Method for frequency control of doubly-fed wind farm considering optimal rotor inertial kinetic energy

Abstract

The invention discloses a method for frequency control of a doubly-fed wind farm considering the optimal rotor inertial kinetic energy. The method is based on the proposed method for optimizing the rotating reserve capacity of a wind farm considering the rotor inertial kinetic energy, further adopts a linear control path with the overspeed and the pitch angle coordinated, and adjusts a droop coefficient by taking the sum of the rotor inertia kinetic energy and the pure mechanical load shedding capacity stored in each unit of the double-fed wind farm as the rotating reserve capacity, so that the rotor inertial kinetic energy can be fully utilized in the frequency droop control. The method of the invention can allow the double-fed wind farm to achieve substantially the same frequency modulation effect at a smaller wind curtailment cost as that at a conventional standby operation mode when a standby optimization operation mode is executed; and can allow the double-fed wind farm to obtaina better frequency modulation effect at the same wind curtailment conditions than in a conventional standby mode when a scheduling optimization operation mode is performed.

Description

technical field [0001] The invention relates to a doubly-fed wind farm frequency control method considering optimal rotor inertial kinetic energy, and belongs to the technical field of wind farm frequency control. Background technique [0002] Due to the characteristics of randomness, intermittency, and volatility of wind power output, as a large number of wind power is connected to the system, it is bound to increase the system's conventional frequency modulation reserve capacity requirements. The frequency stability problem faced by the system is becoming more and more serious. Many national grid departments have clearly stipulated that grid-connected wind farms need to participate in system frequency regulation. Therefore, it is of positive significance for both wind farm operators and system dispatching departments to seek to obtain the desired frequency modulation effect at a lower wind curtailment cost, or to obtain better frequency modulation effect under the same win...

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Problems solved by technology

[0003] The inventor has authorized the patent "A Method for Optimizing Rotating Reserve Capacity of Wind Farm Considering Rotor Inertial Kinetic Energy" and the inventor's published journal paper "Optimizing Method for Rotating Reserve Capacity of Wind Farm Considering Inertial Kinetic Energy" will be stored in each DFIG The inertial kinetic energy of the rotor in the wind turbine is included in the category of the wind farm’s rotating reserve capacity, and a backup optimal operation mode and a dispatch optimization operation mode are respectively proposed. More spinning reserve capacity can be provided in the operating mode; however, none of the above patents and journal papers has conducted further research on the frequency control method after the optimized spinning reserve capacity of the doubly-fed wind farm

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