Article ID: 2025EAP1060
In the case of distributed power source fault crossing, traditional methods have limited negative sequence voltage suppression effect and are difficult to reduce the negative sequence voltage to the ideal level, which affects the stability and safety of microgrid operation. Therefore, an improved method for on-site feeder automation considering distributed power source fault crossing is proposed. This method deeply analyzes the impact of distributed power access on feeder automation, sets anti islanding protection values for fault crossing situations, and preliminarily improves the feeder automation structure. To further optimize the effect, an improvement strategy based on regional numbering is proposed, which divides the range of power grid areas connected to distributed power sources, assigns logical numbering and adjusts logical operation time, and achieves the coordinated optimization of power grid fault timing coordination logic and anti islanding protection setting strategy. The experimental results show that this method can effectively suppress the negative sequence voltage connected to the distributed power microgrid, and approach the ideal level of negative sequence voltage; At the same time, the ratio error of the distance between the fault point and the protected end to the total length of the line is less than 0.01, the total exit time is controlled within 40ms, and the risk of fault rejection/misoperation is less than 0.5%. Significantly improved the stability and fault handling capability of the power grid, providing reliable technical support for the intelligent management of the power system.
