Abstract
The stability of bus voltage is the main target of DC microgrid operation. DC microgrid including constant power load, distributed generations employed droop control, and resistive load is investigated. The constant power load can reduce system stability margin, and even cause bus voltage oscillating. The droop control can share the current among different distributed generations, but it can result in the bus voltage deviating from the nominal stable operating point and even destroys the stable operation. Take into account above factors, the model of DC microgrid is established and its stability analysis is researched by using the method of Lyapunov and the corresponding constraints of stable operation are obtained. The stable region of the system with different parameters is explored. Finally, the MATLAB/Simulink simulation model of the DC microgrid is established and the simulation results verify the effectiveness and correctness of the analysis method.
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