Dariusz Zieliński
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View article: Sustainable Air-Conditioning Systems Based on Cold Storage with Comparative Analysis of Efficiency and Costs
Sustainable Air-Conditioning Systems Based on Cold Storage with Comparative Analysis of Efficiency and Costs Open
The concept behind this undertaking was to create environmentally friendly and sustainable air-conditioning systems supported by energy storage units, as well as to conduct comparative calculations of investment and operational costs to as…
View article: Sensorless Compensation of DC-Link Current Pulsations in Energy Storage Systems
Sensorless Compensation of DC-Link Current Pulsations in Energy Storage Systems Open
This study addresses the problem of DC-link current pulsations in four-wire AC/DC converters with energy storage operating under unbalanced load conditions. A sensorless compensation algorithm based on AC-side voltage and current measureme…
View article: The Effect of Cable Aging on Surge Arresters Designed by Genetic Algorithm
The Effect of Cable Aging on Surge Arresters Designed by Genetic Algorithm Open
The degradation of communication cable insulators reduces the availability of the train control system and is caused by the degrading of data transmission line parameters. Due to extremely varying environmental conditions in the railway in…
View article: Sensorless Current Pulsation Compensation in a Hybrid Energy Storage
Sensorless Current Pulsation Compensation in a Hybrid Energy Storage Open
This paper presents a dual active bridge DC/DC converter used as an AC current compensator in a hybrid energy storage application. The AC current in the DC link appears when a three-phase, four-wire inverter operates with unbalanced output…
View article: Phase-Independent Reactive Power Compensation Based on Four-Wire Power Converter in the Presence of Angular Asymmetry between Voltage Vectors
Phase-Independent Reactive Power Compensation Based on Four-Wire Power Converter in the Presence of Angular Asymmetry between Voltage Vectors Open
The paper presents the reactive power compensation method that allows for reducing the active power flow even in the presence of angular asymmetry between voltage vectors of the utility grid. Reactive power compensation ensures the reducti…
View article: Remote Synchronization of the Microgrid to the Utility Grid Without Access to Point of Common Coupling in the Presence of Disturbances
Remote Synchronization of the Microgrid to the Utility Grid Without Access to Point of Common Coupling in the Presence of Disturbances Open
The article presents the method of remote micro-grid synchronization with the utility grid in the presence of voltage disturbances. The proposed algorithm and control devices synchronize different power systems on the basis of the instanta…
View article: A Nine-Level Inverter With Single DC-Link and Low-Voltage Capacitors as Stacked Voltage Sources With Capacitor Voltage Control Irrespective of Load Power Factor
A Nine-Level Inverter With Single DC-Link and Low-Voltage Capacitors as Stacked Voltage Sources With Capacitor Voltage Control Irrespective of Load Power Factor Open
This article proposes a multilevel inverter topology with single dc-link and series-connected capacitors as stacked voltage sources for multilevel voltage generation. The voltage deviation of a dc-link capacitor will occur whenever a phase…
View article: A Ten-Level Inverter Fed Drive Scheme with Extended Linear Modulation Range
A Ten-Level Inverter Fed Drive Scheme with Extended Linear Modulation Range Open
In this work, a ten-level inverter scheme is presented to extend the linear modulation range (LMR) by using a unique space vector pulsewidth modulation (SVPWM) technique, such that no lower order harmonics (such as 5th, 7th, 11th, and 13th…
View article: Frequency Estimation for Grid-Tied Inverters Using Resonant Frequency Estimator
Frequency Estimation for Grid-Tied Inverters Using Resonant Frequency Estimator Open
This paper introduces a new strategy of frequency estimation for grid-tied and stand-alone mode AC/DC power converters. Frequency stabilization is required, especially when operating in stand-alone mode with a Droop Control strategy, or in…
View article: Dual Active Bridge as a DC Link Current Pulsation Compensator in Energy Storage Applications
Dual Active Bridge as a DC Link Current Pulsation Compensator in Energy Storage Applications Open
This paper presents a system for compensating DC link current pulsation in four-wire inverters with energy storage operating under unbalanced load conditions. This phenomenon occurs when an inverter with an independent power control in eac…
