Vodenje simetričnega trojnega trifaznega stroja

DELAVEC, JURE (author), Nemec, Mitja (mentor)

Magistrsko delo obravnava uporabo primerne programske in strojne opreme za regulacijo večfaznih strojev. V uvodnem delu je predstavljen model klasičnega trifaznega sinhronskega motorja s poudarkom na napetostnem modelu v koordinatnem sistemu rotorskega polja, saj s pomočjo tega modela sledi tudi kasnejša teorija FOC. V nadaljevanju smo se osredotočili in predstavili dva tipa večfaznih motorjev, in sicer trojni trifazni sklopljen in razklopljen motor. V osrednjem delu je predstavljen uporabljen 9-fazni razsmernik in uporabljena programska oprema. Najprej je razložena teorija pulzno širinske modulacije s poudarkom na vektorski modulaciji oziroma SVM, nato pa je bolj podrobno predstavljeno generiranje PWM s pomočjo mikrokrmilnika. V nadaljevanju so predstavljeni različni regulacijski pristopi za oba tipa motorjev in prikaz njihove učinkovitosti v realnem sistemu. Pri motorju brez elektromagnetne sklopitve smo realizirali regulacijo toka enega sistema, regulacijo povprečnega toka treh sistemov in regulacijo toka vsakega posameznega sistema in prav zadnja možnost se je izkazala za najbolj natančno in učinkovito. Pri motorju z elektromagnetno sklopitvijo pa smo realizirali regulacijo povprečnega toka treh sistemov, regulacijo toka vsakega posameznega sistema in regulacijo s pomočjo glavnega povprečnega regulatorja toka in dodatnih regulatorjev razlike od povprečja. V tem primeru se je najbolje odnesel pristop z glavnim regulatorjem povprečja in dodatnimi regulatorji razlike, saj le ta možnost zagotovi dober odziv sistema in ne povzroča asimetrije toka. V zaključku smo izvedli tudi analizo vpliva zamika proženja PWM med posameznimi trifaznimi sistemi v motorju na valovitost enosmernega toka razsmernika in analizo delovanja motorja v primeru izpada enega trifaznega sistema v motorju.

• Language: Slovenian
• Keywords: Večfazni stroji, PWM, regulacijski pristopi, razsmernik.
• Work type: Master's thesis/paper
• Organization: FE - Faculty of Electrical Engineering
• Year: 2019
• PID: 20.500.12556/RUL-107551
• Publication date in RUL: 25.04.2019

Secondary language

• Language: English
• Title: Control of symmetric triple three-phase machine

Abstract

The master thesis discusses the use of suitable software and hardware for the control of multiphase machines. The introduction presents the model of the classical three-phase synchronous motor, with emphasis on the voltage model in the rotor field coordinate system, as a base for FOC model. This is followed by presentation of two types of multi-phase motors, namely the triple three-phase-coupled and de-coupled motor. The central part describes software and hardware (9-phase inverter) for control of multi-phase motors. In the beginning, the theory of pulse width modulation with the emphasis on vector modulation or SVM is explained, and then the generation of PWM using a microcontroller is presented in more detail. Then, different types of control for both types of motors are presented and their performance is demonstrated in the real system. In the case of a motor without electromagnetic coupling, we implemented the control of the current of one system, the control of the average current of the three systems and the control of the current of each individual system. The last option proved to be the most accurate and efficient. In the case of a electromagnetic coupling between the systems, we implemented the control of the average current of the three systems, the control of the current of each individual system, and the control of the average current with additional controllers of the difference from the average for each system. In this case, the approach with the main average controller and additional differential controllers was most suitable as only this option ensures a good system response and does not cause current asymmetry. Finally we also made an analysis of the influence of the delay of the PWM triggering between the individual three-phase systems on the supply current waveform and the analysis of the motor's operation in the event of a failure of one three-phase system in the motor.

• Keywords: Multiphase machines, PWM, different types of regulation, inverter.