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The impact of renewable energy sources on the overload of high voltage lines – power flow tracking versus direct current method

Pijarski Paweł, Saigustia Candra, Kacejko Piotr, Bena Lubomir, Belowski Adrian

Archives of Electrical Engineering

2024

Vol. 73, nr 2

519--541

Studying the impact of renewable energy sources planned to be connected to the grid, requires the preparation of expert opinions. The task of this opinion is to verify that there are possibilities enabling the connection of the considered source to the network. Each opinion is required to take into account other facilities and those sources which were previously connected to the grid or connection agreement were signed with them. The need to take into account such a large number of sources contributes to potential thermal overloads of high-voltage lines. Sometimes these overloads are insignificant, but in certain situations it turns out that their occurrence may be a reason for refusing to sign connection agreements for new sources. According to network operators, their presence may constitute a threat to the operational security of the grid. The article presents the use of the method of tracking active power flows and the DC method of determining power flows to estimate the impact of these sources on thermal overloading of lines. Using of the IEEE-118 test network, selected nodes were analysed where connecting sources might significantly worsen overloads previously observed or would cause new overloads. The proposed approach will enable potential investors to make proper decisions regarding selection of source connection points. Combining the results obtained by both methods at the same time will allow for the indication of appropriate connection nodes for sources from the point of view of minimising the number of overloaded lines and prospective costs of their uprating.

Wybrane zagadnienia selektywności w instalacjach elektroenergetycznych niskiego napięcia

Klajn A.

Elektro Info

2016

nr 4

52--56

Selektywność w instalacjach elektroenergetycznych jest istotnym problemem. Artykuł przedstawia zagadnienie selektywności w instalacjach elektroenergetycznych niskiego napięcia, z powszechnie stosowanymi urządzeniami z zabezpieczeniem nadprądowym. Rozważane są podstawowe charakterystyki zabezpieczeń nadprądowych lub spodziewany prąd przeciążenia i prąd zwarciowy.

Selectivity in a electrical power installations is a fundamental problem. The article describes the issue of the selectivity in electrical power installations of low voltage, with commonly used devices of over-current protection. The basic characteristics of over-current and short-circuit current are taken into consideration.