Control method for improving discharge depth of flywheel energy storage device under microgrid

A technology of flywheel energy storage and depth of discharge, applied in the field of control, can solve the problems of insufficient depth of discharge, reduced flywheel economy, low depth of discharge, etc., to save floor space and device weight, increase capacity utilization, and improve depth of discharge. Effect

Active Publication Date: 2019-06-11
SHANDONG UNIV
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Problems solved by technology

[0005] The problem with the existing flywheel system discharge control strategy is that the discharge depth is not considered and there is a problem of insufficient discharge depth. The specific performance is that the output voltage cannot be maintained when the flywheel speed drops to half.
Low depth of discharge will lead to a decrease in flywheel economy and lower cost performance

Method used

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  • Control method for improving discharge depth of flywheel energy storage device under microgrid
  • Control method for improving discharge depth of flywheel energy storage device under microgrid
  • Control method for improving discharge depth of flywheel energy storage device under microgrid

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[0043] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0044] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.

[0045] About the mathematical model of the flywheel motor: Most of the flywheel motors in practical applications...

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Abstract

The invention discloses a control method for improving discharging depth of a flywheel energy storage device under a microgrid. The control method comprises the following steps of selecting a mathematic model of a flywheel motor accessed to the microgrid; simplifying a rotational speed of the flywheel motor and an output voltage of the flywheel motor as a direct proportion relation, wherein a proportion coefficient is set as k; obtaining an output voltage, after being rectified, of the flywheel motor according to the proportion coefficient and the rotational speed of the flywheel motor, namely, an input voltage U<in> of a Cuk circuit; obtaining an output voltage U<o> after voltage conversion on the input voltage of the Cuk circuit by the Cuk circuit; obtaining an expression of a control signal u of a pulse width modulation (PWM) controller according to a running principle of the PWM generator for generating the control signal, the input voltage U<in> of the Cuk circuit and the output voltage U<o> after voltage conversion of the Cuk circuit; and finally, adding a proportion integration differentiation (PID) control module. By rotational speed tracking of the flywheel motor and combined control of PID, deep discharging of flywheel energy storage can be ensured, and rapid response and stable voltage of flywheel energy storage can also be ensured.

Description

technical field [0001] The invention relates to the technical field of control, in particular to improving the discharge depth of a flywheel energy storage device under a microgrid. Background technique [0002] Due to the rapid development of micro-grids, the development and utilization of large-scale new energy power generation resources have been realized, as well as the electrification of remote mountainous islands and mobile vehicles. As a small-scale power grid, microgrid has large fluctuations and uncertainties in both power generation and load. Access to energy storage regulation is an effective countermeasure, which is more reliable, faster and more economical than traditional measures such as primary frequency regulation and secondary frequency regulation. [0003] Flywheel energy storage, as an energy storage device that relies on the rotational kinetic energy of the flywheel to store energy, has the dual advantages of high power density and high energy density, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/30
CPCY02E60/16
Inventor 梁军李和丰贠志皓张峰
Owner SHANDONG UNIV
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