencecurrent.

   Detecting Incipient Stator Winding Conductor Faults in Inverter Fed Induction Machines
By Goran STOJCIC, Markus VOGELSBERGER, Thomas WOLBANK [View]
[Download]

Abstract: In variable speed drive applications the inverter fed induction machine is one of the most reliable systems. However, increasing demands on efficiency leads to higher wear of all system components. Unexpected machine breakdowns cause economic losses and/or undesired scenarios in safety-critical areas. Thus condition monitoring of all components can reduce the risk of outages due to faults. High electrical and magnetic forces together with increased environmental stresses in rough application fields lead to a higher probability of stator winding faults. Beside inter-turn short-circuit faults open-circuit winding faults are under the most frequent types of faults. Open-circuit winding faults usually start with a crack or conductor deformation. Thus the resistance in the corresponding stator winding phase is increased. Detecting such faults already in an early stage provides the possibility to react timely before a more severe fault occurs. This work presents a method to detect open-circuit winding-faults in an early stage without additional hardware. The method is based on the identification of the phase resistance by combination of measured current reaction to different voltage steps. A specific signal processing chain supplies a fault indictor able to detect the fault by magnitude and position.

   Global identification of mechanical and electrical parameters of asynchronous motor driven joint with a fast CLOE method
By Pierre-philippe ROBET, Maxime GAUTIER [View]
[Download]

Abstract: In many cases of new actuation of compliant controlled or bio-inspired joint driven robot, a global identification of electrical and mechanical coupled dynamics is required. This paper proposes a technique which mixes a closed loop output error method with the inverse dynamic identification model method which allows using linear least-squares technique to estimate the parameters. A first approach which has been validated on a DC motor allows a decoupled identification of the electrical and mechanical dynamics but fails to make a simultaneous identification. A major improvement of that method is proposed to carry out the coupled identification of both mechanical and electrical parameters. A validation on an asynchronous motor driven joint shows the effectiveness of the new procedure.

   IGBT Phase Leg Non-idealities in Active du/dt Output Filtering
By Juho TYSTER, Tommi KARKKAINEN, Juha-Pekka STROM, Juhamatti KORHONEN, Pertti SILVENTOINEN [View]
[Download]

Abstract: Active du/dt output filtering is a previously presented method to reduce the variable-speed AC drive cable reflection overvoltages. It uses a passive LC low-pass filter and a pulse pattern from IGBT phase leg to control the filter output voltage slopes. The pulse pattern has to be formed in accordance to the LC filter resonant frequency, and timing errors will show up as additional overshoot at the filter output voltage, eventually reaching motor as well. IGBT phase leg output voltage distortion versus the logic-level command timing affects the active du/dt filtering performance. This paper evaluates the most relevant error sources in an experimental setup for 22 kW motor with a filter for 200 m cable length. Analysis of the filter under timing errors based on measurement results is shown. The timing distortions have an effect, but in this particular case, the practical implications are not severe as the average overshoot due to timing errors was found to be in range on 10 \%.

   Improved current capacity utilization in current-controlled voltage-source converters with sequence decomposition
By Gonzalo CARRASCO, Cesar SILVA [View]
[Download]

Abstract: This paper shows a method to saturate the negative sequence current in an active rectifier. The goal isto utilize better the remaining current capacity of the converter, considering that the positive sequencecurrent references have already been decided in a separate synchronous reference frame.

   Mechanical Impact of Wind Turbine Frequency Support Strategies
By Nestor APARICIO, Christian CONCA, Salvador ANO-VILLALBA, Enrique BELENGUER, Ramon BLASCO-GIMENEZ [View]
[Download]

Abstract: New regulations require wind power plants to contribute to grid frequency control. Wind turbine droop control, inertia emulation and the use of a washout filter are compared in this paper in order to ascertain the influence of such methods on the mechanical components of the wind turbine. When wind generators operate below rated power, these methods use the stored kinetic energy to provide extra energy during a short period of time and hence enhance overall system frequency response. This paper includes the evaluation of the impact on the wind turbines of the aforementioned technologies, in a variety of scenarios, with a detailed model of the wind turbine. It is concluded that techniques that include a washout filter have similar performance to inertia emulation, but with without exciting lightly damped drive train modes.

   Model Predictive Current Control of Five Phase Permanent Magnet Motor
By Juan Manuel MORENO, Jose Luis ROMERAL MARTINEZ, Mehdi SALEHIFAR [View]
[Download]

Abstract: This paper deals with model predictive control of five phase permanent magnet motors. Using motor model, the stator currents are estimated for the following modulation period, and the required voltages are applied to minimize the current errors. A comparison between the proposed algorithm and conventionalcascade PI configuration is conducted.

