Wind-turbine generator for load-following and its applications to primary frequency support and small-signal stability improvement.
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.