Abstract
This paper proposes a novel control method for enhancing transient stability by using renewable energy sources (RES). The kinetic energy accumulated in a rotor of variable speed wind generator (VSWG) is proactively used as the active power source, which is controlled according to the frequency measured at the wind farm. In addition, coordinated reactive power control according to the grid voltage is also carried out to more effectively use the kinetic energy of the VSWG. The effects of the proposed control system were evaluated by simulation analyses performed using a modified IEEE nine-bus power system network made up of synchronous generators (SGs), a photovoltaic (PV) system and a VSWG-based wind farm. Furthermore, the coordinated reactive power control between the VSWG and PV system was also demonstrated.
Highlights
As a result of the need to minimize environmental impacts and diversify the electricity mix, the number of grid-connected renewable energy sources (RES), such as wind generators (WGs) and photovoltaic (PV) systems, has been steadily growing
The simulation results for the power system model with SG3 installed, in which it is assumed that 3LG fault occurs at F1, are presented
The transient stability can be enhanced by releasing the kinetic energy accumulated in the rotor of the variable speed wind generator (VSWG)
Summary
As a result of the need to minimize environmental impacts and diversify the electricity mix, the number of grid-connected renewable energy sources (RES), such as wind generators (WGs) and photovoltaic (PV) systems, has been steadily growing. The reactive power injected from the VSWG to the grid increases the load voltage and the power demand This leads to enhanced transient stability and reduced release of the kinetic energy of the VSWG. The rotational speed was adjusted over a large range by using the full power converter, as mentioned above, the speed variation during the control mode could be reduced by the reactive power support This means that the proposed method can handle more severe disturbances and offer increased reliability as a power system stabilization device. As the disconnection of many power sources owing to the voltage drop may cause the SGs to be out-of-step and a blackout, we gave the reactive power control higher priority than the kinetic energy control.
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