Validating new operating procedures and ensuring interoperability in local energy grids - the "Sandbox Ortsnetze"

Abstract:
The integration of renewable energies, electric vehicles, heat pumps, and decentralized storage systems into local energy networks poses novel challenges for grid stability and efficiency. Local grids must become more flexible, intelligent, and interoperable in order to meet future requirements; however, traditional test methods are insufficient to realistically assess the current and future complex interactions between technologies and networks. The "Sandbox Ortsnetze" of the Fraunhofer IEE provides a flexible test environment that emulates a real network in a controllable setting, featuring versatile topologies in conjunction with genuine and simulated network components. This setup facilitates the examination of dynamic scenarios, including voltage control through reactive power, the integration of bidirectional chargers, the stabilization of network cells with network-forming systems, and the implementation of network-oriented controls in accordance with EnWG. Empirical studies demonstrate that targeted control methodologies and intelligent system functionalities can enhance grid stability, circumvent bottlenecks, and augment the capacity for loads and generators. The progressive enhancement of the "Sandbox Ortsnetze" into standardized and system-based test procedures is poised to play a pivotal role in validating contemporary technologies and ensuring future grid reliability.