EPE Association: EPE 2017 - DS3h: Multiscalar Control

EPE 2017 - DS3h: Multiscalar Control
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2017 ECCE Europe - Conference > EPE 2017 - Topic 04: Electrical Machines and Drive Systems > EPE 2017 - DS3h: Multiscalar Control

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   A Novel Speed Observer for Doubly-Fed Induction Generator
By Krzysztof BLECHARZ [View]
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Abstract: The purpose of this paper is to show a new state observer for doubly-fed generator. A proposed z-typeobserver algorithm based on mathematical model of doubly fed generator with additional variablestreated as a disturbances has been used. A nonlinear multiscalar control method has been used tocontrol active and reactive power of the generator. All analyses were verified by simulations andexperiments tests.

   Optimized Space Vector Modulation Strategy for Five Phase Voltage Source Inverter with Third Harmonic Injection
By Arkadiusz LEWICKI [View]
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Abstract: One of the advantages of a five-phase motor is to maximize the torque per ampere ratio where a quasi-rectangular air gap flux distribution is obtained. The problem is that the Space Vector Modulation (SVM) strategy, used in multiphase drives, proves to be a complex task. This is due to a mutual relation between voltage vectors in multiple orthogonal spaces. The main problem in SVM algorithms for multiphase inverters is to point a set of active voltage vectors with non-negative durations. Such a set of active vectors should be found in real-time and has to ensure a minimum number of transistor switching. This paper presents a simple and an effective SVM algorithm for five-phase Voltage-Source Inverters with the possibility to control independently the voltage vectors for fundamental and auxiliary orthogonal subspaces. The essential benefit is that output voltage is generated using only four active voltage vectors with limited numbers of switching. In the proposed solution, four active vectors are arbitrary chosen, independent of the positions of reference voltage vectors. The selected active vectors and the reference voltages are utilized only to calculate the on-time durations for transistors in any of the inverter phases. The selection of appropriate active voltage vectors, used to generate the inverter output voltage, is based on analysis of calculated durations. The proposed solution does not require any matrix inverting operation in the microprocessor. This makes the algorithm simple and efficient. The experimental results prove the proposed SVM strategy.

   Sensorless Multiscalar Control of Five-Phase Induction Machine with Inverter Output Filter
By Jaroslaw GUZINSKI [View]
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Abstract: The paper presents a complete solution for speed sensorless control system for five-phase induction motor with voltage inverter, LC filter and nonlinear control of combined fundamental and third harmonic flux distribution. The control principle, also known as multiscalar control, nonlinear control or natural variables control, is based on a use of properly selected scalar variables in control feedback to linearize controlled system. The combination of flux harmonic distribution is implemented for five phase induction motor with concentrated stator windings in two reference frames. Moreover, the speed sensorless drive operation was only possible with a dual observer structure for both reference frames. The nonlinear control structure and the observers are extended by LC filter model.

EPE 2017 - DS3h: Multiscalar Control
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2017 ECCE Europe - Conference > EPE 2017 - Topic 04: Electrical Machines and Drive Systems > EPE 2017 - DS3h: Multiscalar Control
	[return to parent folder]

	A Novel Speed Observer for Doubly-Fed Induction Generator By Krzysztof BLECHARZ	[View] [Download]
Abstract: The purpose of this paper is to show a new state observer for doubly-fed generator. A proposed z-typeobserver algorithm based on mathematical model of doubly fed generator with additional variablestreated as a disturbances has been used. A nonlinear multiscalar control method has been used tocontrol active and reactive power of the generator. All analyses were verified by simulations andexperiments tests.

	Optimized Space Vector Modulation Strategy for Five Phase Voltage Source Inverter with Third Harmonic Injection By Arkadiusz LEWICKI	[View] [Download]
Abstract: One of the advantages of a five-phase motor is to maximize the torque per ampere ratio where a quasi-rectangular air gap flux distribution is obtained. The problem is that the Space Vector Modulation (SVM) strategy, used in multiphase drives, proves to be a complex task. This is due to a mutual relation between voltage vectors in multiple orthogonal spaces. The main problem in SVM algorithms for multiphase inverters is to point a set of active voltage vectors with non-negative durations. Such a set of active vectors should be found in real-time and has to ensure a minimum number of transistor switching. This paper presents a simple and an effective SVM algorithm for five-phase Voltage-Source Inverters with the possibility to control independently the voltage vectors for fundamental and auxiliary orthogonal subspaces. The essential benefit is that output voltage is generated using only four active voltage vectors with limited numbers of switching. In the proposed solution, four active vectors are arbitrary chosen, independent of the positions of reference voltage vectors. The selected active vectors and the reference voltages are utilized only to calculate the on-time durations for transistors in any of the inverter phases. The selection of appropriate active voltage vectors, used to generate the inverter output voltage, is based on analysis of calculated durations. The proposed solution does not require any matrix inverting operation in the microprocessor. This makes the algorithm simple and efficient. The experimental results prove the proposed SVM strategy.

	Sensorless Multiscalar Control of Five-Phase Induction Machine with Inverter Output Filter By Jaroslaw GUZINSKI	[View] [Download]
Abstract: The paper presents a complete solution for speed sensorless control system for five-phase induction motor with voltage inverter, LC filter and nonlinear control of combined fundamental and third harmonic flux distribution. The control principle, also known as multiscalar control, nonlinear control or natural variables control, is based on a use of properly selected scalar variables in control feedback to linearize controlled system. The combination of flux harmonic distribution is implemented for five phase induction motor with concentrated stator windings in two reference frames. Moreover, the speed sensorless drive operation was only possible with a dual observer structure for both reference frames. The nonlinear control structure and the observers are extended by LC filter model.