Krmilnik brezkrtačnega motorja za uporabo v samostojnem fotovoltaičnem sistemu

MLAKAR, MIHA (author), Jankovec, Marko (mentor)

To diplomsko delo predstavlja načrtovanje in izvedbo samostojnega sistema za pogon brezkrtačnega motorja s pomočjo fotovoltaičnega modula, in sicer gre za pogon obtočne črpalke za kroženje bazenske vode. Običajno so tako imenovani samostojni fotovoltaični sistemi zgrajeni okrog baterijske banke, ki shranjuje viške energije, kadar je le te preveč, in zagotavlja energijo v času, ko sonca ni. Pri kroženju bazenske vode to ni tako bistveno, baterije pa bi pomenile dodatni strošek, težo in volumen sistema, zato je bil eden glavnih ciljev, da se bateriji izognemo. Ker v tem primeru zalogovnika energije ni, je bilo potrebno zagotoviti, da sistem stalno prilagaja moč delovanja zelo dinamičnim trenutnim razmeram osončenja. Sistem ima zato izvedeno sledenje točki maksimalne moči na fotovoltaičnem modulu [1]. S pomočjo pulzno širinske modulacije (PŠM) [2] prilagaja moč črpalke tako, da je le ta v vsakem trenutku enaka trenutni razpoložljivi moči fotovoltaičnega modula. Na mikrokrmilniku, ki nadzira delovanje celotnega sistema, teče operacijski sistem v realnem času, kar omogoča hiter odziv na spremembe razmer in zanesljivo delovanje. Sistem omogoča tudi priključitev drugih 24 V bremen in delovanje motorja s stalno močjo, nekatere parametre vezja pa je moč nastavljati na vgrajenem prikazovalniku LCD, kjer lahko opazujemo tudi trenutne razmere delovanja sistema.

• Language: Slovenian
• Keywords: fotovoltaika, otočni sistemi, krmilnik, MPPT, brezkrtačni motor
• Work type: Undergraduate thesis
• Organization: FE - Faculty of Electrical Engineering
• Year: 2016
• PID: 20.500.12556/RUL-84955
• Publication date in RUL: 08.09.2016

Secondary language

• Language: English
• Title: Brushless motor driver designed for standalone photovoltaic system

Abstract

This diploma thesis presents the development of a brushless motor controller, powered by a photovoltaic module, incorporating a maximum power point tracking algorithm. This is essentially an off grid photovoltaic system powering a circulation pomp in a home swimming pool. Off grid photovoltaic systems are normally built around a battery bank that serves as a storage for excess energy during high insolation and supplies loads when solar power is not available. This flexibility is not essential to be used in a swimming pool water circulation system. A battery bank would only present additional cost to the system and require more space for the installation, therefore one of the main goals was to design the system that can operate without the battery. Such a system has to be able to control pump power in real time to constantly track the maximum power point on the photovoltaic module. A microcontroller is used to measure the system's parameters and control the motor, and real time operating system provides fast transient response and high system reliability. The system also allows the supply of other 24V loads and includes a constant power mode. An LCD screen is added where basic measured parameters are displayed.

• Keywords: photovoltaics, off-grid systems, controller, MPPT, brushless motor