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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.

Design and Control of Multi-terminal VSC-HVDC for Large Offshore Wind Farms

Shi G., Cai X., Chen Z.

Przegląd Elektrotechniczny

2012

R. 88, nr 12a

264-268

In this paper, the parameters design of VSC-HVDC terminal is proposed. A four-terminal VSC-HVDC system is configured as the simplified study system. The control schemes of coordinated control and master-slave control for MTDC system power delivery are investigated and their shortages are introduced. The control effect and power system stability is evaluated by three dynamic simulation cases based on PSCAD/EMTDC, which correspond to wind power fluctuation.

W artykule przedstawiono dobór parametrów układu VSC-HVDC. Badania oparto na układzie cztero-stronnym, z wykorzystaniem algorytmu sterowania mocą wyjściową systemu wielostronnego. Wykonano symulacje w PSCAD/EMTDC stanów dynamicznych, odzwierciedlające zmienność wiatru.