Smart grid systems are characterized by high complexity due to interactions between a traditional passive network and active power electronic components, coupled using communication links. Additionally, automation and information technology plays an important role in order to operate and optimize such cyber-physical energy systems with a high(er) penetration of fluctuating renewable generation and controllable loads. As a result of these developments the validation on the system level becomes much more important during the whole engineering and deployment process, today. In earlier development stages and for larger system configurations laboratory-based testing is not always an option. Due to recent developments, simulation-based approaches are now an appropriate tool to support the development, implementation, and rollout of smart grid solutions. This paper discusses the current state of simulation-based approaches and outlines the necessary future research and development directions in the domain of power and energy systems.
Future power systems will contain more converterbased generation, among which voltage-sourced converter VSC-HVDC connected offshore wind power plants (WPP). Their interaction with the onshore system influences power system dynamics in the transient stability time-frame. The respective protection and control methods which cause this interaction must be taken into account in grid-integration studies performed today.This paper gives insight about the effect of typically required fault ride through (FRT) and post-FRT measures of VSC-HVDC connected offshore WPPs on the combined AC and HVDC system dynamics. Several important sensitivities are addressed, among which 1) FRT implementation, 2) the post-fault active power recovery rates, 3) the AC network dynamic characteristics, and 4) the HVDC topology.The analysis is first performed as a proof of concept on a small benchmark system, and subsequently generalized to a realistic dynamic model of the future Northwestern European power system. The results of this paper can be used as reference for understanding the effects of large-scale VSC-HVDC connected offshore WPPs on the stability of the onshore interconnected power systems.
Abstract-The gradual deployment of intelligent and coordinated devices in the electrical power system needs careful investigation of the interactions between the various domains involved. Especially due to the coupling between ICT and power systems a holistic approach for testing and validating is required. Taking existing (quasi-) standardised smart grid system and test specification methods as a starting point, we are developing a holistic testing and validation approach that allows a very flexible way of assessing the system level aspects by various types of experiments (including virtual, real, and mixed lab settings). This paper describes the formal holistic test case specification method and applies it to a particular co-simulation experimental setup. The various building blocks of such a simulation (i.e., FMI, mosaik, domain-specific simulation federates) are covered in more detail. The presented method addresses most modeling and specification challenges in cyber-physical energy systems and is extensible for future additions such as uncertainty quantification.
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