EPE Association: EPE 2007 - Subtopic 11-2 - LS: Topics in modern AC motor control

EPE 2007 - Subtopic 11-2 - LS: Topics in modern AC motor control
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2007 - Conference > EPE 2007 - Topic 11: 'Adjustable speed drives' > EPE 2007 - Subtopic 11-2 - LS: Topics in modern AC motor control

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   A Novel Control Algorithm of a Three-phase PWM Inverter with Output LC Filter
By CHOI Chang-Ho; KIM Kwang-Seob; KWON Byung-Ki [View]
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Abstract: In this paper we introduce a novel control method of a three-phase PWM inverter with output LC filter. The transfer function of LC filter is the same as that of second order LPF(low pass filter) except that it has zero damping ratio. A simple method to implement second order LPF with damping ratio is adding resistor in series with reactor. But the series resistor cannot be used in real high power system because it consumes lots of energy being proportion to square of conducted current. So, proposed control strategy utilizes the measured capacitor voltages and voltage references of inverter to damp LC filter resonance instead of a series resistor. The overall transfer function is the same as second order LPF and damping ratio is also controllable via control variables. Experimental waveforms are presented to verify LC filter control algorithm.

   Control of Induction Motor Drives Equipped with Small DC-Link Capacitance
By HARNEFORS Lennart; LUOMI Jorma; HINKKANEN Marko [View]
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Abstract: The paper deals with control of induction motor drives equipped with a diode rectifier and a small dc-link capacitance. Neither an ac choke nor a dc choke is used. It is necessary to use dc-link stabilization control if the mains inductance is not very low. Conventional dc-link stabilization controllers rely on the current controller. If no input choke is used, however, the natural frequency of the dc link is higher than the current-control bandwidth, and the conventional stabilization methods cannot be used. This paper proposes a control algorithm based on direct manipulation of the stator voltage reference. Furthermore, a recently proposed field-weakening controller is modified to better suit the oscillating dc-link voltage. Design recommendations for the proposed scheme are presented. Simulation results of a 110-kW drive show that the proposed scheme stabilizes the dc link and the dynamic performance is comparable with that of the conventional drive.

   High Reliability Motor Control for Aerospace Applications
By BHATACHARYYA Deb; GOETZ Jay [View]
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Abstract: Weight penalties imposed on commercial and military systems uniquely challenge motion system designers to adhere to compact design rules without compromising robustness and product reliability. Platforms are converting from hydraulic and pneumatic power to electric drives to give system integrators the opportunity to integrate performance and diagnostic monitoring with high speed control algorithms using advanced control ICs. But opportunity comes with a cost, forcing the electrical designer to confront the difficult challenge of creating a design that is not only physically small and functionally demanding but also capable of working in an environment of high speed digital control ICs integrated tightly with high voltage/high current semiconductor switches. This paper addresses the use of a new Sensorless Control Topology called iMotion to implement entire motor control functionality in a small footprint suitable for use in aerospace. A digital control ASIC includes a robust sensorless Field Oriented Controller having all required functions including Built-In Test (BIT) and protection features for highly reliable control of a sine wave commutated PMAC motor. Two critical technologies, hardware based advanced control and use of HVIC components, have enabled designers to achieve the high level of performance required in fast control loops while operating within a high noise environment (dv/dt & di/dt). The co-location of iMotion ASIC controller, gate drivers, and feedback electronics into a very small package is discussed in this paper. Embedded hardware protection, diagnostic and monitoring functions are also dealt with. Test data highlight the important steady state performance characteristics and startup sequencing.

EPE 2007 - Subtopic 11-2 - LS: Topics in modern AC motor control
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2007 - Conference > EPE 2007 - Topic 11: 'Adjustable speed drives' > EPE 2007 - Subtopic 11-2 - LS: Topics in modern AC motor control
	[return to parent folder]

	A Novel Control Algorithm of a Three-phase PWM Inverter with Output LC Filter By CHOI Chang-Ho; KIM Kwang-Seob; KWON Byung-Ki	[View] [Download]
Abstract: In this paper we introduce a novel control method of a three-phase PWM inverter with output LC filter. The transfer function of LC filter is the same as that of second order LPF(low pass filter) except that it has zero damping ratio. A simple method to implement second order LPF with damping ratio is adding resistor in series with reactor. But the series resistor cannot be used in real high power system because it consumes lots of energy being proportion to square of conducted current. So, proposed control strategy utilizes the measured capacitor voltages and voltage references of inverter to damp LC filter resonance instead of a series resistor. The overall transfer function is the same as second order LPF and damping ratio is also controllable via control variables. Experimental waveforms are presented to verify LC filter control algorithm.

	Control of Induction Motor Drives Equipped with Small DC-Link Capacitance By HARNEFORS Lennart; LUOMI Jorma; HINKKANEN Marko	[View] [Download]
Abstract: The paper deals with control of induction motor drives equipped with a diode rectifier and a small dc-link capacitance. Neither an ac choke nor a dc choke is used. It is necessary to use dc-link stabilization control if the mains inductance is not very low. Conventional dc-link stabilization controllers rely on the current controller. If no input choke is used, however, the natural frequency of the dc link is higher than the current-control bandwidth, and the conventional stabilization methods cannot be used. This paper proposes a control algorithm based on direct manipulation of the stator voltage reference. Furthermore, a recently proposed field-weakening controller is modified to better suit the oscillating dc-link voltage. Design recommendations for the proposed scheme are presented. Simulation results of a 110-kW drive show that the proposed scheme stabilizes the dc link and the dynamic performance is comparable with that of the conventional drive.

	High Reliability Motor Control for Aerospace Applications By BHATACHARYYA Deb; GOETZ Jay	[View] [Download]
Abstract: Weight penalties imposed on commercial and military systems uniquely challenge motion system designers to adhere to compact design rules without compromising robustness and product reliability. Platforms are converting from hydraulic and pneumatic power to electric drives to give system integrators the opportunity to integrate performance and diagnostic monitoring with high speed control algorithms using advanced control ICs. But opportunity comes with a cost, forcing the electrical designer to confront the difficult challenge of creating a design that is not only physically small and functionally demanding but also capable of working in an environment of high speed digital control ICs integrated tightly with high voltage/high current semiconductor switches. This paper addresses the use of a new Sensorless Control Topology called iMotion to implement entire motor control functionality in a small footprint suitable for use in aerospace. A digital control ASIC includes a robust sensorless Field Oriented Controller having all required functions including Built-In Test (BIT) and protection features for highly reliable control of a sine wave commutated PMAC motor. Two critical technologies, hardware based advanced control and use of HVIC components, have enabled designers to achieve the high level of performance required in fast control loops while operating within a high noise environment (dv/dt & di/dt). The co-location of iMotion ASIC controller, gate drivers, and feedback electronics into a very small package is discussed in this paper. Embedded hardware protection, diagnostic and monitoring functions are also dealt with. Test data highlight the important steady state performance characteristics and startup sequencing.