Wyniki wyszukiwania - BazTech

1

Development of simulation model of single-phase circuit lock in the DIgSILENT PowerFactory program

Pazyi Volodymyr, Miroshnyk Oleksandr, Shchur Taras, Halko Serhii, Nikolov Mitko, Idzikowski Adam

System Safety : Human - Technical Facility - Environment

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2023

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Vol. 5, iss. 1

350--358

EN

The most common types of damage in distribution networks with a voltage of 6-35 kV have been analyzed. It is shown that the majority of them are single-phase circuits, which can cause overvoltages at the point of damage and negatively affect electrical equipment, which can lead to a decrease in economic indicators. The methods of increasing the reliability of distribution networks with a voltage of 6-35 kV have been analyzed. The main attention is focused on the method of increasing reliability due to grounding of the neutral through an arc reactor, the main advantage of which in operation is the continuation of single-phase ground fault operation without disconnection of consumers. A simulation model of the distribution network in single-phase ground fault mode was developed and its main parameters were calculated. The DiGSILENT PowerFactory software complex is used as a simulation environment. A concrete example of parameter calculation when using the proposed simulation model in the DiGSILENT PowerFactory program, which contains 5 overhead and 5 cable power transmission lines with a voltage of 35 kV with a length of 10 to 100 kilometers. The use of this model will make it possible to study transient processes in the mode of single-phase grounding, to prevent emergency situations in distribution networks. The goal of the work ist development of the simulation model of the distribution network in the mode of single-phase circuit to land and the calculation of its basic parameters.

2

Impact of uncoordinated electric vehicle charging on the distribution grid

Farkas Csaba

Journal of Power Technologies

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2020

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Vol. 100, nr 1

85--91

EN

Charging electric vehicles (EVs) represents an extra and increasing load for the power system. And the higher the charging power is, the more likely it is that serious problems will arise. In addition to home charging, in Hungary - the area of interest in this paper - Level 2 chargers in the streets are currently installed with a maximum charging power of 22 kW. Since the local market share of EVs is low at present and expected to remain relatively low in the years to come, it is essential to see where the limits of the low-voltage distribution grid are in terms of taking the extra EV charging load. This paper presents extensive simulation results taking various EV charging characteristics, arrival statistics, household load variation, and other assumptions into consideration to determine how EV charging will aﬀect the low voltage grid. The stochastic simulations were conducted in DIgSILENT Power Factory augmented with a Python code. Simulation results indicate that an already moderately loaded grid is capable of accommodating EVs at a penetration level of approximately 20%, which can be considered a high value.

3

Universal DLL based components for simulations of multiphysical electro-thermal systems

Chmielewski T., Mars P., Miśkiewicz M., Błaszczyk P.

Przegląd Elektrotechniczny

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2017

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R. 93, nr 9

78--82

EN

This paper presents the procedures for universal models preparation of components and devices that can be used in various simulation software environments that can be used for electro-thermal systems analysis. Such approach is applicable for multiphysical analyses in areas such as electrical engineering, electronics and physics. The proposed method that involves generation of DLL libraries is explained based on multiphysical model comprising electric and thermal subsystems. The paper highlights a complementary benefit of models black-boxing that may play an important role for know-how protection. The analyses performed herein revealed that proposed universal models are able to produce credible quantitative results in case of all considered software environments (PSCAD, Matlab, DIgSILENT), however with significant differences in the recorded computation time.

PL

Niniejszy artykuł przestawia metodę przygotowania uniwersalnych modeli komponentów, możliwych do użycia w różnych środowiskach symulacyjnych służących do analiz multifizyczyny w dziedzinach takich jak elektrotechnika, elektronika i fizyka. Zaproponowana metodyka uwzględniająca generację bibliotek DLL została przedstawiona w oparciu o multifizyczny model składający się z części termicznej i elektrycznej. Przeprowadzona analiza wykazała dużą zbieżność wyników pomiędzy rozpatrywanymi programami symulacyjnymi (PSCAD, Matlab, DIgSILENT), jednakże z zauważalnymi różnicami w długości trwania obliczeń.

4

Study on P-V Curve and V-Q Curve of an Unbalanced Three- Phase System with Different Static Loads

Ramasamy A. K., Verayiah R., Abidin I. Z., Gunalan S., Perumal P.

Przegląd Elektrotechniczny

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2016

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R. 92, nr 1

159--165

EN

P-V curve and V-Q curve (often term as Q-V curve) are widely used for planning and operation studies. The P-V curve and V-Q curve of an unbalanced three-phase system, unlike the balanced three-phase system, may not have similar loading margin (LM) and reactive power margin (RPM) on each phase. Therefore, DIgSILENT Programming Language (DPL) has been used to study the maximum loading point (MLP), critical point (CP), and also minimum reactive power point (MRPP) on each phase of an unbalanced three-phase system with different static loads. The tracing direction of P-V curve of each phase and the LM and RPM of each phase obtained from the P-V curve and V-Q curve for different static loads are also discussed. On top of that, continuation power flow (CPF) has become a common method to study the MLP. Hence, a simple 2-bus balanced three-phase system is used to validate the result obtained from the DIgSILENT with CPF method.

PL

Krzywe P-V I V-Q w systemie trójfazowym niezrównoważonym mogą nie mieć tego samego marginesu obciążenia LM i marginesu mocy biernej RPM w każdej z faz. Zastosowano język programowania DIgSILENT do określenia maksymalnego punktu obciążenia MLP, punktu krytycznego CP i punktu minimalnej mocy biernej MRPP.