Fault identification method for distribution lines interruption based on distributed power and high frequency signal injection

To solve the problem that it is difficult to identify the fault of distribution lines interruption, the paper researches a technique, which applies the method of injecting distributed power signals into the distribution lines for fault identification of distribution lines interruption. By analyzing the characteristic parameters of distribution lines in both transient and permanent faults, the paper represents the criteria of fault natures, and designs the logical module of overall control of signal injection. Also, the paper formulates a control scheme of inverter, which could output three-phase symmetrical voltage, to prevent power supply missing in islanded system. Finally, the paper tests the feasibility of the scheme by simulation experiment. The scheme provides the distribution network with a high-speed, targeted, safe and reliable method exempting additional power supply of fault identification for lines interruption.