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Generator rotor angle droop control and its load-following characteristics

The penetration level of distributed generation (DG) grows rapidly bringing more frequency fluctuation nowadays. Besides, the power system grows in size day by day; the assumption that the frequencies are the same across the grid is no longer valid. These all bring out problems to the frequency control mechanism currently used. The recently proposed rotor angle control strategy may solve these problems. Apart from suppressing low-frequency oscillations (LFO) more effectively, the new control strategy may also replace automatic generation control (AGC) presently used. The balance between generations and loads can be restored quickly and automatically after the loads change. No intervention from a dispatching centre is needed. However, the currently proposed rotor angle controller has an integration block. This will lead to negative damping torque for very low frequency input and frequent turbine valve adjustment. Removing the integration block from the controller can solve these problems. The control strategy will become a kind of angle droop control then. The rotor angle droop (RAD) control can also maintain generation load balance and restore frequency to rated value without the intervention of a dispatching centre since it is also decentralized and autonomous. Besides, the new strategy will distribute load variance (although not precisely) to generators according to their rated capacity.