Ocena vpliva baterijskega hranilnika električne energije na vrednost jakosti flikerja v elektroenergetskem omrežju

Aljančič, Domen (author), Herman, Leopold (mentor)

Baterijski hranilniki električne energije (BHEE) lahko svojo delovno moč spreminjajo hitro in v obe smeri (polnjenje in praznjenje), zato lahko vplivajo na napetostne razmere v priključni točki in s tem na kakovost napetosti. Namen naloge je oceniti vrednost jakosti flikerja, ki nastane zaradi hitrih sprememb delovne moči BHEE, ter primerjati poenostavljeno analitično oceno z rezultati simulacije. Uporabljen je poenostavljen model omrežja s togo mrežo 110 kV (1500 MVA), transformatorjem 110/20 kV, konstantnim odjemom in hranilnikom moči 5 MW, priključenim prek pretvornika (PCS) in transformatorja 20/0,69 kV. Fliker je ovrednoten na 110 kV, 20 kV in 690 V zbiralki, in sicer analitično po postopku standarda IEC 61000-3-3 ter simulacijsko s kvazi-dinamično simulacijo v programu DIgSilent PowerFactory. Vse napetostne spremembe so obravnavane kot stopničaste (faktor oblike F = 1), zato rezultati predstavljajo oceno najslabšega primera. Obravnavani so scenariji s hitrimi spremembami moči, scenariji z oslabljenim omrežjem in arbitražno obratovanje hranilnika. Prispevek k jakosti flikerja je največji na priključni zbiralki hranilnika in se z višanjem napetostnega nivoja izrazito zmanjšuje. Jakost flikerja v vseh obravnavanih scenarijih ostane pod dovoljeno mejo, pri arbitražnem obratovanju pa se meji približa počasna sprememba napetosti, ki tako postane odločilno merilo namesto flikerja.

• Language: Slovenian
• Keywords: fliker, kakovost napetosti, baterijski hranilnik električne energije, kratkotrajna jakost flikerja, dolgotrajna jakost flikerja, relativna sprememba napetosti, IEC 61000-3-3, DIgSilent PowerFactory, arbitraža
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FE - Faculty of Electrical Engineering
• Year: 2026
• PID: 20.500.12556/RUL-187205
• COBISS.SI-ID: 291297027
• Publication date in RUL: 09.09.2026

Secondary language

• Language: English
• Title: Assessment of the impact of a battery energy storage system on flicker severity in the power system

Abstract

Battery energy storage systems (BESS) can change their active power quickly and in both directions. Because of this, they can change the voltage at the connection point and affect power quality. The purpose of this thesis is to calculate the flicker caused by fast power changes of a BESS, and to compare a simple analytical calculation with simulation results. A simple network model is used. It consists of a strong 110 kV grid (1500 MVA), a 110/20 kV transformer, a constant load, and a 5 MW storage system connected through a power conversion system (PCS) and a 20/0.69 kV transformer. Flicker is calculated at the 110 kV, 20 kV and 690 V busbars. The analytical calculation follows the IEC 61000-3-3 standard, and the simulation is a quasi-dynamic simulation in DIgSilent PowerFactory. Three cases are studied: fast power changes, a weaker grid, and arbitrage operation. Flicker is largest at the busbar where the storage system is connected, and it becomes much smaller at higher voltage levels. During arbitrage operation, the slow voltage change is more important than flicker.

• Keywords: flicker, voltage quality, battery energy storage system, short-term flicker severity, long-term flicker severity, relative voltage change, IEC 61000-3-3, DIgSilent PowerFactory, arbitrage