FEATURES OF VOLTAGE CONTROL IN ELECTRICAL ENERGY DISTRIBUTION SYSTEMS WITH LOCAL ENERGY SOURCES

The article deals with the identification and justification of the most rational approaches and technical solutions for voltage control in electrical distribution systems with the local non-dispatchable and dispatchable energy sources in their structure. It has been demonstrated that under conditions in many cases the use of traditional methods of determining the parameters of technical means to realise centralized voltage control using distribution transformers and transformers of power substations not only does not allow to ensure permissible voltage deviations for consumers, but even will deteriorate the quality of electric energy. This is especially true to the situation when the local energy sources are concentrated in separate distribution feeders. In this regard, the paper proposes a modified algorithm for determining the law of voltage control applied to transformer of power substations, demonstrates the possibility and effectiveness of a targeted impact on voltage regimes due to a forced change of the active and reactive power flow in separate feeders with local energy sources. For this purpose, it is planned to use energy storage devices and alternative energy sources that are connected to the network through the inverter interface. Due to the use of the reactive power sensitivity matrix, it becomes possible to determine the most appropriate network nodes, in which alterations in reactive power will be the most effective from the point of view of impact on the voltage levels. Under these conditions, in many cases, by the alteration of load flow in the feeder with local energy sources, it is possible to increase the homogeneity of the load curves of all distribution feeders and, due to this, to improve the efficiency of voltage control without involving investments in the installation of additional voltage control equipment.