Emergency Support of Transmission Voltages by Active Distribution Networks: A Non-Intrusive Scheme

Non-negligible amounts of Distributed Generating Units (DGUs) are already connected to power systems, predominantly medium- and low-voltage networks. The interaction between distribution transmission systems is gaining the attention system operators. Given high controlability DGUs, active networks can potentially support during emergency situations. Previously proposed voltage controls involving network assets focused on preserving integrity, even if it implies affecting operation (intrusive schemes). More needs be devoted supporting voltages, while (non-intrusive This paper introduces a new adaptive non-intrusive control scheme based synchronization DGUs load tap changer corresponding transformer. conclusions derived from time-domain simulations using an extended version IEEE Nordic test for stability assessment.