New approaches and technology of development adaptive to voltage oscillation leakage current protection systems used in isolated neutral system are proposed. The control algorithm of protection device developed using fuzzy logic, which allows adapting of protection devices' thresholds to network parameters changing. Linear integrated and square-law integrated criteria of protection device's threshold adaption for network parameters changing are developed and proved. The model and structure of automatic thresholds adaption system are developed, based on the fuzzy controller.
Ualikhan, I., & Josif, B. (2015). Development of control algorithm for adaptive leakage current protection devices’ using fuzzy logic. In Procedia Engineering (Vol. 100, pp. 666–671). Elsevier Ltd. https://doi.org/10.1016/j.proeng.2015.01.418