The Inverter Interfaced Distributed Generation (IIDG) control strategy affects the power system significantly. However, the current strategies are difficult to take into account the requirements of fault ride-through, relay protection, and fault analysis. This paper proposes a flexible positive and negative sequence current control strategy of IIDG to inject positive and negative sequence reactive current into the grid under asymmetrical fault conditions. Based on this strategy, the equivalent sequence network model of IIDG is proposed. Simulation results show that the proposed strategy can improve the fault ride-through capability of IIDG, and can keep the sequence component characteristics of fault current under asymmetrical fault conditions. This work is supported by National Key Research and Development Program of China (No. 2017YFB0903201).