Abstract

The planning of reactive power compensation devices as part of the grid planning process is becoming increasingly important due to the decreasing reactive power reserves from conventional power plants. Planning such devices requires the consideration of the reactive power demand both during steady-state operation and disturbances as well as power flow shifts. To control the voltage in these scenarios, the location, rated power and technology of reactive power compensation devices must be identified. In this paper, a reactive power planning approach with a coupled determination of steady-state and dynamic reactive power demand is applied to a generic transmission system. The identification of the steady-state reactive power demand involves different characteristic grid use cases. The dynamic reactive power demand is determined via the analysis of critical power flow shifts within an hourly generation dispatch corresponding to the selected grid use cases. Power flow shifts leading to insufficient voltage stability reserves and high voltage gradients are considered in the reactive power planning. Results emphasize that the coupled determination of steady-state and dynamic reactive power demand identifies a suitable portfolio

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