View article: Ensuring the Continuity of Power Supply to the On-Board Auxiliary Devices of the Trolleybus through the Recuperation of Kinetic Energy
Ensuring the Continuity of Power Supply to the On-Board Auxiliary Devices of the Trolleybus through the Recuperation of Kinetic Energy Open
When a trolleybus travels through insulated sections of the overhead contact line, it experiences momentary power interruptions, which adversely affect the vehicle’s on-board auxiliary subassemblies. To reduce these negative effects, one c…
View article: Modified repetitive control based on comb filters for harmonics control in grid-connected applications
Modified repetitive control based on comb filters for harmonics control in grid-connected applications Open
Power quality plays an important role in the operation of grid-connected inverters. The injected current should have a minimum harmonic content in order to comply with the local grid codes. This can be challenging due to the fact that the …
View article: Attenuation of DC-Link Pulsation of a Four-Wire Inverter during Phase Unbalanced Current Operation
Attenuation of DC-Link Pulsation of a Four-Wire Inverter during Phase Unbalanced Current Operation Open
This paper proposes a control algorithm for a hybrid power electronic AC/DC converter for prosumer applications operating under deep phase current asymmetry. The proposed system allows independent control of active and reactive power for e…
View article: Control of a Four-wire Hybrid Prosumer Converter for Balancing Utility Grids
Control of a Four-wire Hybrid Prosumer Converter for Balancing Utility Grids Open
The paper presents the project of the power electronic AC/DC converter operating under a multiresonant control algorithm for prosumer applications. This design allows independent control of active and reactive power for any or each phase. …
View article: A Multilevel 30-Sided Space Vector Structure With Congruent Triangles and Timing Calculation Using Only Sampled Reference Voltages
A Multilevel 30-Sided Space Vector Structure With Congruent Triangles and Timing Calculation Using Only Sampled Reference Voltages Open
In this article, a multilevel inverter scheme to generate a 30-sided space vector structure (SVS) with congruent triangles is proposed. The 30-sided SVS eliminates all the lower order harmonics till 25th order from motor phase voltage thro…
View article: An evaluation of the accuracy of inverter sync angle during the grid's disturbances
An evaluation of the accuracy of inverter sync angle during the grid's disturbances Open
The grid-tied inverter synchronizes with the network on the basis of the instantaneous voltage phase angle. This angle is computed by the so-called synchronization algorithms. During grid disturbances, it is estimated with a certain accura…
View article: FGC3.2: A New Generation of Embedded Controls Computer for Power Converters at CERN
FGC3.2: A New Generation of Embedded Controls Computer for Power Converters at CERN Open
Modern power converters (power supplies) at CERN are controlled by devices known as Function Generator/Controllers (FGCs), which are embedded computer systems providing function generation, current and field regulation, and state control. …
View article: Remote Micro-Grid Synchronization Without Measurements at the Point of Common Coupling
Remote Micro-Grid Synchronization Without Measurements at the Point of Common Coupling Open
This article presents a new strategy of active synchronization of an island micro-grid and the utility grid (UG) without measurements at the point of common coupling (PCC). This strategy is based on the assistance of Ethernet communication…
View article: SIMULATION AND COMPARISON OF SELECTED FAST CHARGERTOPOLOGIES
SIMULATION AND COMPARISON OF SELECTED FAST CHARGERTOPOLOGIES Open
The article reviews the role of fast chargers in swiftly developing area of electrical energy storage devices. Energy efficient techniques implemented in fast chargers are shown, world standard requirements are mentioned. The models of the…
View article: COLD STORAGE-SUPPORTED AIR CONDITIONING SYSTEM IN URBAN TRANSPORT VEHICLES
COLD STORAGE-SUPPORTED AIR CONDITIONING SYSTEM IN URBAN TRANSPORT VEHICLES Open
A bottleneck for the development of public transport vehicles is their electricity supply. Electric buses are almost exclusively equipped with electrochemical batteries, while nearly 40% of the energy is used in the processes of air condit…