Abstract
With the intention of keep the customer voltage within a nominal voltage boundary (the South Korea voltage regulation in range of 220 V ± 6% for a single phase), the SVR (step voltage regulator) method in the primary feeder has been seriously systematized for the scheduled tap time delay (from a minimum of 120 s to a maximum of 900 s). The voltage must be compensated for the primary feeder during the tap delay time of SVR. However, when RES (renewable energy resource) is connected with the primary feeder, the customer voltage could exceed the nominal voltage boundary. Therefore, in order to keep the secondary feeder voltage within the nominal voltage boundary at all the time, this paper proposed a novel voltage control method in the primary feeder using coordinated controls between ESS (energy storage system) and SVR. Through the simulations based on PSCAD/EMTDC which is analysis tool of power system, it is confirmed that the proposed algorithm can effectively control the customer voltage within allowable limitation.
Highlights
As electrical power systems have been decentralized with the improvement of technology for renewable energy resource (RES), RES installs in the primary feeder
The customer voltage could not exactly be kept within the nominal voltage boundary because the voltage was not compensated during the delay time of step voltage regulator (SVR)
The paper proposed the modeling of SVR/ESS based on the PSCAD/EMTDC and the optimal coordinated control method of SVR/ESS in the primary feeder connected with the RES
Summary
As electrical power systems have been decentralized with the improvement of technology for renewable energy resource (RES), RES installs in the primary feeder. SVR is typically installed at the position of 10% voltage drop in the primary feeder, and it is operated by a line drop compensation method [2,3,4]. Energies 2019, 12, 3357 and SVC have been proposed to solve the voltage problem caused by distributed power as shown in Table 1 [6,7,8,9]. ESS interception acts as the voltage stabilization during the time delay
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