Resonant Control for H-Bridge Topologies based on Single-Phase Current-Source Inverters
Jaime A. Rohten C., Alumno Tesista de Doctorado en Ingeniería Eléctrica, LCDA - DIE. Nos presentará aspectos relacionados con su tema de investigación, el día Viernes 11 de Abril de 2014 a partir de las 16:00 horas.
This presentation deals with the control of a single-phase Current Source Inverter
(CSI) in a three-phase array which can be used for both power drives and PV
applications. Unlike in three-phase inverters, where the Fortescue or Park
Transformation can be applied in order to simplify the design of the controllers, for
single-phase systems they cannot be directly applied making the control a difficult
task if a rotating reference frame is chosen. On the other hand, Resonant Control (RC)
is a control strategy that allows working with sinusoidal references and ensuring zero
steady state error. This paper studies the resonant control of a single-phase CSI in a
three-phase array, considering a design in continuous as well as discrete time domain.
The resonant control is justified because the current sources should not be considered
equals at all times, leading to independent control loops in each phase, or each cell,
where the current source value and the load current can be feed-forward into the
controller, making the load voltage control in each cell easier to accomplish. To
corroborate the mathematical analysis, the proposed control scheme is tested under
different conditions, including a stability study.