METHOD AND DEVICE FOR DETECTING ISOLATED OPERATION OF POWER GENERATION INSTALLATIONS

摘要

The invention describes a method for detecting isolated operation of power generation installations (5) which are set up to generate electrical power and can be coupled to an interconnected power supply system (1) for feed operation. The power generation installation (5) operates in isolation with respect to the interconnected power supply system when no power is exchanged between the power generation installation (5) and the interconnected power supply system (1). The method has the steps of: recording the temporal profile of the mains frequency present in the region in which the power generation installation (5) is connected to the interconnected power supply system (1) and evaluating the temporal profile of the mains frequency in order to detect isolated operation. Evaluating the temporal profile of the mains frequency comprises analysing the statistical features of the noise component of the temporal profile of the frequency of the mains voltage at the point at which the power generation installation (5) is connected to the interconnected power supply system (1), and isolated operation is detected using statistical behavioural features identified during analysis.