A grid-connected control method and system suitable for a flywheel energy storage device

Abstract

The invention discloses a grid-connected control method and system suitable for a flywheel energy storage device, which belongs to the technical field of electrical engineering. The voltage control module provided by the invention makes the actual voltage of the DC side follow the preset value of the DC side voltage, and obtains the flywheel side q Axis current reference value; the current control module makes the d-axis output current and q-axis output current of the flywheel side follow the d-axis current reference value and q-axis current reference value of the flywheel side respectively, and obtains the d-axis voltage reference value and q-axis voltage reference value of the flywheel side ; The actual physical quantity of the circuit can track the reference value of the controller very well, so that the grid-connected system has good response characteristics; the frequency-active power control equation and voltage-reactive power control equation constructed by the grid side control unit can quickly respond to the grid frequency and voltage changes; the invention solves the technical problem that the existing grid-connected device cannot use the flywheel energy storage device to quickly respond to changes in the grid for voltage regulation and frequency regulation.

Description

technical field [0001] The invention belongs to the technical field of electrical engineering, and more specifically relates to a grid-connected control method and system suitable for a flywheel energy storage device. Background technique [0002] In recent years, with the large-scale application of new power generation technologies such as wind power and solar power, the dominant position of synchronous generators on the power generation side has been gradually shaken. The interface of the power generation unit connected to the power grid, its fast response characteristics and the randomness and intermittency of the new power generation unit have brought large fluctuations to the power grid, significantly reducing the inertia of the system, and affecting the safe and stable operation of the system. The energy storage device can rely on the fast response characteristics of the converter and adopt appropriate control methods to stabilize the fluctuation of renewable energy, s...

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Problems solved by technology

[0005] In view of the defects of the prior art, the purpose of the present invention is to provide a grid-connected control method and system suitable for flywheel energy storage devices, aiming at solving the problem that existing grid-connected devices cannot use flywheel energy storage devices to quickly respond to grid changes for voltage regulation and frequency regulation technical issues

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