Sonderkolloquium Dr. Alzola /13.05.2016
13.05.2016 von 11:00 bis 12:00
Institut Ostufer, Kaiserstraße 2, 24143 Kiel, Raum: Geb. D, "Aquarium"
Titel: "Design and resonance-damping of LCL-filter based grid-tie
converters and recent developments on power electronics control"
Abstract - The first part of the lecture will deal with LCL-filter based
three-phase grid-tie converters. Adopting an LCL-filter, instead of an
L-filter, allows using a reduced value for the total inductance and so
reducing losses and preserving dynamics. However, stability problems can
arise if the present resonance is not properly damped. Passive damping
uses additional resistors and active damping modifies the control
algorithm. Many solutions have been proposed in a vast amount of
publications. For this lecture, different configurations for passive
damping will be explained along with the following active damping
procedures: lead-lag network, capacitor-current feedback and notch
filter. Stability and robust design against grid line inductance
variations will also be considered. The last part of the lecture
explores the opportunity of harmonic mitigation at distribution level in
small hybrid ac/dc building by using a centralized power factor
corrector (PFC) with large bandwidth. It is foreseeable an increased
presence of hybrid ac/dc buildings with coexisting ac and dc
infrastructures because of the unprecedented expansion of native dc
powered equipment (LEDs and consumer electronics). The proposals provide
all the steps for the straightforward control design of the PFC and its
harmonic mitigation function (HMF) with fast calculations. The HMF
requires only software modifications in the PFC and one sensor to
measure the nonlinear load.