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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

Przepięcia w sieciach z izolowanym punktem neutralnym

Sayenko Y., Popov A., Pawełek R.

Przegląd Elektrotechniczny

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2015

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R. 91, nr 11

86-89

PL

W artykule omówiono problemy związane z przepięciami ferrorezonansowymi oraz łukowymi przy jednofazowych zwarciach doziemnych w sieciach z izolowanym punktem neutralnym. Zaprezentowano model obliczeniowy i wyniki badań symulacyjnych mające na celu określenie zakresu parametrów sieci, przy jakich występują warunki stabilnego ferrorezonansu. Przedstawiono wyniki badań dotyczące przepięć ziemnozwarciowych. W obu przypadkach założono stochastyczny charakter zjawisk. Wykazano, że krotność przepięcia ziemnozwarciowego jest proporcjonalna do napięcia przebicia izolacji.

EN

The paper deals with problems regarding ferroresonance overvoltages and transient overvoltages due to single-phase faults in isolated networks. The calculation model has been presented as well as simulation results aiming at the determination of network parameters for stable ferroresonance conditions. Results are presented concerning transient overvoltages under ground faults. The stochastic character of phenomena has been taken into account. It has been shown that the multiplicity of overvoltage fault is proportional to the voltage insulation breakdown.

3

A Novel Arc Suppression Coil

Xu B., Zhang J., Cai X.

Przegląd Elektrotechniczny

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2013

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R. 89, nr 3a

213--217

EN

The arc suppression coil (ASC) is one of the most important devices in distribution networks to obtain the optimal power supply quality. Though there exits many types of ASC, some problems have been still not solved. In order to develop an ASC with rapid and continuous tuning and limited harmonics, this paper proposes a novel type of ASC, which is based on a single phase matrix converter. Due to pulse width modulation (PWM) control, compensating currents can be adjusted in a wide range and the order of harmonics is so high to be filtered easily. Finally, by using PSCAD/EMTDC, simulations are given to illustrate the feasibility and validity of this novel ASC.

PL

W artykule zaproponowano nowy typ dławika gaszącego ASC, bazujący na jednofazowym przekształtniku matrycowym. Dzięki modulacji PWM, możliwe jest generowanie prądów kompensujących o szerokim zakresie, a co za tym idzie skuteczna eliminacja harmonicznych. Wykonano badania symulacyjne w programie PSCAD/EMTDC, weryfikujące skuteczność działania rozwiązania.