Inverter-Interfaced Distributed Generator Optimal Configuration Based on Process Immune Time

In the assessment of voltage sag, due to the existence of uncertain operating interval of voltage sag tolerance characteristic curve, it is difficult to measure the economic losses caused by voltage sag when the equipment suffers from voltage sag of this interval type. In this paper, a optimal configuration model of Inverter-Interfaced Distributed Generator based on process immune time is proposed, which calculates the economic loss caused by voltage sag according to whether the key physical parameters of industrial process meet the acceptable limits. The model considers both the economy of reversible distributed generation under normal operation and its ability to suppress voltage sag of distribution network under fault operation. The objective is to minimize the investment cost, network loss, power purchase cost of upper power grid and economic loss of voltage sag. The genetic algorithm is used to solve the model. The simulation results show that the optimal configuration scheme of reversible distributed generation considering voltage sag has better overall economy and stronger ability to suppress voltage sag.