Abstract:

To solve the influence of distributed generation （DG） on the fault location and voltage quality of distribution network, the influence of various DGs on the short-circuit current were analyzed. The adaptation range of traditional distribution automation system was obtained, in which the fault location was based on the fault current distribution. An improved fault process strategy was proposed to meet the requirement of much larger amount of DGs connection, based on the coordination of the reclosing procedure and DG escaping after faults. The influences of DGs on the voltage deviation and voltage fluctuation of distribution network were analyzed. The judging condition to meet the requirements of voltage quality without the control of DG was proposed. The DG that could not accord with the judging condition could be monitored by distribution automation system to meet the requirements of voltage quality. The examples show that the proposed method is feasible.

Key words:  distribution network, distribution automation system, distributed generation（DG）, fault location, voltage deviation, voltage fluctuation