EPE Association: EPE 2021 - Advanced PWM and Control Methods

EPE 2021 - Advanced PWM and Control Methods
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2021 ECCE Europe - Conference > EPE 2021 - Topic 04: Electrical Machines and Drive Systems > EPE 2021 - Advanced PWM and Control Methods

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   Comparative Analysis of the Effects of Integral Action and Disturbance Feedforward on Current Control of Voltage-Source Converters
By Ville PIRSTO [View]
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Abstract: This paper presents a comparison between integral action and disturbance feedforward in current control of grid converters. The current controllers are designed directly in the discrete-time domain with the objective of similar reference-tracking and disturbance-rejection performance under nominal conditions. Partial compensation of time delays is included in the controller designs. The analytically and experimentally compared properties, in addition to reference tracking and disturbance rejection, are noise sensitivity and robustness to grid impedance variations. The controllers are found to have comparable dynamic performance, although the realized disturbance-rejection performance of the integrator-based controller is slightly better. The disturbance-feedforward-based controller is found to be less susceptible to current measurement noise at the cost of having an additional entry point for noise through the voltage measurement. The integrator-based controller is found more robust to grid impedance variations.

   Development and Evaluation of Sensorless Control Systems for SPMSM Drives in the Extreme Low-Speed Region
By Alessandro BENEVIERI [View]
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Abstract: Sensorless algorithms for Permanent Magnet Synchronous Motors (PMSMs) are widely studied in the technical literature. Active methods are based on high-frequency voltage injection, have the advantage of working in the low-speed region and at standstill, but they have some drawbacks such as acoustic noise, additional losses, and torque ripple. Passive methods, on the other hand, do not require the injection of additional signals, however, their performance deteriorates significantly in the low-speed region. Many observers are studied in the technical literature. However, it is difficult to perform a fair comparison among the proposed algorithms since the conditions in which the experimental tests are carried out are always different. Indeed, different studies perform different tests (i.e., with different speed and torque profiles) and with different test benches. The aim of this paper is to make a fair comparison between four different passive algorithms, selected among the most promising proposed in the technical literature. For all the algorithms same tests are performed using the same Surface PMSM test bench.

   Lifetime Extension of Power Semiconductor Devices by Closed-Loop Junction Temperature Control
By Johannes RUTHARDT [View]
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Abstract: The lifetime of power semiconductor devices is mainly affected by the thermal stress they are exposed to. Especially temperature swings damage these devices due to different coefficients of thermal expansion of the material layers inside the device. This leads to mechanical strain between these layers. This paper proposes a closed loop junction temperature control system, which is able to reduce occurring temperature swings in order to reduce the damage and to extend the expected lifetime. An online junction temperature measurement is required in order to obtain information about the real-time temperature. This is realized by measuring the temperature sensitive on-resistance of the used MOSFET. Then, the junction temperature is estimated with a calibration curve. Another requirement is the possibility to influence the junction temperature during operation. Therefore, the switching frequency is varied to affect the switching losses. This influences the junction temperature. In addition, a set-value generator is presented, which generates suitable set values to reduce temperature swings.

   Transient Power Control Algorithm for a Dual Active Bridge
By Nikolas MENGER [View]
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Abstract: This paper presents a novel approach for transitions between operating points for the dual active bridgeconverter. The method is applicable to arbitrary modulation schemes. Steady state operation is attainedafter one switching period while the correct power transfer during the transition is ensured. The paperoutlines the analytical deriviation of the method. Simulation results and measurement data validate theapproach.

EPE 2021 - Advanced PWM and Control Methods
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2021 ECCE Europe - Conference > EPE 2021 - Topic 04: Electrical Machines and Drive Systems > EPE 2021 - Advanced PWM and Control Methods
	[return to parent folder]

	Comparative Analysis of the Effects of Integral Action and Disturbance Feedforward on Current Control of Voltage-Source Converters By Ville PIRSTO	[View] [Download]
Abstract: This paper presents a comparison between integral action and disturbance feedforward in current control of grid converters. The current controllers are designed directly in the discrete-time domain with the objective of similar reference-tracking and disturbance-rejection performance under nominal conditions. Partial compensation of time delays is included in the controller designs. The analytically and experimentally compared properties, in addition to reference tracking and disturbance rejection, are noise sensitivity and robustness to grid impedance variations. The controllers are found to have comparable dynamic performance, although the realized disturbance-rejection performance of the integrator-based controller is slightly better. The disturbance-feedforward-based controller is found to be less susceptible to current measurement noise at the cost of having an additional entry point for noise through the voltage measurement. The integrator-based controller is found more robust to grid impedance variations.

	Development and Evaluation of Sensorless Control Systems for SPMSM Drives in the Extreme Low-Speed Region By Alessandro BENEVIERI	[View] [Download]
Abstract: Sensorless algorithms for Permanent Magnet Synchronous Motors (PMSMs) are widely studied in the technical literature. Active methods are based on high-frequency voltage injection, have the advantage of working in the low-speed region and at standstill, but they have some drawbacks such as acoustic noise, additional losses, and torque ripple. Passive methods, on the other hand, do not require the injection of additional signals, however, their performance deteriorates significantly in the low-speed region. Many observers are studied in the technical literature. However, it is difficult to perform a fair comparison among the proposed algorithms since the conditions in which the experimental tests are carried out are always different. Indeed, different studies perform different tests (i.e., with different speed and torque profiles) and with different test benches. The aim of this paper is to make a fair comparison between four different passive algorithms, selected among the most promising proposed in the technical literature. For all the algorithms same tests are performed using the same Surface PMSM test bench.

	Lifetime Extension of Power Semiconductor Devices by Closed-Loop Junction Temperature Control By Johannes RUTHARDT	[View] [Download]
Abstract: The lifetime of power semiconductor devices is mainly affected by the thermal stress they are exposed to. Especially temperature swings damage these devices due to different coefficients of thermal expansion of the material layers inside the device. This leads to mechanical strain between these layers. This paper proposes a closed loop junction temperature control system, which is able to reduce occurring temperature swings in order to reduce the damage and to extend the expected lifetime. An online junction temperature measurement is required in order to obtain information about the real-time temperature. This is realized by measuring the temperature sensitive on-resistance of the used MOSFET. Then, the junction temperature is estimated with a calibration curve. Another requirement is the possibility to influence the junction temperature during operation. Therefore, the switching frequency is varied to affect the switching losses. This influences the junction temperature. In addition, a set-value generator is presented, which generates suitable set values to reduce temperature swings.

	Transient Power Control Algorithm for a Dual Active Bridge By Nikolas MENGER	[View] [Download]
Abstract: This paper presents a novel approach for transitions between operating points for the dual active bridgeconverter. The method is applicable to arbitrary modulation schemes. Steady state operation is attainedafter one switching period while the correct power transfer during the transition is ensured. The paperoutlines the analytical deriviation of the method. Simulation results and measurement data validate theapproach.