Power Electronics

Dokić, Branko; Blanuša, Branko

doi:10.1007/978-3-319-09402-1

Cited by 44 publications

(12 citation statements)

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“…Except for this model, the linearized model is often used as a sufficiently accurate approximation. A linearized model of losses in a power electronic converter can be represented as follows [28]…”

Section: Soft Open Point Losses Estimationmentioning

confidence: 99%

An Extended Control Strategy for Weakly Meshed Distribution Networks With Soft Open Points and Distributed Generation

Ivic¹,

Stefanov

2021

IEEE Access

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As part of the smart grid concept, different strategies specialized for power flow control in distribution networks have been developed. One of the possible solutions to optimize the utilization of existing capacities and increase distributed generation penetration is the implementation of Soft Open Points. Soft Open Points are modular devices based on power electronic converters that enable closing loops in the network without negative consequences regarding fault current propagation. Introducing the concept of soft open points in the distribution network enables power flow control in a particular part of the network and voltage control in the soft open point connecting nodes. The control strategy proposed in this paper addresses the main obstacle for appropriate exploitation of soft open points, defining reference values for control variables in the case of large-scale distribution systems. Furthermore, the proposed strategy also deals with data unavailability problems, that is, soft open point control under communication interruption. The proposed control algorithm incorporates centralized optimal power flow calculations and an estimation algorithm based on a multivariate polynomial regression. The optimal power flow is used to calculate the control variables in normal operation modes. The procedure based on multivariate polynomial regression was used to estimate the reference values of the control variables when the optimal power flow results were unavailable. This feature makes the proposed algorithm applicable to communication interruptions when only limited data capture is available. The algorithm proposed in this study was implemented and tested on a test network considering different scenarios. Conclusions and simulation results make this algorithm applicable to an actual soft open point controller.

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Section: Soft Open Point Losses Estimationmentioning

confidence: 99%

An Extended Control Strategy for Weakly Meshed Distribution Networks With Soft Open Points and Distributed Generation

Ivic¹,

Stefanov

2021

IEEE Access

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“…To carry out an analysis of current source inverters, the method of the first harmonic analysis (FHA) is usually applied [5][6][7][8][9][10] and in applications related to electrotechnology, where the loads are part of resonant circuits with a sufficiently good quality factor, a satisfactory accuracy is achieved, compared to the exact analysis methods that account for the influence of all harmonics. In this aspect, the existing methodologies for the design of current source inverters based on the analysis of the first harmonic method give very good results and use relatively simple calculation procedures.…”

Section: Introductionmentioning

confidence: 99%

“…Of course, when working with other loads, where the remaining harmonics cannot be ignored (such as drives, applications in the energy sector, etc. ), the use of such an analysis is unacceptable also due to the unsatisfactory accuracy of the results [3,8,10].…”

Section: Introductionmentioning

confidence: 99%

A Unified Approach to the Analysis of DC/AC Converters, Based on the Study of Electromagnetic Processes in a Series RLC Circuit

Hinov

2023

Electronics

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This paper presents a unified approach to the analysis of DC/AC converters based on an equivalent representation of their AC circuit as a series RLC circuit. The resonant DC/AC converter with reverse diodes was chosen as the basis of the examination, and the obtained ratios for this device were used to derive the main ratios describing the operation of the other types of DC/AC converters—voltage source inverters (VSI) and current source inverters (CSI). Based on the commonality of electromagnetic processes in power circuits, the expressions for the current through the inductance and the voltage of the capacitor are found in a compact form with their initial phases. The base ratios found through the analysis are normalized to the control frequency, thereby summarizing all possible operating modes. In this way, electromagnetic processes in a whole class of power electronic devices are described from general positions, which is convenient from a methodical point of view with a view to improving power electronics education. The proposed analysis approach is also applicable to three-phase DC/AC inverters, taking into account the specifics related to the presence of three phases and, accordingly, their mutual influence in the formation of the output currents and voltages. On the other hand, the basic ratios determined through the application of the unified analysis approach are also useful with a view to creating engineering design methodologies, in which the values of all circuit elements are determined with comparatively simplified calculation procedures.

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“…Nowadays, inverters are widely used in a variety of industrial applications such as variable speed drive applications, emergency power supplies, renewable energies, Solar photovoltaic and wind turbines systems, ... etc.. Their wide range of power and flexibility of use in terms of advances in power electronics have contributed to their success. This evolution has made it possible to reduce the cost and the size of the static converters, and to increase their reliability, as well as to exploit more efficient control techniques [1].…”

Section: Introductionmentioning

confidence: 99%

A Combined RMS-MEAN Value Approach for an Inverter Open-Circuit Fault Detection

Khelif

Bendiabdellah

Chérif

2019

Period. Polytech. Elec. Eng. Comp. Sci.

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Currently, with the power electronics evolution, a major research axis is oriented towards the diagnosis of converters supplying induction machines. Indeed, a converter such as the inverter is susceptible to have structural failures such as faulty leg and/or opencircuit IGBT faults. In this paper, the detection of the faulty leg and the localization of the open-circuit switch of an inverter are investigated. The fault detection technique used in this work is based essentially upon the monitoring of the root mean square (RMS) value and the calculation of the mean value of the three-phase currents. In the first part of the paper work, the faulty leg is detected by monitoring the RMS value of the three-phase currents and comparing them to the nominal value of the phase current. The second part, the open-circuit IGBT fault is localized simply by knowing the polarity of the calculated mean value current of the faulty phase.The work is first accomplished using simulation work and then the obtained simulation results are validated by experimental work conducted in our LDEE laboratory to illustrate the effectiveness, simplicity and rapidity of the proposed technique.

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Power Electronics

Cited by 44 publications

References 0 publications

An Extended Control Strategy for Weakly Meshed Distribution Networks With Soft Open Points and Distributed Generation

An Extended Control Strategy for Weakly Meshed Distribution Networks With Soft Open Points and Distributed Generation

A Unified Approach to the Analysis of DC/AC Converters, Based on the Study of Electromagnetic Processes in a Series RLC Circuit

A Combined RMS-MEAN Value Approach for an Inverter Open-Circuit Fault Detection

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