Double-layer coordination control method for stabilizing wind power fluctuation of hybrid energy storage system

Abstract

The invention discloses a double-layer coordination control method for stabilizing wind power fluctuation of a hybrid energy storage system. The method comprises the following steps of (1) predicting short-term wind power through support vector machine regression, and optimizing penalty factor parameters through a crowd search optimization algorithm in a support vector machine regression prediction process; (2) taking the stabilized wind power as grid-connected reference power based on a W-M filtering method, calculating HESS reference output power, and performing primary power distribution on a supercapacitor and a storage battery by adopting improved Hilbert-Huang transform to obtain respective reference compensation power; (3) dividing the working areas of the supercapacitor and the storage battery by the system through a power optimization layer, and performing coordination control on the charge-discharge power and the SOC of the HESS by adopting a self-adaptive water injection algorithm to obtain expected compensation power; and (4) obtaining a final power set value by using an SH optimization algorithm by using an opportunity-constrained programming method with minimization as a target and maximum and minimum charging and discharging power values as constraints through a power implementation layer.

Description

technical field [0001] The invention relates to a control method of a hybrid energy storage system, in particular to a two-layer coordinated control method for the hybrid energy storage system to stabilize wind power fluctuations. Background technique [0002] As a clean and renewable energy with abundant reserves, wind energy is an effective way to solve the current energy crisis and environmental degradation. Wind power generation technology has attracted more and more attention from all over the world. Wind energy has strong random fluctuations, and the direct connection of wind power to the grid will have a negative impact on the safe and stable operation of the power system, and even cause grid collapse. With the increasing maturity of large-scale energy storage technology, installing a certain-capacity energy storage system in wind farms is an effective means to solve the problem of wind power grid-connected fluctuations. It is difficult for a single type of energy st...

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Problems solved by technology

Due to the limited capacity of the energy storage system, it may cause the SOC of the energy storage device to be limited or overcharge and overdischarge when stabilizing the fluctuation of wind power output power, thus failing to complete the stabilization task.

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