Tese
Topologia híbrida e métodos de controle aplicados à regulação de tensão de geradores de indução auto-excitados
Fecha
2016-05-23Registro en:
SCHERER, Lucas Giuliani. Hybrid topology and control methods applied to voltage
regulation of self-excited induction generators. 2016. 157 f. Tese (Doutorado em Engenharia Elétrica) - Universidade Federal de Santa Maria, Santa Maria, 2016.
Autor
Scherer, Lucas Giuliani
Institución
Resumen
This doctoral thesis deals with the study, analysis and development of a new hybrid
topology for voltage regulation of stand-alone microgeneration systems employing
self-excited induction generators. The hybrid topology proposed considers a three-phase
four-wire system and employs a distribution static synchronous compensator (DSTATCOM)
in combination with banks of switchable capacitors (BCC) to perform the regulation
of the terminal voltages of the induction generator. As a result of using the proposed
topology, it is expected the regulation of the amplitude of the terminal voltages of the
induction generator, with effective reduction of the power processed by DSTATCOM,
regardless of the characteristic of the applied load. Therefore, it is considered the compensation
of reactive currents of the system in terms of phase, amplitude and shape,
performed by a suitable control system. The control structure applied to control the DSTATCOM
and the switching of BCC ensures the regulation of voltages with low harmonic
distortion (THD) and reduced distortion factor among voltages, in addition to keeping
the generator currents sinusoidal and balanced. This thesis also investigates two distinct
forms of frequency control using the electronic load control: (i) auxiliary load controlled by
chopper element connected to the DC bus DSTATCOM and (ii) auxiliary load controlled
by chopper element connected to the AC bus system through non-controlled three-phase
rectifier. Simulation and experimental results are presented to validate and demonstrate
the suitable performance of the proposed hybrid topology in the regulation of voltages
and system frequency. The system is tested by load transient including three-phase and
single-phase loads, linear and non-linear loads, resistive and reactive loads.