Reactive Power Management at the Network Interface of EHV- and HV Level

The reactive power exchange at the interface of EHV and HV level is increasingly subject to stringent requirements. Distribution system reactive power management helps to meet these requirements. Feasible and efficient solutions are needed. In this paper, an application-oriented and cost-efficient reactive power management concept (Q-Management) is developed and introduced, which allows the distribution system operator (DSO) to control the reactive power exchange at the grid interface of EHV and HV level by utilizing local reactive power capabilities of DGs and compensa-tion devices. In a case study, the proposed Q-Management concept is applied in an exemplary distribution grid of a German DSO "Bayernwerk Netz GmbH" and investigated in a simulation environment by performing time series simulation. Based on the achieved results, a cost-benefit analysis is carried out. The technical and economic potential of the proposed Q-Management concept are assessed with regard to the operation and investment costs. The advantages and disadvantages of the proposed approach are discussed in detail.