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AC Induction Machine Field Weakening Algorithms
Mynář, Zbyněk ; Veselý, Libor (referee) ; Václavek, Pavel (advisor)
Nowadays, thanks to advances in information and power technology induction motors are deployed there, where previously only other types of electric motors were possible to use. Those typically lack the reliability and low cost of induction motors. Best results in control of induction motors are achieved when vector control is used, to which part of the work is paid. If induction motor reaches the speed when it is no longer possible to continue to increase stator voltage, there is possibility of field weakening or reduction of magnetic flux and thus achieve higher speed. A comparison of several algorithms is devoted to this work. As a simulation tool MATLAB-Simulink was used. Another part is devoted to implementation of these algorithms to the processor of 56F800E series which uses calculations in fixed point.
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Electrical Drives Predictive Control Algorithms
Mynář, Zbyněk ; Vavřín, Petr (referee) ; Václavek, Pavel (advisor)
This work deals with the predictive control algorithms of the AC drives. The introductory section contains summary of current state of theory and further description and classification of most significant predictive algorithms. A separate chapter is dedicated to linear model predictive control (linear MPC). The main contribution of this work is the introduction of two new predictive control algorithm for PMSM motor, both of which are based on linear MPC. The first of these algorithms has been created with the aim of minimizing its computational demands, while the second algorithm introduces the ability of field weakening. Both new algorithms and linear MPC were simulated in MATLAB-Simulink.
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HIGH POWER-EFFICIENT SENSORLESS CONTROL OF SYNCHRONOUS RELUCTANCE MOTOR
Mynář, Zbyněk ; Talla,, Jakub (referee) ; Lettl, Jiří (referee) ; Václavek, Pavel (advisor)
Synchronní reluktanční motory se pro svou relativně vysokou účinnost, robustnost a nízkou cenu stávají stále populárnější alternativou velmi rozšířených asynchronních motorů. Snaha o využití výhodných vlastností bezsnímačového řízení, a dosažení co nejvyšší účinnost jejich provozu, je však komplikována jejich výraznou nelinearitou způsobenou saturací magnetického obvodu. Úvod této práce je věnován popisu matematicko-fyzikálního modelu SynRM a přehledu existujících moderních algoritmů výkonově-optimálního bezsnímačového řízení. Jádrem práce je pak představení estimátoru stavů a parameterů SynRM postaveného na novém přístupu k měření a využití fázových reluktancí. Klíčovými prvky algoritmu jsou nová metodologie měření fázových reluktancí, spínací PWM schéma jež umožňuje snížit spínací ztráty a měřit fázové reluktance od nulových otáček, a nakonec integrace těchto měření s matematickým modelem SynRM s pomocí rozšířeného Kalmánova filtru. Experimentální část práce pak diskutuje výsledky reálných měření s navrženým algoritmem a vybranými současnými algoritmy.
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Power Optimized Control of Synchronous Reluctance Machine
Mynář, Zbyněk
Synchronous reluctance motor (SynRM) is becoming more and more popular alternative of AC induction motor (ACIM) for its low cost, rugged structure and possibility of higher power efficiency. Power optimized control of SynRM is, therefore, important topics of research. This paper proposes power optimizing control algorithm incorporating active search of optimal current angle according to the MTPA criterion using the DC current injection. Results of implementation on real machine are presented.
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AC Induction Machine Field Weakening Algorithms
Mynář, Zbyněk ; Veselý, Libor (referee) ; Václavek, Pavel (advisor)
Nowadays, thanks to advances in information and power technology induction motors are deployed there, where previously only other types of electric motors were possible to use. Those typically lack the reliability and low cost of induction motors. Best results in control of induction motors are achieved when vector control is used, to which part of the work is paid. If induction motor reaches the speed when it is no longer possible to continue to increase stator voltage, there is possibility of field weakening or reduction of magnetic flux and thus achieve higher speed. A comparison of several algorithms is devoted to this work. As a simulation tool MATLAB-Simulink was used. Another part is devoted to implementation of these algorithms to the processor of 56F800E series which uses calculations in fixed point.
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Electrical Drives Predictive Control Algorithms
Mynář, Zbyněk ; Vavřín, Petr (referee) ; Václavek, Pavel (advisor)
This work deals with the predictive control algorithms of the AC drives. The introductory section contains summary of current state of theory and further description and classification of most significant predictive algorithms. A separate chapter is dedicated to linear model predictive control (linear MPC). The main contribution of this work is the introduction of two new predictive control algorithm for PMSM motor, both of which are based on linear MPC. The first of these algorithms has been created with the aim of minimizing its computational demands, while the second algorithm introduces the ability of field weakening. Both new algorithms and linear MPC were simulated in MATLAB-Simulink.
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