Heckel, Jan-PeterJan-PeterHeckelSteffen, TomTomSteffenBecker, ChristianChristianBecker2022-10-212022-10-212022-09-02CIGRE 2022 Paris Sessionhttp://hdl.handle.net/11420/13828Integrated Energy Systems (IES) are assumed to be a key factor for future energy systems. The accompanying opportunities and risks in coupling the energy sectors electricity, gas and heat are still to be evaluated. On the one hand, IES can enhance the flexibility in the consumption and storage of energy from renewable sources. Thus, fluctuating generation of energy from renewable sources and the volatile demand of consumers can be balanced using load management and storages from the gas and heat sector. On the other hand, every coupling technology that is added to the overall energy system increases dynamic interactions between the sectors. These dynamic interactions can become a risk for the overall system stability and in particular the stability of the electric power system. Due to the constellation of time constants, frequency and voltage stability are considered as the main stability phenomena affected by dynamic interactions with the gas and heat system. In this paper, the voltage stability in IES is assessed by applying dynamic simulations with the TransiEnt Library, an open source model library containing state-of-the-art component models for the dynamic modelling of IES. An representative grid is modelled and used for analysing different heat and gas system components as dynamic and physical load models with respect to voltage stability. A key take-away from the results is that the scenarios of the modelled grid with a realistic parametrisation can lead to a voltage collapse. Furthermore, the simulations with electric boiler and heat pump models show a time domain behaviour of bus voltages that complicates the online voltage instability detection by schemes using the voltage gradient as measure. Moreover, state-of-the-art online voltage instability detection schemes even fail in the considered scenarios. Consequently, it is proposed to adapt existing voltage instability detection schemes and to develop new approaches.enIntegrated Energy Systems; Voltage Stability; Dynamic Simulation; Electric Boiler; Heat Pump; Resilience; TransiEnt LibraryConference Paperhttps://e-cigre.org/publication/c1-11096_2022https://www.cigre.org/userfiles/files/Events/2022/TECHNICAL%20PROGRAMME%20Dec%202021.pdfOther