   PMSM fed by 3-level NPC sinusoidal inverter with discrete state feedback controller
By Tomasz TARCZEWSKI, Lech GRZESIAK [View]
[Download]

Abstract: In this paper new discrete non-stationary linear-quadratic speed regulator for PMSM fed by 3-levelNPC sinusoidal inverter is presented. Controlled sinus wave inverter with an output LC filter was usedin order to reduce electromagnetic torque ripple of the motor. The novelty of the proposed controlsystem consists in one state feedback controller using in order to control the angular velocity of themotor as well as to provide true sine wave of the motor voltages. It was found that some gains of thedesigned discrete controller are non-stationary and depends on the angular velocity of the motor. Useof non-stationary controller causes, that linearization and decoupling process of the motor with LCfilter is not needed. Simulation test results of the designed control system are compared with resultsobtained for PMSM fed by classical 2-level inverter. Proposed control system can be used in industrialapplications where torque ripple minimization is needed instead high dynamic performance.

   Position Sensorless control in Overmodulation Range of Inverter for IPMSMwith Magnetic Non-linearity
By Toshiki NAKAMURA, Masaru HASEGAWA [View]
[Download]

Abstract: This paper proposes a novel position sensorless control in the overmodulation range of an inverter for IPMSMs with magnetic non-linearity. This paper describes the simultaneous achievement of (1) position sensorless control, (2) robust maximum torque per ampere control in consideration of the magnetic non-linearity in an IPMSM, and (3) robust overmodulation drives of the inverter. First, this paper describes the maximum torque control method based on a new mathematical model of an IPMSM. Next, this paper proposes a modification method for the voltage references. Finally, this paper shows the performances of the proposed method.

EPE 2013 - DS2e: Adjustable Speed Drives
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2013 ECCE Europe - Conference > EPE 2013 - Topic 11: Adjustable speed drives > EPE 2013 - DS2e: Adjustable Speed Drives
	[return to parent folder]

	Analysis of Current Harmonics in Inverter-Driven Interior Permanent Magnet Synchronous Machines By Tobias GEMASSMER, Michael BRAUN	[View] [Download]
Abstract: This paper presents the analysis of current harmonics in an inverter-driven interior permanent magnetmachine for different modulation methods. In contrast to other approaches, the influence of the saliency(Ld ≠ Lq) on the harmonics is being considered. By use of the rms-value of the currents, analyticallyclosed equations can be deduced and tedious Fourier analyses of single harmonics can be avoided.The derivation of the analytic equations is described and the results are verified by numerical simulationas well as by experimental results.

	Characteristics of Independent Control of Two Permanent Magnet Synchronous Motors Fed by a Four-Leg Inverter By Takayuki MOROI, Haruki TANAKA, Yuji KUBO, Kouki MATSUSE	[View] [Download]
Abstract: The four-leg inverter (4LI) which drives two induction motors have been studied, but the drives oftwo permanent magnet synchronous motors (PMSMs) fed by a four-leg inverter have not been studied.PMSMs can drive not only speed control but also position control. This paper shows thecharacteristics of two PMSMs independent drives fed by a 4LI. First, this paper shows the method of4LI to drive motor. The method of 4LI is expanded two-arm modulation and compensation of neutralvoltage in two capacitors. Next, this paper shows the experimental results of speed and positioncontrol. Finally, this paper shows conclusions

	Common mode voltage and zero sequence current reduction in an open-end load fed by a two-output indirect matrix converter By Javier RIEDEMANN, Ruben PENA, Roberto CARDENAS, Jon CLARE, Pat WHEELER, Marco RIVERA	[View] [Download]
Abstract: A Space Vector Modulation (SVM) strategy for an open-end load fed by an indirect matrix converterconsisting on one input stage and two output stages is presented. The modulation strategy aims toreduce the instantaneous common mode voltage and dynamically compensate the phase zero sequencecurrent.

	Detecting Incipient Stator Winding Conductor Faults in Inverter Fed Induction Machines By Goran STOJCIC, Markus VOGELSBERGER, Thomas WOLBANK	[View] [Download]
Abstract: In variable speed drive applications the inverter fed induction machine is one of the most reliable systems. However, increasing demands on efficiency leads to higher wear of all system components. Unexpected machine breakdowns cause economic losses and/or undesired scenarios in safety-critical areas. Thus condition monitoring of all components can reduce the risk of outages due to faults. High electrical and magnetic forces together with increased environmental stresses in rough application fields lead to a higher probability of stator winding faults. Beside inter-turn short-circuit faults open-circuit winding faults are under the most frequent types of faults. Open-circuit winding faults usually start with a crack or conductor deformation. Thus the resistance in the corresponding stator winding phase is increased. Detecting such faults already in an early stage provides the possibility to react timely before a more severe fault occurs. This work presents a method to detect open-circuit winding-faults in an early stage without additional hardware. The method is based on the identification of the phase resistance by combination of measured current reaction to different voltage steps. A specific signal processing chain supplies a fault indictor able to detect the fault by magnitude and position.

