Abstract
This paper investigates the reactive power balance of the Zealand side of the Danish transmission system (DK2) by using QV-curves. The study is performed in cooperation with Energinet, who is the Danish transmission system operator (TSO). Firstly, this paper aims to map the reactive power balance with the current challenges in the system, which appears due to a decision of changing overhead lines in the scenic area to cables. Secondly, a method is derived for obtaining a comprehensive overview of the impacts that future projects might have on the system. By dividing the transmission system into smaller areas, it is possible to analyze how the reactive power will affect the voltage; moreover, it is favorable to analyze and handle the challenges in the reactive power balance locally. This helps the TSO to quickly determine the lack of reactive power devices and issues that might occur in future expansions of the system. For this paper, a full-scale model of DK2 and SCADA-data has been utilized. It covers the period from 01-01-2016 to 20-08-2017 between the TSO and the Distribution System Operator (DSO). The studies have shown how the location of the wind production will create issues in the reactive power balance.
Highlights
Reactive power is needed to transfer active power in an AC-system
The size of the limit are calculated by adding an expansion factor of 10% of the maximum active power, and calculate a maximum reactive power exchange between the Distribution System Operator (DSO) and transmission system operator (TSO)
The analysis performed in this paper shows a need for both capacitive and inductive power in the traditional method
Summary
Reactive power is needed to transfer active power in an AC-system. The reactive power stored in the AC-system, which is constantly changing state between being stored in electrical fields (capacitive) and magnetic fields (inductive), is called the oscillating power [1]. Reactive power is associated with a voltage changes and does not have the ability to be transferred over long distances, whether physical or electrical length. This means that the reactive power must be handled locally [4]. There is a need to manage both the current reactive power balance and to maintain the reactive power balance when designing future projects in the electrical power system
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