Within GOPACS, effectivity indicates to what extent a redispatch action on a specific grid connection (EAN) influences a congestion problem on a particular part of the electricity grid (net element). This influence is expressed as a value between -1 and 1.
A net element is a connection in the grid with a defined direction, for example from a high-voltage to a medium-voltage substation. The effectivity of a connection on that net element is calculated through load flow analysis and recorded in an effectivity matrix. This matrix depends on the topology of the grid (i.e. which switches are open or closed and which routes are active).
Effectivity is needed to determine whether a bid (e.g. a buy or sell order) contributes to resolving congestion, and how much influence that bid has. In redispatch, the net effect on the power flow across the congestion point is determined by calculating the difference in effectivity between two bids (one increasing and one decreasing power usage or generation).
