Durch den erhöhten Anteil von dezentralen Erzeugern wie Photovoltaik-und Windkraftanlagen sind neue Ansätze für eine bessere Integration in das Stromnetz erforderlich. Einen Ansatz stellen Softwarelösungen dar. Bisher werden Stromnetze von Leitwarten und deren Software gesteuert und überwacht. Eine Leitwarten-Software ist aber oft ein in sich geschlossenes System, das nur von dessen Anbieter gewartet und um neue Funktionen erweitert werden kann. Es können aber auch andere Hersteller neue Lösungen anbieten, die vielleicht besser und günstiger sind. In dieser Dissertation wird eine...

Nowadays distributed energy resources (DER) can provide certain reactive power flexibility for voltage support in alternating current power systems. Besides local voltage support at the distribution level, the DER can also provide reactive power flexibility at the transmission-distribution (T-D) interface, which can improve the reactive power grid adequacy of the distribution level. The term reactive power grid adequacy describes the compliance level of a distribution grid with a predefined reactive power range at the T-D interface. However, a challenge in grid planning procedures is the...

This work addresses the monitoring and state estimation of electrical grids, especially at the distribution level. For economic and technical reasons, grid monitoring cannot be implemented with a similarly high measurement density as in transmission grids. Two new monitoring methods, which are designed for low measurement density, are therefore presented for use in real-time grid operation. First, a heuristic monitoring method is presented, which does not require pseudo-measurements and estimates voltage magnitudes and line loadings. Second, a monitoring method based on artificial neural...