The paper proposes a concept and architecture for distributed low voltage network management. Active distribution network concept is capable of real-time monitoring of whole grid and it may utilize the flexibility of distributed energy resources to enhance the hosting capacity of low voltage networks. The proposed architecture creates a bridge between fully centralized automation systems like SCADA and distributed system consisting of secondary substation automation and smart metering. In this way the proposed system extends the existing automation system to low voltage networks. It may also provide required real-time visibility and operational management to low voltage network without overloading the centralized automation system. The system has been designed for multiple low voltage network use cases like network monitoring, congestion management and fault management.

There are many factors, such as distributed energy production and increased power quality requirements, why the importance of LV network is increasing rapidly in the distribution network. Therefore more intelligent solutions are required. These solutions can be utilized to improve LV network management such as power quality and load flow management. At the LV network level, power quality has not traditionally been monitored at all. The knowledge about power quality is based on the measurements at HV and MV level and the case specific measurements due to customer complaints. The paper discusses the extension of the power quality monitoring of some quantities to the LV level by utilizing the concept proposed by the FP7 European project INTEGRIS. The paper also presents results about how the power quality algorithm, developed by the Tampere University of Technology, was acting in long term measurements in the real LV network.Index Terms--distributed generation, low voltage network, power system measurements, power quality, smart grid

Remotely readable smart meters installed for customers and smart measurement devices developed for secondary distribution substation can be utilized to improve LV network monitoring and management. Today the real-time information about the distribution network state is mainly gathered from the MV network. The paper discusses the extension of the network monitoring and management to the LV level by utilizing the concept proposed by the FP7 European project INTEGRIS. In INTEGRIS concept the smart meters and secondary substation measurement device were connected as part of the LV network. This paper presents the testing of the INTEGRIS concept in RTDS (Real Time Digital Simulator) environment, as well as the testing results to demonstrate how well the LV network monitoring and management could be done by utilizing measurement devices in the secondary substation and in the customer's end.