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Authors = Gurhan Ertasgin ORCID = 0000-0002-9264-5353

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25 pages, 6459 KiB  
Article
Development and Application of Comprehensive Simulation Models for Current-Source Inverter Modulators
by Gurhan Ertasgin and Erol Nikocevic
Appl. Sci. 2025, 15(11), 6148; https://doi.org/10.3390/app15116148 - 29 May 2025
Viewed by 542
Abstract
This paper provides an overview of existing theories on various modulation strategies for current-source inverters (CSI), particularly focusing on space vector modulation (SVM). The emphasis is on the development of detailed simulation models that improve understanding and allow practical application. Three important modulators [...] Read more.
This paper provides an overview of existing theories on various modulation strategies for current-source inverters (CSI), particularly focusing on space vector modulation (SVM). The emphasis is on the development of detailed simulation models that improve understanding and allow practical application. Three important modulators are analyzed: voltage-source inverter (VSI)-derived CSI SVM modulator, direct CSI SVM modulator, and direct duty ratio CSI PWM modulator (DDPWM). These models are important for researchers and practicing engineers as they allow simulation, modification and better understanding of CSIs. This paper begins with a theoretical overview of the functionality of CSIs and presents the modulation techniques needed to develop simulation models. These modulation techniques use modular components to create complete simulation models. Application examples are provided to use the correct/valid parameters such that the operation/waveforms can be compared with the theory. Integrating established mathematical models with effective simulation tools enhances the understanding and application of CSI modulators. This method not only makes it easier to employ these CSIs instead of conventional inverter systems, but it also increases the possibility of power electronics advancements by creating better and more reliable systems. Full article
(This article belongs to the Special Issue Current Research and Future Trends in Power Electronics Applications)
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24 pages, 1458 KiB  
Article
Analysis and Optimization of Output Low-Pass Filter for Current-Source Single-Phase Grid-Connected PV Inverters
by Gurhan Ertasgin and David M. Whaley
Appl. Sci. 2024, 14(22), 10131; https://doi.org/10.3390/app142210131 - 5 Nov 2024
Cited by 2 | Viewed by 2340
Abstract
In this study, the design of output low-pass capacitive–inductive (CL) filters is analyzed and optimized for current-source single-phase grid-connected photovoltaic (PV) inverters. Four different CL filter configurations with varying damping resistor placements are examined, evaluating performance concerning the output current’s total harmonic distortion [...] Read more.
In this study, the design of output low-pass capacitive–inductive (CL) filters is analyzed and optimized for current-source single-phase grid-connected photovoltaic (PV) inverters. Four different CL filter configurations with varying damping resistor placements are examined, evaluating performance concerning the output current’s total harmonic distortion (THD), the power factor (PF), and power losses. High-frequency harmonics are effectively attenuated by a second-order CL filter with the damping resistor placed parallel to the filter inductor. In addition, this filter type achieves the best performance by minimizing power loss. A systematic design methodology using filter normalization techniques allows to determine the optimum filter parameters based on the specified cut-off frequency (500 Hz), power loss (5% of rated power), and target THD (<5%). The analysis, simulations, and experiments show that under various operating conditions, this approach meets the grid connection standards (current THD < 5%, power factor between 0.8 leading and 0.95 lagging) while improving efficiency. Full article
(This article belongs to the Special Issue Advancements in Power Electronics and Control Technologies)
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16 pages, 1579 KiB  
Article
Design of a Half-Bridge Current-Source Inverter Topology for Avionic Systems
by Eralp Sener and Gurhan Ertasgin
Aerospace 2022, 9(7), 354; https://doi.org/10.3390/aerospace9070354 - 1 Jul 2022
Cited by 2 | Viewed by 4346
Abstract
This paper analyses a new half-bridge current–source inverter for avionic systems. In the circuit, two 28 V batteries are used as inputs. These voltage sources are connected to inductors which create a constant current source. Then only two high-frequency switches are used to [...] Read more.
This paper analyses a new half-bridge current–source inverter for avionic systems. In the circuit, two 28 V batteries are used as inputs. These voltage sources are connected to inductors which create a constant current source. Then only two high-frequency switches are used to waveshape the positive and negative half-cycles. The SCR-based half-bridge allows positive and negative current flow properly. The inverter output uses a CL filter to remove PWM components and to obtain 400 Hz sinewave output. Simulation and HIL experiment results are provided with feedback control to prove the concept of the proposed topology. The study shows that the new current–source topology provides promising results while complying with aviation standards. Full article
(This article belongs to the Special Issue New Trends in Aviation Development 2021-2022)
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19 pages, 1711 KiB  
Article
Analysis of DC Link Energy Storage for Single-Phase Grid-Connected PV Inverters
by Gurhan Ertasgin, David M. Whaley, Nesimi Ertugrul and Wen L. Soong
Electronics 2019, 8(6), 601; https://doi.org/10.3390/electronics8060601 - 29 May 2019
Cited by 14 | Viewed by 5768
Abstract
Single-phase grid-connected photovoltaic (PV) inverters (GCI) are commonly used to feed power back to the utility. However, the inverter output power fluctuates at 100 Hz, which can be seen by the PV panel, and this reduces the PV output power. It is important [...] Read more.
Single-phase grid-connected photovoltaic (PV) inverters (GCI) are commonly used to feed power back to the utility. However, the inverter output power fluctuates at 100 Hz, which can be seen by the PV panel, and this reduces the PV output power. It is important to determine and analyze the correlation between the array voltage and current ripple and the average output power reduction of PV array. Therefore, this paper investigates the relationships between the oscillations due to single-phase switching and the DC link energy storage for PV GCIs. The balanced ripple definition is introduced and compared with the more common centered ripple definition. Some examples are provided that demonstrate the importance of these results, in the inverter design industry. The analysis presented here incorporates inductor trade-offs, which are verified with experimental results. Full article
(This article belongs to the Special Issue Grid Connected Photovoltaic Systems)
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