Capacity configuration method of flywheel energy storage system for electric vehicle DC fast charging stations

Abstract

The invention relates to a capacity configuration method of a flywheel energy storage system for electric vehicle DC fast charging stations, which comprises the following steps: obtaining the currentrated load power of an electric vehicle DC fast charging station; calculating the maximum allowable drop amplitude delta(vdc)-max of the bus voltage and the maximum climbing rate kGrid of the grid power corresponding to the load according to the rated load power; obtaining the ratio coefficient Dv / omega between the maximum drop amplitude of the voltage and the drop amplitude of the mechanical angular velocity according to the control strategy parameters of the DC fast charging station; calculating the reference values of rotational inertia and mechanical angular velocity of the flywheel in theflywheel energy storage system according to the parameters and a source-storage-load power characteristic curve; and inputting the reference values of rotational inertia and mechanical angular velocity of the flywheel to the control system of the flywheel energy storage system to configure the capacity of the flywheel energy storage system. Compared with the prior art, the capacity of the flywheel energy storage system can be configured with pertinence and accuracy.

Description

technical field [0001] The invention relates to a DC fast charging station for electric vehicles, in particular to a method for configuring the capacity of a flywheel energy storage system used in a DC fast charging station for electric vehicles. Background technique [0002] With the popularization of electric vehicle fast charging technology, more and more electric vehicle fast charging stations are put into construction and operation in the core areas of cities. The fast charging station load has the characteristics of large power and strong randomness, which can lead to a sharp increase in power grid power and cause a strong impact on the power system. The configuration of flywheel energy storage in the DC fast charging station can effectively alleviate the power impact of the grid and compensate for the bus voltage drop. [0003] However, the existing flywheel energy storage system of DC fast charging station has the following problems: the energy storage capacity of t...

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Problems solved by technology

[0003] However, the existing flywheel energy storage system of DC fast charging station has the following problems: the energy storage capacity of the flywheel energy storage system is large, and the empirical method cannot be used for accurate configuration, resulting in too large or too small capacity

Most of the existing studies have not combined its energy storage characteristics when configuring the capacity of the flywheel energy storage system, and have not conducted detailed research on the basic parameters of the flywheel energy storage flywheel rotor moment of inertia and the initial mechanical angular velocity.

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