Abstract:
In today’s power grid, the penetration of wind energy has been increasing.
Meanwhile, many relevant issues have been explored. Among them, a novel active
power control strategy named load-following has been given attention recently.
Conventionally, variable speed wind-turbine generators (WTGs) are controlled to work at
the maximum power extraction point. However, the load-following method allows the
WTGs to be de-loaded and sacrifice part of the wind power. This is meaningful in some
stand-alone power systems where the energy should be limited to match the local load
demand. This thesis continues to investigate a better load-following method for the wind
farm. The problem of the rotor inertia of wind turbine is analyzed and solved with the
Speed-Up/Down Averaging (SUDA) method. A configuration for a wind farm with
improved load-following is then proposed. Based on this improved feature, two
applications in terms of primary frequency support and small-signal stability support are
investigated.
