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The inertia support of DC microgrid system is less, the instability of output power of distributed generation and the sudden change of load cause the sharp fluctuation of DC voltage, which endangers the safe and stable operation of DC microgrid. In order to solve the problem of small inertia of DC microgrid, a virtual inertial control strategy with exponential change is proposed based on U-I droop control to slow down the voltage shock caused by disturbance of the system. The DC microgrid system is built in MATLAB/Simulink. The simulation results show that the proposed strategy can increase the inertia of DC system for a short time, suppress DC voltage oscillation, effectively improve the transient response of DC voltage disturbance and improve the operation stability of the system when the power shortage suddenly occurs.
Inspec keywords: power generation faults; power system stability; distributed power generation; power grids; power generation control
Subjects: Control of electric power systems; Distributed power generation