Advanced Automatic Generation Control with Automatic Compensation of Tie-Line Losses

This article proposes the improvement of present-day common automatic generation control schemes by the simple addition of area tie-line loss compensation to the standard conventional control algorithm. Conventional automatic generation control regulators of interconnected power systems are developed, assuming the same tie-line power flows on both tie-line terminals. This assumption has the systematic (steady-state) output errors on controlled variables: the system frequency (and indirectly on the synchronous time) and areas tie-line exchanges. To eliminate large deviations of these variables outside of prescribed limits, their periodical corrections are necessary. This is achieved by simple modification of classical automatic generation control regulators, with the addition of corresponding tie-line losses to the area control error signal on standard automatic generation control regulator inputs. With such a modification, area automatic generation control regulators would attain better control performance, with less frequent operation switching from normal to the corrective mode. In addition, they become able to share tie-line power losses to interested parties by a simple adjustment of agreed participation coefficients set on corresponding automatic generation control regulators. The benefits obtained by such modified automatic generation control are paid by one additionally needed remote measurement per tie-line from their terminals in neighboring areas, while all other elements of existing automatic generation control schemes remain unchanged.