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Topology analysis and parameter design of three-level multi-input DC/DC converter based on multi-source access

Tian Jingjing, Qu Jiaoping, Zhao Feng, Chen Xiaoqiang, Wang Ying, Gan Yang

Archives of Electrical Engineering

2023

Vol. 72, nr 1

59--80

A three-level multi-input DC/DC converter is proposed to solve the problems of complex interface circuit structure and high economic cost for multi-source access to the joint power supply distribution system. In this structure, multiple dc sources are integrated into a three-level DC/DC converter. In comparison with the two-stage counterpart, two active switches and boost diodes are eliminated, while two blocking diodes are added to block the reverse current from the dc-link capacitors. In addition, when the input inductors work in the discontinuous conduction mode, power sharing among different input sources can be achieved by properly selecting the inductance value. The working principle of the converter is analyzed by introducing nine working modes in detail and deriving the steady-state relationship expressions. The parameter range of the element is determined and the design process of a group of dynamic parameter values is shown. Finally, the power electronics real-time simulation platform is built based on StarSim HIL and the corresponding experimental waveforms are given to verify the topology and analysis.

Three-Level Adapted Output Space Mapping Technique for Two-Objective Optimization

Gong J., Ben-Ayed R., Gillon F., Brisset S., Brochet P.

Przegląd Elektrotechniczny

2012

R. 88, nr 7b

65-68

Multi-objective optimization with 3D finite element model is a complex and time consuming process. Output space-mapping techniques allow having an affordable computation cost with a minimum number of computationally expensive FEM evaluations. In this paper, a three-level adapted output space-mapping technique is proposed to assist two-objective optimization problems. Three models having different granularity and describing the same device are used jointly in the optimization process. The results for the safety isolating transformer show that the proposed algorithm allows saving a substantial amount of computation time compared to the classical two-level output space-mapping technique.

Przedmiotem artykułu jest dwukryterialna optymalizacja, trójpoziomowa, wykorzystująca metody odwzorowania zewnętrznej przestrzeni. Przypadek techniczny (transformator bezpieczeństwa) przeanalizowano trzema metodami, różniącymi się od siebie ziarnistością. Wyniki analizy wskazały na istotną redukcję czasu obliczeń w porównaniu do podejścia klasycznego dwupoziomowego.