Abstract
In a microgrid, grid-connected inverters, as the interface between the distributed power supply and grid, cannot provide inertia support for the system. The control strategy of virtual synchronous generator (VSG) based on grid-connected inverters can enhance the stability of system frequency. In order to make the frequency response that has a smaller overshoot and a shorter settling time, a self-adaptive damping control strategy based on the relationship between the damping and the maximum frequency deviation for microgrid VSG is presented. The small-signal mathematical model of VSG is established, and the range of the damping coefficient is determined. Finally, simulation experiments are carried out with MATLAB/Simulink, and the effectiveness of the proposed control strategy is verified by comparing it with various damping control methods.
Highlights
Influenced by the global energy crisis, the penetration rate of the distributed power generation system using renewable energy is increasing
As the interface between most distributed energy and power grid, grid-connected inverters play an important role in transmitting power to the power grid [1,2,3]
Unlike the synchronous generator (SG), the inverters based on power electronics technology have almost no internal inertia, which affects the stability of the power system and cannot provide frequency and voltage support for the power grid with distributed generation
Summary
Influenced by the global energy crisis, the penetration rate of the distributed power generation system using renewable energy is increasing. As the interface between most distributed energy and power grid, grid-connected inverters play an important role in transmitting power to the power grid [1,2,3]. Unlike the synchronous generator (SG), the inverters based on power electronics technology have almost no internal inertia, which affects the stability of the power system and cannot provide frequency and voltage support for the power grid with distributed generation. In order to make new energy that has a certain frequency support capability, the droop control strategy is usually adopted in the inverter [4,5,6,7]. The droop control is to simulate the droop characteristics of SGs. When the frequency and voltage of the systems change, the output active power and reactive power of inverters change according to the droop characteristic. The inertial support capability of the SG is not realized
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