Loss Modeling of Large Hydrogenerators for Cost Estimation of Reactive
Power Services
Abstract
A new approach to predict the additional costs of reactive power system
services delivered by large hydrogenerators is proposed in this letter.
It is based on the application of the accumulated average efficiency
(AAE), which has recently been proposed. An optimal operational path
within the capability diagram with minimal losses is derived. This path
can be used to calculate additional losses from operational regimes
deviating from the optimal one for each active power level. Finally, the
additional losses are accumulated in a similar manner as the AAE to
estimate the extra cost of the operational regime, with ideal operation
as the reference. In addition, the accuracy of a data clustering
approach is explored to speed up the computation of the AAE and the
accumulation of additional costs.