Secondary voltage regulation based on average voltage control

Edwin H. Lopera-Mazo, Jairo Espinosa

Abstract


In thisThis paper a comparison compares between a conventional Secondary Voltage Regulation (SVR) scheme based on pilot nodes and with a proposed SVR that taking takes into account average voltages of control zones is done. Voltage control’s significance for the operation of power systems has promoted several strategies in order to deal with this problem. However, the Hierarchical Voltage Control System (HVCS) is the only scheme effectively implemented with some relevant applications into in real power systems.
The HVCS divides the voltage control problem into three recognized stages. Among them, the SVR is that responsible for managing reactive power resources to improve the network voltage profile. The cConventional SVR is founded based on dividing the system into some electrically distant zones and on controlling the voltage levels of some specific nodes of in the system (named pilot nodes), whose voltage levels are accepted as appropriate indicators of network voltage profile.
The SVR approach proposed in this work does not only consider the voltage on pilot nodes, but it also takes the average voltages of the defined zones to carry out their respective control actions. Additionally, this innovative approach allows integrating to integrate more reactive power resources into each zone according to some previously defined participation factors.
The comparison between these strategies shows that the proposed SVR achieves a better allocation of reactive power in the system than the conventional SVR, and it is able to keep the desired voltage profile, which has been expressed in terms of the network average voltage.


Keywords


Secondary Voltage Regulation; Average voltage; Conventional SVR; Hierarchical Voltage Control System; Power System.

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