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Nove metode strujnog upravljanja pretvaračima energetske elektronike
n this dissertation, the analysis, development and experimental
verification of new current mode control methods of power
electronics converters is performed, in order to obtain improved
performances compared to other relevant current mode control
methods. New proposed current mode control methods have been
developed by modification and improvement of the conventional dual
current mode control (DCMC) method, which besides its excellent
features, such as constant switching frequency, simple
implementation and stability for the entire range of duty cycle, has a
main drawback, and that is a current error – a difference between the
average and reference inductor current. Two ways for eliminating the
current error of DCMC method are proposed in this dissertation:
using an adaptive current bandwidth, which is equal to the measured
instantaneous peak-to-peak ripple of the inductor current, resulting in
a new adaptive dual current mode control (ADCMC) method;
inserting an inner current-loop compensator (application of I2
concept) in the DCMC structure, which leads to a new I2 DCMC
method. By using the I2 concept on ADCMC, a new I2 ADCMC
method is also derived.
After mathematical analysis and modelling, the operation of the
proposed current mode control methods, applied on three basic DCDC
converters: buck, boost and non-inverting buck-boost converter,
was tested with simulations in Matlab/Simulink. Afterwards,
development and realization of the experimental platform
(multipurpose converter’s prototype, control and measurement
electronic module), which is used for experimental verification of the
proposed control methods on different types of converters, were
performed.
The obtained simulation and experimental results confirmed the
excellent performances of the proposed current mode control
methods: equality between the average and reference inductor current,
stability for whole range of duty cycle, excellent dynamics of the
current loop, robustness to the input voltage and load disturbances of
converters, etc. Thanks to these qualities, the proposed control
methods can be applied to practically all types of converters.
Some new ideas for further improvements of the proposed control
methods and for their implementation in specific applications of
existing and some future converters topologies are also presented in
this dissertation