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1

Three-phase full-wave diode rectifier with DC voltage stabilization

Brinovar Iztok, Božičnik Benjamin, Srpčič Gregor, Chowdhury Amor, Seme Sebastijan, Štumberger Bojan, Hadžiselimović Miralem

Przegląd Elektrotechniczny

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2023

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R. 99, nr 7

220--222

EN

This paper deals with the design and fabrication of a three-phase full-wave diode rectifier, which is based on an industrial modular bridge circuit consisting of six semiconductor diodes. Special attention is given to the design of DC voltage stabilization with film capacitors, which have extremely low series resistances and inductances. Thus, within the framework of this paper, a stabilized rectifier with a nominal power of 270 kW and a maximum current of 300 A was made. Various tests have been conducted to evaluate the rectifier's performance, affirming its practical applicability.

PL

Artykuł dotyczy zaprojektowania i wykonania trójfazowego pełnookresowego prostownika diodowego, który jest oparty na przemysłowym modułowym obwodzie mostkowym składającym się z sześciu diod półprzewodnikowych. Szczególną uwagę zwrócono na konstrukcję układu stabilizacji napięcia stałego z kondensatorami foliowymi, które mają wyjątkowo niskie rezystancje szeregowe i indukcyjności. W ramach pracy wykonano więc prostownik stabilizowany o mocy znamionowej 270 kW i maksymalnym natężeniu prądu 300 A. Przeprowadzono różne testy w celu oceny wydajności prostownika, potwierdzając jego praktyczną przydatność.

2

Analysis of electrical non-isolated load sharing systems operation with use of the auctioneering diodes

Kozak Maciej

Poznan University of Technology Academic Journals. Electrical Engineering

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2019

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No. 98

77--88

EN

The paper presents the background and results of numerical simulation and experimental research of a system using auctioneering diodes used to distribute the power of direct current between two power converters operating in parallel. Non-isolated power distribution systems using blocking diodes are used in the ship's electrical power systems, however, they create problems related to control and the possibility of ground faults. Another issue occurring during the operation of this type of systems is the increased heat dissipation. Selected problems related to the operation of the above systems have been identified by means of simulation studies and experiments carried out in a 11 kVA laboratory system and the theoretical basis along with results are provided in the article.

3

Dynamiczne modele stałoprądowego łącza B2B do badań zakłóceń niesymetrycznych - studium przypadku dla LitPol Link

Halinka A., Rzepka P., Sowa P., Szablicki M.

Wiadomości Elektrotechniczne

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2018

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R. 86, nr 7

3--13

PL

Wysokonapięciowe układy przesyłowe prądu stałego znajdują coraz szersze zastosowanie w elektroenergetyce. Dotyczy to również Krajowego Systemu Elektroenergetycznego, w którym w ostatnim roku oddano do użytku łącze stałoprądowe typu Back-to-Back – LitPol Link. Wysokonapięciowe łącza stałoprądowe to nowe elementy sieciowe o specyficznych właściwościach, mogące cechować się dużymi różnicami działania w zależności od zastosowanej technologii realizacji łącza. Implikuje to potrzebę prowadzenia symulacyjnych badań porównawczych zachowania się tych łączy w stanach zakłóceniowych, szczególnie podczas zwarć niesymetrycznych zlokalizowanych w otoczeniu sieciowym łącza. W niniejszym artykule zamieszczono szczegółowy opis złożonych, wielowarstwowych modeli łącza LCC i VSC predestynowanych do badań elektromagnetycznych stanów przejściowych towarzyszących zakłóceniom niesymetrycznym. Jako studium przypadku wybrano łącze LitPol Link.

EN

High voltage direct current transmission systems are increasingly used in the power systems. This also applies to the National Power System, which last year was put into operation the DC link type Back-to-Back – LitPol Link. High voltage DC lines are new network elements with specific properties, whereby HVDCs can have large differences in performance depending on the technology used to implement the link. This implies the need for simulation comparative research of the behavior of these links in disturbance states, especially during asymmetric faults located in the network. This article contains a detailed description of complex, multilayer LCC and VSC link models predestined for electromagnetic transient investigations associated with asymmetric interference. As a case study, the LitPol Link was chosen.

4

Control strategies for the grid side converter in a wind generation system based on a fuzzy approach

Harrabi N., Kharrat M., Aitouche A., Souissi M.

International Journal of Applied Mathematics and Computer Science

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2018

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Vol. 28, no. 2

323--333

EN

Two techniques for the control of a grid side converter in a wind energy conversion system. The system is composed of a fixed pitch angle wind turbine followed by a permanent magnet synchronous generator and power electronic converters AC-DC-AC. The main interest is in how to control the inverter in order to ensure the stability of the DC link voltage. Two control methods based on the fuzzy approach are applied and compared. First, a direct Mamdani fuzzy logic controller is presented. Then, a T–S fuzzy controller is elaborated based on a T–S fuzzy model. The Lyapunov theorem and H-infinity performance are exploited for stability analysis. Besides, the feedback controller gains are determined using linear matrix inequality tools. Simulation results are derived in order to prove the robustness of the proposed control algorithms and to compare their performances.

5

DC link condition monitoring method for two-level AC/DC/AC converters

Lipnicki P., Lewandowski D.

Power Electronics and Drives

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2017

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Vol. 2 (37), No. 1

43--56

EN

Power electronics is one of the most important elements of today’s industry. Many of converters applications are being considered as critical for plant production process. Offering enhanced functionality in modern AC drives is a way to gain a competitive advantage in power converters market. One of the values to the customers comes from low cost condition monitoring of critical equipment and from optimized maintenance costs. DC bus is one of the elements of power converters. Although the designers pay a lot of attention when designing DC-link circuit, breakdowns and failures of the DC circuit components can still happen. Unfortunately this means that the whole converter must be shut down in emergency mode to be repaired. Nowadays, monitoring of the bus capacitor is becoming one of the desired features from customer side, as well as from the converter manufacturer. Proposed approach presents a method which assures the online evaluation of the equivalent series resistance (ESR) of a DC-link capacitor. The ESR increase trend is an important indicator of accelerated aging process or incoming failure of the capacitor. The important feature of the proposed condition monitoring method is that it does not require any additional sensors. For estimation purposes already installed sensors and other internal converter’s signals are used. Particularly the method employs the DC-link voltage measurement with the DC-link current reconstruction.

6

Control of squirrel-cage electric generators in a parallel intermediate DC circuit connection

Kozak M., Gordon R., Bejger A.

Zeszyty Naukowe Akademii Morskiej w Szczecinie

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2016

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nr 45 (117)

17--22

EN

The paper covers the theoretical background and tests of two asynchronous squirrel cage generators connected to voltage source inverters working in parallel. Inverters were connected in parallel by their intermediate direct current circuits by means of auctioneering diodes, and then to a DC power network. The real-time control algorithm of digital signal processor DSP and field-programmable gate array FPGA was used to achieve proper excitation of two different power machines, and to maintain high enough levels of direct current link voltage. Windings of both generators are fed by use of so-called machine side inverters. The asynchronous generator is a voltage source inverter controlled by a field-oriented control algorithm based on the current machine model. To prove robustness of the chosen algorithm, different types of load were applied while generators and inverters worked in parallel.