A novel voltage-power coordinated control strategy for grid-connected inverters in low-voltage microgrids based on fast non-singular terminal sliding mode

• A voltage-power coordinated control system is designed to enhance the coordinated output capability of the microgrid grid-connected inverters (GCIs) output state, such as on-grid and off-grid, and simplify the complexity of multi-mode control systems. • The virtual compensation voltage is skillfully introduced to construct a voltage-power coordinated control relationship. • The fast non-singular terminal sliding mode (FNTSM) strategy is practically applied to implement the functions of each module in the control system for improving response speed and steady-state output accuracy. λ • The relationship between control parameters and FNTSM chattering is further revealed. The uncertainty of on-grid/off-grid operation states in the microgrid load side severely impacts the output state configuration and hardware safety of grid-connected inverters (GCIs). To enhance GCI's rapid coordination capability for output states and simplify the complexity of multi-mode controller integration, this paper proposes a novel voltage-power coordinated control system based on the fast non-singular terminal sliding mode (FNTSM) control strategy. Firstly, a power transmission model for microgrid GCI is established, analyzing the output voltage characteristics of GCI under power constraints, with virtual compensation voltage introduced to formulate the voltage-power coordinated control relationship; Subsequently, the FNTSM strategy is employed to govern functional modules of the system, complemented by stability verification through Lyapunov functions; Finally, simulations under multi-conditions are designed, through which the effectiveness of the proposed strategy is analyzed and validated. © 2017 Elsevier Inc. All rights reserved.