Optimization Based on Reactive Power in Frequency AC Generating System

This approach calls for the nonlinear fore bay level, tailrace level, penstock loss, and hydropower production functions to be replaced with their piecewise linear approximations. In this generating system, the power winding produces the VFAC electricity to feed loads, and the control winding is connected to a static excitation converter to keep the output voltage stable. Based on the change law of the reactive power provided by the control winding, an improved instantaneous slip frequency control strategy both with the load active and reactive power feed forward is proposed to improve the system dynamic performance. However, the effects of the linearization of the nonlinear functions and related constraints on solution feasibility have not been fully discussed in the literature. The information of the load active and reactive power is employed through two feed forward loops to rapidly change the reactive power provided by the control winding, so as to quicken the regulation of the slip frequency and excitation reactive power. The simulations show that the system using the strategy has a good dynamic performance with inductive and capacitive loads, and demonstrate the correctness and validity of the proposed control strategy.

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