Nove metode strujnog upravljanja pretvaračima energetske elektronike

Abstract

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.