EPE Association: EPE 2017 - DS2d: Application of Control Methods to Electrical Systems

EPE 2017 - DS2d: Application of Control Methods to Electrical Systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2017 ECCE Europe - Conference > EPE 2017 - Topic 03: Measurement and Control > EPE 2017 - DS2d: Application of Control Methods to Electrical Systems

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   A study on position sensorless control without any q-axis inductance by using Extended Electromotive Force with High frequency signal injection
By Shota KONDO [View]
[Download]

Abstract: This paper describes sensitivity analysis to q-axis inductance variation of the position estimation usingExtended Electromitive Force (EEMF) excited by High Frequency (HF) signal injection based on themathematical formula evaluation, and it shows that the influence on the q-axis inductance variation isvery small. Finally, experimental results indicate that position estimation can be performed well withoutany q-axis inductance information.

   Active damping of common-mode oscillations in electric drive systems using direct current control
By Maximilian SCHMITT [View]
[Download]

Abstract: In electrical systems parasitic capacitances are forming resonant circuits in combination with the inductances of the system. Each inverter switching operation is stimulating common-mode oscillations in these resonant circuit which can lead to critical overvoltages at the motor terminals. These voltages could damage the insulation system of the electrical machine and reduce the service life of the drive. An active damping method reducing common-mode oscillations by influencing the inverter pulse pattern is presented in this paper. Simulation results are shown, comparing the operation of a direct current controlled inverter with a classical pulse width modulation controlled inverter. By using the new control algorithm with active damping method, the voltage at the motor terminals can be reduced to non-critical values.

   Energy efficiency of a SiC MOSFET propulsion inverter accounting for the MOSFET's reverse conduction and the blanking time
By Alessandro ACQUAVIVA [View]
[Download]

Abstract: MOSFET devices have a body diode that allows reverse conduction, additionally, when a negative drainsourcevoltage is present, the MOSFET channel conduction can also be controlled by applying a gatesourcevoltage above the threshold voltage level. In a three phase inverter this results in parallel conductionof the diode and MOSFET when voltage and current differ in sign. This paper analyzes the beneficialeffect of parallel operation of the two devices, taking into account the blanking time, on the conductionlosses and total efficiency for a three phase SiC MOSFET inverter for traction application in electrifiedvehicles. The losses of the inverter are derived and presented as an analytical expression and comparedwith a numerical implementation showing a perfect match of the two. The total losses and efficiency ofthe inverter are derived and analyzed with and without reverse conduction for different operating points.

   Frequency-Domain Analysis for Design of the Current Control System of PMSM based on Model Predictive Control
By Shizuka YOKOYAMA [View]
[Download]

Abstract: This paper describes a method of deriving frequency characteristics of PMSM current control systembased on Model Predictive Control (MPC). MPC controller predicts the current behavior using the math-ematical model of PMSM and directly selects the optimal switch state based on evaluation of thesepredicted results. So, we have focused the possibility of MPC, which makes it possible to drive ma-chines seamlessly between linear operating region of inverter and the overmodulation operating region.But, MPC is a nonlinear control system, so its frequency characteristics are unknown. In this paper, wederive MPC's frequency characteristic approximately through simulation to realize its frequency domaindesign.

   Minimizing torque ripple in PMSM drive by cuckoo search algorithm
By Stefan BROCK [View]
[Download]

Abstract: Torque pulsation in permanent magnet synchronous motor impairs their performance in critical applications, particularly for direct-drive. A practical approach to compensation of selected torque harmonics is presented. The approach consists of two steps: identification of dominant torque harmonics (the cogging harmonics and the flux linkage harmonics) and cuckoo search algorithm to tune the compensation algorithm. The sum of speed variation index is used as optimum criteria. The design of a ripple compensation scheme is based on the fast current controller. The experimental results are also presented. Proposed approach can be used as an automated self-commissioning scheme.

