Mikroverkkojen ja hajautettujen energiaratkaisujen suojaus IEC 61850 -standardiin perustuen

Microgrids are a potential part of the future smart distribution grid with capability of island operation, envisioned to support the goals of increased use of renewable and distributed energy resources, active consumer participation and improved quality of electricity supply in the future power systems. This thesis examines the implementation of protection systems for microgrids and distributed energy resources using the IEC 61850 standard series. IEC 61850 is one of the core smart grid standards originally developed for substation automation, but extended in its usage to many areas including distributed energy resources. The main objectives of this thesis are analysing the implementation of microgrid protection, usage of IEC 61850 in distribution applications, and applicability of Multipower test environment of VTT Technical Research Centre of Finland in researching these subjects. A literature review of microgrid protection issues and proposed protection schemes as well as an overview of the IEC 61850 standard series and its extensions are presented. An adaptive protection scheme is implemented in an example microgrid configuration of the Multipower environment using IEC 61850, and its correct operation verified during islanding and in the case of a communication network failure. Finally, recommendations are given on the future development and research topics of the Multipower environment, including integration of different distributed energy resource units from other VTT research areas such as fuel cells and electrical vehicles to the system, studying the usage of different networks for communication inside the environment and testing of harmonization between IEC 61850 and other smart grid standards.