	Global identification of mechanical and electrical parameters of asynchronous motor driven joint with a fast CLOE method By Pierre-philippe ROBET, Maxime GAUTIER	[View] [Download]
Abstract: In many cases of new actuation of compliant controlled or bio-inspired joint driven robot, a global identification of electrical and mechanical coupled dynamics is required. This paper proposes a technique which mixes a closed loop output error method with the inverse dynamic identification model method which allows using linear least-squares technique to estimate the parameters. A first approach which has been validated on a DC motor allows a decoupled identification of the electrical and mechanical dynamics but fails to make a simultaneous identification. A major improvement of that method is proposed to carry out the coupled identification of both mechanical and electrical parameters. A validation on an asynchronous motor driven joint shows the effectiveness of the new procedure.

	IGBT Phase Leg Non-idealities in Active du/dt Output Filtering By Juho TYSTER, Tommi KARKKAINEN, Juha-Pekka STROM, Juhamatti KORHONEN, Pertti SILVENTOINEN	[View] [Download]
Abstract: Active du/dt output filtering is a previously presented method to reduce the variable-speed AC drive cable reflection overvoltages. It uses a passive LC low-pass filter and a pulse pattern from IGBT phase leg to control the filter output voltage slopes. The pulse pattern has to be formed in accordance to the LC filter resonant frequency, and timing errors will show up as additional overshoot at the filter output voltage, eventually reaching motor as well. IGBT phase leg output voltage distortion versus the logic-level command timing affects the active du/dt filtering performance. This paper evaluates the most relevant error sources in an experimental setup for 22 kW motor with a filter for 200 m cable length. Analysis of the filter under timing errors based on measurement results is shown. The timing distortions have an effect, but in this particular case, the practical implications are not severe as the average overshoot due to timing errors was found to be in range on 10 \%.

	Improved current capacity utilization in current-controlled voltage-source converters with sequence decomposition By Gonzalo CARRASCO, Cesar SILVA	[View] [Download]
Abstract: This paper shows a method to saturate the negative sequence current in an active rectifier. The goal isto utilize better the remaining current capacity of the converter, considering that the positive sequencecurrent references have already been decided in a separate synchronous reference frame.

	Mechanical Impact of Wind Turbine Frequency Support Strategies By Nestor APARICIO, Christian CONCA, Salvador ANO-VILLALBA, Enrique BELENGUER, Ramon BLASCO-GIMENEZ	[View] [Download]
Abstract: New regulations require wind power plants to contribute to grid frequency control. Wind turbine droop control, inertia emulation and the use of a washout filter are compared in this paper in order to ascertain the influence of such methods on the mechanical components of the wind turbine. When wind generators operate below rated power, these methods use the stored kinetic energy to provide extra energy during a short period of time and hence enhance overall system frequency response. This paper includes the evaluation of the impact on the wind turbines of the aforementioned technologies, in a variety of scenarios, with a detailed model of the wind turbine. It is concluded that techniques that include a washout filter have similar performance to inertia emulation, but with without exciting lightly damped drive train modes.

	Model Predictive Current Control of Five Phase Permanent Magnet Motor By Juan Manuel MORENO, Jose Luis ROMERAL MARTINEZ, Mehdi SALEHIFAR	[View] [Download]
Abstract: This paper deals with model predictive control of five phase permanent magnet motors. Using motor model, the stator currents are estimated for the following modulation period, and the required voltages are applied to minimize the current errors. A comparison between the proposed algorithm and conventionalcascade PI configuration is conducted.

	PMSM fed by 3-level NPC sinusoidal inverter with discrete state feedback controller By Tomasz TARCZEWSKI, Lech GRZESIAK	[View] [Download]
Abstract: In this paper new discrete non-stationary linear-quadratic speed regulator for PMSM fed by 3-levelNPC sinusoidal inverter is presented. Controlled sinus wave inverter with an output LC filter was usedin order to reduce electromagnetic torque ripple of the motor. The novelty of the proposed controlsystem consists in one state feedback controller using in order to control the angular velocity of themotor as well as to provide true sine wave of the motor voltages. It was found that some gains of thedesigned discrete controller are non-stationary and depends on the angular velocity of the motor. Useof non-stationary controller causes, that linearization and decoupling process of the motor with LCfilter is not needed. Simulation test results of the designed control system are compared with resultsobtained for PMSM fed by classical 2-level inverter. Proposed control system can be used in industrialapplications where torque ripple minimization is needed instead high dynamic performance.

	Position Sensorless control in Overmodulation Range of Inverter for IPMSMwith Magnetic Non-linearity By Toshiki NAKAMURA, Masaru HASEGAWA	[View] [Download]
Abstract: This paper proposes a novel position sensorless control in the overmodulation range of an inverter for IPMSMs with magnetic non-linearity. This paper describes the simultaneous achievement of (1) position sensorless control, (2) robust maximum torque per ampere control in consideration of the magnetic non-linearity in an IPMSM, and (3) robust overmodulation drives of the inverter. First, this paper describes the maximum torque control method based on a new mathematical model of an IPMSM. Next, this paper proposes a modification method for the voltage references. Finally, this paper shows the performances of the proposed method.