   Sensorless start-up of soft starter driven IE4 motors
By Heiko ZATOCIL [View]
[Download]

Abstract: This paper presents a sensorless starting procedure for a soft starter driven IE4 direct on line permanentmagnet synchronous motor (PMSM). First, the initial position of the rotor is determined using a pulsatingcurrent space vector. Subsequently, the motor is started from standstill by the soft starter from a knownposition. The following _ring sequences are calculated on the basis of the _ux angle and speed estimatedby a reduced Luenberger observer, which needs no additional sensors besides those provided in a standardindustrial soft starter. Measurements clearly indicate the potential performance of this starting procedure.

   Spectrum Analysis of a Voltage Source Converter due to Semiconductor Voltage Drops
By Tonny RASMUSSEN [View]
[Download]

Abstract: It is known that power electronic voltage source converters are non-ideal. This paper presents a state-of-the-art review on the effect of semiconductor voltage drop on the output voltage spectrum, using single-phase H-bridge two-level converter topology with natural sampled pulse width modulation. The paper describes the analysis of output voltage spectrum, when the semiconductor voltage drop is added. The results of the analysis of the spectral contribution including and excluding semiconductor voltage drop reveal a good agreement between the theoretical results, simulations and laboratory experiments measurements.

   Start-up Control of a HVDC Grid Based on MMC with Integrating Large-Scale Wind Farms
By Xiao ZHOU [View]
[Download]

Abstract: With the rapid development of voltage source converter (VSC) based high voltage direct current (HVDC) transmission technology, the HVDC grid will be an effective solution for large-scale renewable energy generations integration. The modular multilevel converter (MMC) is one the most promising topology for HVDC and DC grid presently. The precharging of the MMCs and start-up of DC grid are essential problems. This paper studies the sequential start-up control of the VSC-HVDC grid with wind farms integration. After the control of system discussed, the precharging mechanism of MMC is analyzed. A coordinated start-up control scheme of a DC grid with integrating large-scale wind farms is presented as well as sequential start-up control methods under typical operation modes with HVDC breakers are also investigated. Cases studied are carried on a four-terminal HVDC grid model in PSCAD/EMTDC to verify the proposed schemes.

EPE 2017 - DS2d: Application of Control Methods to Electrical Systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2017 ECCE Europe - Conference > EPE 2017 - Topic 03: Measurement and Control > EPE 2017 - DS2d: Application of Control Methods to Electrical Systems
	[return to parent folder]

	A study on position sensorless control without any q-axis inductance by using Extended Electromotive Force with High frequency signal injection By Shota KONDO	[View] [Download]
Abstract: This paper describes sensitivity analysis to q-axis inductance variation of the position estimation usingExtended Electromitive Force (EEMF) excited by High Frequency (HF) signal injection based on themathematical formula evaluation, and it shows that the influence on the q-axis inductance variation isvery small. Finally, experimental results indicate that position estimation can be performed well withoutany q-axis inductance information.

	Active damping of common-mode oscillations in electric drive systems using direct current control By Maximilian SCHMITT	[View] [Download]
Abstract: In electrical systems parasitic capacitances are forming resonant circuits in combination with the inductances of the system. Each inverter switching operation is stimulating common-mode oscillations in these resonant circuit which can lead to critical overvoltages at the motor terminals. These voltages could damage the insulation system of the electrical machine and reduce the service life of the drive. An active damping method reducing common-mode oscillations by influencing the inverter pulse pattern is presented in this paper. Simulation results are shown, comparing the operation of a direct current controlled inverter with a classical pulse width modulation controlled inverter. By using the new control algorithm with active damping method, the voltage at the motor terminals can be reduced to non-critical values.

