Output power leveling of wind generation system using inertia of wind turbine

Abstract

Wind energy is a significant and powerful natural resource that is safe, clean, and abundant. However, wind energy has a drawback of having only 1/800 density as compared to that of water energy, and it is not constant and wind turbine output is proportional to the cube of wind speed, which causes the generated power of wind turbine generator (WTG) to fluctuate. In this paper, a technique is proposed for output power leveling of a wind generation system. Wind turbine blades have a large inertia compared to the inertia of generator. The inertia of the rotor behaves like an inductor in an electrical circuit. It helps smooth the wind turbine output power, stores energy during acceleration, and restores energy during deceleration. The effectiveness of output power leveling control is verified by simulations for the wind power generation system.

Pitch angle control of a grid connected wind turbine

“…The power output to grid is initially controlled by the pitch controller and then by Pulse Width Modulation (PWM) converter. The input power to the turbine, P w is given by [7],…”

Mitigation of wind power fluctuations in smart grids

“…The higher wind speed range is between the rated wind speed until the cut-off wind speed of a wind turbine. The concept of IWPS for the lower wind speed range is that the wind turbine will absorb and release kinetic energy to its rotor, described in [16] and [17]. For the higher wind speed range, a wind turbine already uses pitch control to protect the generator for speed overloading.…”

Performance predetermination of variable speed wind-driven grid connected SEIGs

“…However, due to the aerodynamic characteristics of the wind turbine, if the rotational speed is allowed to vary with varying wind speed, the maximum power (MP) output could be obtained from the generator and this power varies approximately as the cube of the wind speed [5][6][7][8]. So, even in the case of generators feeding power to the grid (GCIGs), variable speed operation is possible, if the generator output terminals are connected to the grid through suitable power electronic controllers, instead of feeding directly to the grid.…”