Abstract:
Nowadays, with the development of power systems, considering
environmental pollution is one of the most important challenges for designers and
electricity market activists. These factors have caused the planners to use all the
current services, including the penetration of renewable resources, reactive power
controllers, operation of the reserve systems, stabilizers of the power system, and
load management methods in operation. In this project, the dynamics of DG units
integrated with the main grid are evaluated. So, distributed voltage controllers are
used to restore the voltage values to their corresponding reference values for all DGs
in a limited period of time, and a distributed frequency control based on aggregation
of units is used. In the frequency recovery mode, there is a challenge that the control
inputs must be equal to each other in the steady state to satisfy the power sharing
property. For this purpose, a distributed PI controller has been used to mitigate the
power flucyuations and recover the frequency. During the first stage, the voltage
range of the distributed generator is greatly reduced while the frequency is
synchronized with the load at a certain value. In this regard, both voltage and
frequency have significant differences with their reference values. Therefore, it is
necessary to restore them in the secondary control layer. When the distributed
secondary control is activated, both the power value and the frequency value are
quickly restored to their reference values. In fact, although a series of transitory
states are observed at first, the frequency stabilizes at its permanent value. By
examining the obtained results, it is clear that the distributed secondary control level
can eliminate the amounts of violations created in the field of power and frequency
control. In fact, when the secondary control level is activated, the active power
distribution is well managed by the participation of different sources
