A Novel Distributed Generation Injection Signal Line Fault Detection Technology

For solving such problem as difficult identification of fault of distribution line and improving the safety of reclosing operation of distribution line, the principle of fault character identification of distribution line based on injection signal of distributed generation is proposed. In this paper distributed generation injection signal, based distribution line fault detection technology was proposed. Briefly introduce the equivalent parameters of distribution line, in case of transient and permanent fault conditions, are analyzed and the criterion of fault character identification. In addition to this, a control scheme for the inverter that will output a three-phase symmetrical voltage signal in the event that there is a loss of power to the system has been designed. The Matlab simulation serves to validate both the practicability and soundness of the strategy that has been suggested. The result show that uses the existed injection signal of the distributed generation device for fault identification, and has such advantages as accurate fault detection, convenient implementation and economic reliability without additional power supply.