FREQUENCY CONTROL METHOD AND SYSTEM DURING USING WIND FARM AS BLACK-START POWER SOURCE BY MEANS OF OPTIMAL CONFIGURATION OF ENERGY STORAGE

摘要

The present disclosure provides a frequency control method and system during using a wind farm as a black-start power source by means of optimal configuration of energy storage. An energy storage configuration method comprises: first determining a wind farm to be used as a black-start power source and a unit to be started, and respectively collecting energy storage power configuration and capacity configuration sample data; fitting a joint probability distribution function of energy storage power and capacity configurations on the basis of an asymmetric Copula function, and solving chance constrained programming to obtain an energy storage configuration scheme, so that the wind farm has the ability to act as a black-start power source. A frequency control method comprises: when starting power plant auxiliaries, using virtual inertia control to make a wind storage system show inertial characteristics similar to those of a synchronous generator; obtaining a system frequency deviation predicted value by means of a prediction model; correcting the system frequency deviation predicted value according to feedback from an error coefficient matrix; selecting a frequency control mode or a standby recovery mode according to the system frequency deviation corrected value; online calculating wind farm layer optimization and wind turbine layer optimization for different control modes; and applying an optimal control sequence to a wind farm, a wind turbine, and an energy storage control system. By means of the proposed energy storage configuration and frequency control methods, the wind farm can be used as a black-start power source to start a thermal power unit, thereby accelerating the recovery speed of regional power grids having a high proportion of wind power integration after a power outage.