Abstract
ABSTRACTDroop control is the conventional way to share the demand power among the generators in a microgrid. Analyzing this control method shows that it has poor performance in reactive power sharing. Generated reactive power of each microsource depends on the active load demand. In this paper, a control method is proposed to improve the reactive power sharing performance. It is indicated that higher reactive power droop gains make the generated reactive power to be less influenced from the changes in active load. However, high droop gains can lead the system to instability. Hence considering eigenvalue analysis of the microgrid, a new auxiliary controller is proposed to damp the oscillations caused by high droop gains. In the new method, there is not the need for monitoring the grid impedance to tune the controllers. To verify the proposed method, load step is applied to a test microgrid and the results are shown. In the new method, total generated reactive power is reduced in comparison to the conventional droop controller and the system stability is maintained.
Highlights
An increasing attemp is made in the utilization of DGs
Power sharing quality of conventional droop control method is analysed in an islanding microgrid
In this case, assigned reactive powers to the DGs are strongly increased by stepping up the active load
Summary
An increasing attemp is made in the utilization of DGs. Performing clean and low cost energy especially by renewable energy resources has increased the attention to develop new technologies in this research area. Droop control method is a way to achieve decentralized power sharing for parallel inverter interfaced DGs [14] It mimics the operation of governor and exciter of a synchronous generator to adjust the frequency and voltage of each micro source. The conventional frequency-voltage droop technique shares the active load perfectly, because the frequency is a global variable in the steady-state condition As it can be seen, the reactive power is not shared according to the same determined droop gains (k2). In this case, active powers of the generators are the same as diline1q dt
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