Design of AC-DC Grid Connected Converter using Multi-Objective Optimization

Abstract

Power electronic circuits, in particular AC-DC converters are complex systems, many different parameters and objectives have to be taken into account during the design process. Implementation of Multi-Objective Optimization (MOO) seems to be attractive idea, which used as designer supporting tool gives possibility for better analysis of the designed system. This paper presents a short introduction to the MOO applied in the field of power electronics. Short introduction to the subject is given in section I. Then, optimization process and its elements are briefly described in section II. Design procedure with proposed optimization parameters and performance indices for AC-DC Grid Connected Converter (GCC) interfacing distributed systems is introduced in section III. Some preliminary optimization results, achieved on the basis of analytical and simulation study, are shown at each stage of designing process. Described optimization parameters and performance indices are part of developed global optimization method dedicated for AC-DC GCC introduced in section IV. Described optimization method is under development and only short introduction and basic assumptions are presented. In section V laboratory prototype of high efficient and compact 14 kVA AC-DCconverter is introduced. The converter is elaborated based on performed designing and optimization procedure with the use of silicon carbide (SiC) power semiconductors. Finally, the paper is summarized and concluded in section VI. In presented work theoretical research are conducted in parallel with laboratory prototyping e.g. all theoretical ideas are verified in laboratory using modern DSP microcontrollers and prototypes of the AC-DC GCC.

Fuzzy logic in decision support system as a simple Human/Internet of Things interface for shunt active power filter

“…It should be stressed that functionality of GC strongly depends on control algorithm assumptions and current measurements placement. The hardware of the AC-DC converter can be the same, but the values of the passive element (inductances of chokes and capacitances) should be calculated for a specified application [2,17,28].…”

“…The research on the subject is being continued and will be integrated with a multi-objective optimization [17,18] process of the GC, where not only hardware, but also software assumptions have an impact on overall efficiency, reliability, and functionality of the GC. This paper is focused on GC operated as SAPF, and it is organized as follows: an introduction with problem description and basics knowledge about SAPF and its control requirements, a brief overview of literature regarding power quality, FL, the IoT and its multidisciplinary character, the main issues and the thesis of the paper, and the paper contest.…”

Application of 25mΩ SiC MOSFETs in a 10kVA Grid-Connected AC/DC Converter

“…Thus, a design process of the AC/DC converter may be conducted in two main directions: the increase of efficiency at the same switching frequency or the increase of the switching frequency to reduce passive elements size weight. According to author analysis it is possible to find optimal solution between two main directions: reasonable efficiency and power density by means of multi-objective optimization process [4]. The optimization procedure takes into account power losses, volume and weight of semiconductors, a cooling system as well as passive elements of the LCL filter [4].…”

Dedicated system for design, analysis and optimization of AC-DC converters

“…Thus, for example, the designer may determine the U DC voltage changes to be in a range of 600-750 V with a 5 V step. c. In the next step, the designer determines what type of grid filter should be analyzed during the calculations (LCL, LCL + Trap, LLCL) [16], and it is possible to simultaneously analyze all the included types of filters, or only the selected ones. d. The last variables specified by the designer are the damping characteristics of the grid filter, expressed by coefficients described above.…”

“…The methodology of determining the general system parameters is described in detail in [16][17][18], and the operation of the procedure is shown in Fig. 4.…”