9818246816

Zeszyły Problemowe - Maszyny Elektryczne Nr 86/2010

AUTONOMICZNA PRĄDNICA INDUKCYJNA Z KASKADOWYM FALOWNIKIEM NAPIĘCIA

AUTONOMOUS INDUCTION GENERATOR WITH CASCADED VOLTAGE INVERTER

Abstract: In the papcr a freąuency and voltage stabilisation system of autonomous. self-excited induction generator (API) is presented. Electrical energy with uncontrolled parameters. produced by API is comerted to sin wave output energy with constant freąuency and vo!tage with the help of a Cascade imerter. Output volt-age stabilisation is performed in the DC intennediate Circuit of the im erter. The conlrol strategy and the way of adding voltages in the Cascade imerter which allow to eliminate the most significant harmonics up to as-sumcd harmonie number is defined. Simulation results are enclosed.

Marek Niechaj Politechnika Lubelska, Lublin

NUMERYCZNY MODEL FOTOWOLTAICZNEGO SYSTEMU NAPĘDOWEGO Z MAKSYMALIZACJĄ MOCY OPARTĄ NA DODATNIM SPRZĘŻENIU ZWROTNYM

NUMER1CAL MODEL OF PHOTOVOLTAIC DRIVE SYSTEM WITH MPP TRACKER BASED ON POSITIVE FEEDBACK

Abstract: The paper deals with numerical model of the system with photovoltaic generator feeding the DC commutator motor with permanent magnet excitement, by DC buck chopper. The motor drives its load of fan characteristic - centrifugal water pump. The system is of Stand-Alone type. and without the electric buffer source (electrochemical accumulator or supercapacitor). The simple Circuit for Maximum Power Point track-ing. with positive feedback from average value of motor's armaturę voltage. has been applied in this system. The real System s diagram is presented and shortly described. The numerical model of the whole real system has been created in TCAD simulation software. This modeTs diagram is presented and described in details. The model of PV generator enables simple modeling of generators cells insolation changes. and also different temperatures of the cells. independently. The results of Computer simulations of such tran-sient States as: start-ups of the motor for different PV cells insolation and temperaturę values, and linear in-creases and decreases of insolation, are presented. The good points and shorteomings of the described system and its model are rccapitulated in the conclusions.

Jan Anuszczyk, Andrzej Gocek Politechnika Łódzka, Łódź

HAMOWANIE POCIĄGÓW METRA Z NAPĘDEM PRĄDU STAŁEGO I PRZEMIENNEGO PRZY WYKORZYSTANIU SYSTEMU ATO

BRAKING OF UNDERGROUND TRAINS WITH AC AND DC DRIVE USING ATO SYSTEM

Abstract: The paper describes AC and DC drives used in underground trains and braking methods of underground trains cooperating with an Automatic Train Operation (ATO) system. A train drive with an AC motor