Simulacija pogona električnog broda

undergraduate thesis

• Title (english): Simulation of Electric Ship Drive
• Author: Ivan Sitar
• Mentor: Damir Žarko (mentor)
• Committee member: Damir Žarko (predsjednik povjerenstva)
• Committee member: Stjepan Stipetić (član povjerenstva)
• Committee member: Damir Vuljaj (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2017-09-13, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering

Abstract

U radu je provedena simulacija pogona električnog broda. Korišten je program Matlab, odnosno paket Simulink. Kao pogonski stroj korišten je asinkroni motor, a kao izvor energije istosmjerni naponski izvor (baterija). Budući da se motor napaja iz izmjeničnog izvora, provedena je DC/AC pretvorba. Kao model plovila izabran je mali putnički brod duljine oko 30 metara. Dimenzije broda i propelera temelje se na stvarnim podacima.
Na temelju iznosa frekvencije i indeksa modulacije (napona) koji se zadaje pretvaraču i kojeg on prosljeđuje dalje u sustav, odnosno asinkroni motor, simulacija određuje konačnu brzinu broda i odgovarajuću brzinu vrtnje propelera. Novo stacionarno stanje postiže se kada se sila poriva izjednači sa silom otpora, a moment motora izjednači s momentom propelera. Prilikom izračuna otpora broda uzeti su u obzir otpor trenja i tzv. preostali otpor. Sila poriva i moment propelera dobiveni su pomoću odgovarajućih koeficijenata iz Wageningen B serije. U simulaciji je također uzet u obzir i utjecaj transmisijskog mehanizma. Njegovim djelovanjem smanjena je brzina vrtnje koja se prenosi s motora na propeler, ali istovremeno i povećan iznos momenta koji je na raspolaganju za svladavanje momenta tereta.

Abstract (english)

This thesis describes the simulation of an electrical ship drive. The drive has been modelled in Matlab/Simulink programming environment. A source of power is provided by a DC voltage source (battery). The induction motor serves as the ship's power engine. Since this is an AC electric motor, the system also includes a DC/AC conversion circuit. A small passenger ship around 30 metres long was chosen as a vessel model. The dimensions of the ship and propeller are based on actual data.
The torque curve of the induction motor depends on set frequency and voltage. This in turn determines the final speed of the ship and the corresponding propeller speed. The new equilibrium is achieved when the thrust created by the propeller is equal to the force of ship resistance and the driving torque is equal to the load (propeller) torque. Ship resistance is composed of frictional and residual resistance. The obtained thrust and load torque were calculated using the appropriate coefficients from the Wageningen B series. The motor shaft is connected to the propeller using a transmission mechanism. The mechanism reduces the higher engine speed to the slower propeller speed. It also increases the developed torque which has a positive impact on motor-ship dynamics.

• Keywords: električna propulzija; otpor broda; brodski vijak; elektromotorni pogon; asinkroni motor
• Keywords (english): electric propulsion; ship resistance; ship propeller; electric drive; induction motor
• Language: croatian
• URN:NBN: urn:nbn:hr:168:118599
• Study programme: Title: Electrical Engineering and Information Technology; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka elektrotehnike i informacijske tehnologije (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka elektrotehnike i informacijske tehnologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2019-03-14 00:43:41