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1. Passivity based Stability Assessment for Four types of Droops for DC Microgrids

Author

Anees, Muhammad, Qi, Lisa, Schweizer, Mario, and Lukic, Srdjan

Subjects
Electrical Engineering and Systems Science - Systems and Control
Abstract

DC microgrids are getting more and more applications due to simple converters, only voltage control and higher efficiencies compared to conventional AC grids. Droop control is a well know decentralized control strategy for power sharing among converter interfaced sources and loads in a DC microgrid. This work compares the stability assessment and control of four types of droops for boost converters using the concept of passivity. EN standard 50388-2 for railway systems provides a reference to ensure system stability in perspectives of converters and system integration. Low pass filter (LPF) in the feedback of the droop control is used to ensure converter passivity. Bus impedance is derived to ensure system passivity with less conservativeness. Analytical approach for design of passive controller for all four types of droops is verified through time domain simulations of a single boost converter based microgrid feeding a Constant Power Load (CPL).

Published
2024

3. Grid-Forming Vector Current Control

Author

Schweizer, Mario, primary, Almer, Stefan, additional, Pettersson, Sami, additional, Merkert, Arvid, additional, Bergemann, Vivien, additional, and Harnefors, Lennart, additional

Published
2022
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5. Generic PLL-Based Grid-Forming Control.

Author

Harnefors, Lennart, Schweizer, Mario, Kukkola, Jarno, Routimo, Mikko, Hinkkanen, Marko, and Wang, Xiongfei

Subjects
*PHASE-locked loops, *VOLTAGE control
Abstract

In grid-forming control, the swing equation of a synchronous machine is emulated by a power controller. Thereby, frequency droop, power-oscillation damping, and/or virtual inertia can be obtained. In this letter, it is shown that a phase-locked loop—which is normally grid following—can be designed so as to, in turn, emulate a generic power controller, thus, becoming grid-forming. [ABSTRACT FROM AUTHOR]

Published
2022
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6. SiC Versus Si-Evaluation of Potentials for Performance Improvement of Inverter and DC-DC Converter Systems by SiC Power Semiconductors

Author

Biela, Jürgen, Schweizer, Mario, Waffler, Stefan, and Kolar, Johann W.

Subjects
SiC power semiconductor, AC-DC power converters, DC-DC power converters, Switches
Abstract

Switching devices based on wide bandgap materials such as silicon carbide (SiC) offer a significant performance improvement on the switch level (specific on resistance, etc.) compared with Si devices. Well-known examples are SiC diodes employed, for example, in inverter drives with high switching frequencies. In this paper, the impact on the system-level performance, i.e., efficiency, power density, etc., of industrial inverter drives and of dc-dc converter resulting from the new SiC devices is evaluated based on analytical optimization procedures and prototype systems. There, normally on JFETs by SiCED and normally off JFETs by SemiSouth are considered., IEEE Transactions on Industrial Electronics, 58 (7), ISSN:0278-0046, ISSN:1557-9948

Published
2011

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