Power control method and control device for accessing flywheel energy storage system to AC power grid

Abstract

The invention provides a power control method and device for accessing a flywheel energy storage system to an AC power grid. The method comprises the steps of: obtaining the actual operation power of a grid-connected side converter when a flywheel energy storage system responds to a set power; performing power closed-loop control according to the set power and the actual operation power to obtain a first output value; calculating a target voltage value of a DC bus according to the corresponding voltage value of the flywheel energy storage system in a preset working state and the first output value, and performing voltage closed-loop control according to the target voltage value of the DC bus and a voltage feedback value of the DC bus to obtain a second output value; and calculating a target current value according to the second output value and the maximum current value of the grid-connected side converter, so as to enable the operation current of the grid-connected side converter to be the target current value. According to the invention, the problem that the operation power deviates from a required value due to the adoption of a control mode of responding to the DC network voltage under the application scene in which a DC network voltage response type flywheel energy storage system is connected to an AC power grid can be solved.

Description

technical field [0001] The invention relates to the technical field of flywheel energy storage, in particular to a power control method and a control device for connecting a flywheel energy storage system to an AC grid. Background technique [0002] The flywheel energy storage system with DC side grid-connection capability can well solve the needs of DC grid-connection and energy storage and energy saving in rail transit and other industries. After the flywheel energy storage system is connected to the DC bus, the operating power is adjusted by responding to the DC network voltage: when the DC network voltage is greater than a preset threshold, the flywheel energy storage system is charged, and the charging power increases with the continuous increase of the bus voltage , to stabilize the DC network voltage. When the DC network voltage is less than another threshold, the flywheel energy storage system discharges to provide power support to the DC network, and the power incre...

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a power control method and a control device for connecting a flywheel energy storage system to an AC grid, which can solve the problem of using a responsive DC grid in the application scenario where a DC grid voltage-responsive flywheel energy storage system is connected to an AC grid. The problem that the operating power deviates from the demand value caused by the pressure control method

Images