Resumen:
The most noticeable developments foreseen in power systems involve Distribution Networks (DNs). Future DNs are expected to host a large percentage of renewable energy sources [1], and small Dispersed Generation Units (DGUs) at distribution level are expected to supply a growing percentage of demand [2]. This proliferation of DGUs and the advances in infocommunications are key drivers of the transformations seen today in DNs.The increased penetration of DGUs has given rise to new operational problems in DNs, such as over-voltages and thermal overloads at times of high DG production and low load. In response to these problems, several DN control schemes have been proposed to dispatch the DGUs and ensure secure network operation [3]. For instance, in [4], two coordinated voltage control algorithms are proposed. The first is based on simple control rules in which the Load Tap Changer (LTC) of the main transformer is used to control voltages. If this action is unable to restore all network voltages within limits, the resource with the highest effect on the most problematic bus is selected. The second algorithm is based on optimization—more precisely, a mixed integer nonlinear programming problem is used to minimize costs of network losses and generation curtailment, subject to voltage limits, active and reactive power limits of Distributed Energy Resources (DER), and branch power flow limits. The discrete control variables contain transformer tap position and switched capacitors while the continuous variables are the set points of real and reactive power or terminal voltages of DER. The reactive power coordination scheme …
