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Electricity, Volume 5, Issue 2 (June 2024) – 2 articles

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16 pages, 1160 KiB  
Article
Single-Stage LLC Resonant Converter for Induction Heating System with Improved Power Quality
by Anand Kumar, Anik Goswami, Pradip Kumar Sadhu and Jerzy R. Szymanski
Electricity 2024, 5(2), 211-226; https://doi.org/10.3390/electricity5020011 (registering DOI) - 26 Apr 2024
Viewed by 52
Abstract
This paper proposes a single-stage direct AC to high-frequency (HF) AC resonant converter based on LLC configuration for induction heating (IH) systems or HF applications. Unlike conventional converters for IH systems, the proposed topology converts the utility frequency to HF AC in a [...] Read more.
This paper proposes a single-stage direct AC to high-frequency (HF) AC resonant converter based on LLC configuration for induction heating (IH) systems or HF applications. Unlike conventional converters for IH systems, the proposed topology converts the utility frequency to HF AC in a single stage without using a DC link inductor and capacitors and takes the advantages of LLC configuration. Additionally, it improves the power factor to 0.9–1, lowers the THD (3.2% experimentally), and protects against the high-frequency components. An embedded control scheme was designed to keep the HF current oscillating at a resonant frequency, ensuring zero-voltage switching. The operating principle of the proposed topology was investigated using mathematical equations and equivalent circuits. Finally, it was verified using computer simulation, and an experimental prototype of 1.1 kW was developed to demonstrate the proposed topology’s uniqueness. Full article
(This article belongs to the Topic Power Converters)
37 pages, 25724 KiB  
Article
Development of a New Modelling Concept for Power Flow Calculations across Voltage Levels
by Tobias Riedlinger, Patrick Wintzek and Markus Zdrallek
Electricity 2024, 5(2), 174-210; https://doi.org/10.3390/electricity5020010 - 01 Apr 2024
Viewed by 456
Abstract
In the context of the energy transition, the share of new loads such as charging infrastructure for electromobility and electric heat pumps as well as feed-ins such as photovoltaic systems will steadily increase. This results in an increased degree of complexity for strategic [...] Read more.
In the context of the energy transition, the share of new loads such as charging infrastructure for electromobility and electric heat pumps as well as feed-ins such as photovoltaic systems will steadily increase. This results in an increased degree of complexity for strategic network planning. In particular, the power flow analyses for the dimensioning of transformers and lines per network level currently still require different methods for the correct dimensioning of these equipment. They need to be carried out in separate data sets. For the dimensioning of the equipment simultaneity factors are predominantly used for realistic load assumptions in strategic network planning. These simultaneity factors and resulting load assumptions are determined from the planning perspective of the transformers and from the planning perspective of the lines per network level to be able to dimension the corresponding equipment. This results in different power flow results for the analysis and evaluation of different network levels in particular. This contribution presents a new concept for network modelling in which the simultaneity of the different planning perspectives of the different network levels results from a single power flow calculation in a coherent data set. Full article
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