Voltage Control in Transmission Grids Considering Uncertainties of
Renewable Energy Sources_preprint
Abstract
Power traders and system operators need to balance the uncertain
generation of renewable energy sources by adapting the dispatch of
conventional power plants. This poses a challenge to voltage control in
power system operation. Accordingly, this paper presents a method to
determine voltage magnitude probability densities which are integrated
into an optimal reactive power flow to consider an uncertain active
power generation. First, the probability densities are determined by
Monte Carlo simulations including a unit commitment problem to derive
the dispatch of conventional power plants. Second, uncertainty
restrictions are used to create soft constraints for the optimal
reactive power flow, which mitigates the risk of voltage limit
violations. By adapting the soft constraints slack costs, the
consideration of uncertainties can be prioritized in relation to other
objectives, such as the reduction of active power losses, or reactive
power costs.