	Energy efficiency of a SiC MOSFET propulsion inverter accounting for the MOSFET's reverse conduction and the blanking time By Alessandro ACQUAVIVA	[View] [Download]
Abstract: MOSFET devices have a body diode that allows reverse conduction, additionally, when a negative drainsourcevoltage is present, the MOSFET channel conduction can also be controlled by applying a gatesourcevoltage above the threshold voltage level. In a three phase inverter this results in parallel conductionof the diode and MOSFET when voltage and current differ in sign. This paper analyzes the beneficialeffect of parallel operation of the two devices, taking into account the blanking time, on the conductionlosses and total efficiency for a three phase SiC MOSFET inverter for traction application in electrifiedvehicles. The losses of the inverter are derived and presented as an analytical expression and comparedwith a numerical implementation showing a perfect match of the two. The total losses and efficiency ofthe inverter are derived and analyzed with and without reverse conduction for different operating points.

	Frequency-Domain Analysis for Design of the Current Control System of PMSM based on Model Predictive Control By Shizuka YOKOYAMA	[View] [Download]
Abstract: This paper describes a method of deriving frequency characteristics of PMSM current control systembased on Model Predictive Control (MPC). MPC controller predicts the current behavior using the math-ematical model of PMSM and directly selects the optimal switch state based on evaluation of thesepredicted results. So, we have focused the possibility of MPC, which makes it possible to drive ma-chines seamlessly between linear operating region of inverter and the overmodulation operating region.But, MPC is a nonlinear control system, so its frequency characteristics are unknown. In this paper, wederive MPC's frequency characteristic approximately through simulation to realize its frequency domaindesign.

	Minimizing torque ripple in PMSM drive by cuckoo search algorithm By Stefan BROCK	[View] [Download]
Abstract: Torque pulsation in permanent magnet synchronous motor impairs their performance in critical applications, particularly for direct-drive. A practical approach to compensation of selected torque harmonics is presented. The approach consists of two steps: identification of dominant torque harmonics (the cogging harmonics and the flux linkage harmonics) and cuckoo search algorithm to tune the compensation algorithm. The sum of speed variation index is used as optimum criteria. The design of a ripple compensation scheme is based on the fast current controller. The experimental results are also presented. Proposed approach can be used as an automated self-commissioning scheme.

	Sensorless start-up of soft starter driven IE4 motors By Heiko ZATOCIL	[View] [Download]
Abstract: This paper presents a sensorless starting procedure for a soft starter driven IE4 direct on line permanentmagnet synchronous motor (PMSM). First, the initial position of the rotor is determined using a pulsatingcurrent space vector. Subsequently, the motor is started from standstill by the soft starter from a knownposition. The following _ring sequences are calculated on the basis of the _ux angle and speed estimatedby a reduced Luenberger observer, which needs no additional sensors besides those provided in a standardindustrial soft starter. Measurements clearly indicate the potential performance of this starting procedure.

	Spectrum Analysis of a Voltage Source Converter due to Semiconductor Voltage Drops By Tonny RASMUSSEN	[View] [Download]
Abstract: It is known that power electronic voltage source converters are non-ideal. This paper presents a state-of-the-art review on the effect of semiconductor voltage drop on the output voltage spectrum, using single-phase H-bridge two-level converter topology with natural sampled pulse width modulation. The paper describes the analysis of output voltage spectrum, when the semiconductor voltage drop is added. The results of the analysis of the spectral contribution including and excluding semiconductor voltage drop reveal a good agreement between the theoretical results, simulations and laboratory experiments measurements.

	Start-up Control of a HVDC Grid Based on MMC with Integrating Large-Scale Wind Farms By Xiao ZHOU	[View] [Download]
Abstract: With the rapid development of voltage source converter (VSC) based high voltage direct current (HVDC) transmission technology, the HVDC grid will be an effective solution for large-scale renewable energy generations integration. The modular multilevel converter (MMC) is one the most promising topology for HVDC and DC grid presently. The precharging of the MMCs and start-up of DC grid are essential problems. This paper studies the sequential start-up control of the VSC-HVDC grid with wind farms integration. After the control of system discussed, the precharging mechanism of MMC is analyzed. A coordinated start-up control scheme of a DC grid with integrating large-scale wind farms is presented as well as sequential start-up control methods under typical operation modes with HVDC breakers are also investigated. Cases studied are carried on a four-terminal HVDC grid model in PSCAD/EMTDC to verify the proposed schemes.