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An Adaptive Virtual Inertia Control Method Based on Frequency Prediction

A virtual inertia and frequency prediction technology, applied in the field of power system, can solve the problem that the inverter cannot give full play to the inertia effect, and achieve the effect of reducing the overshoot and adjustment time, and improving the dynamic performance.

Active Publication Date: 2022-07-05
NINGBO ELECTRIC POWER DESIGN INST
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Problems solved by technology

However, the conventional VSG cannot cope with various complex working conditions, and its structure or parameter setting needs to be improved
The virtual inertia coefficient is an important parameter in the VSG active loop. Properly increasing the virtual inertia can suppress the oscillation of active power and frequency, but the size of the virtual inertia is limited by the inverter capacity and the rated frequency change, and the inverter cannot fully utilize Inertia effect

Method used

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  • An Adaptive Virtual Inertia Control Method Based on Frequency Prediction
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  • An Adaptive Virtual Inertia Control Method Based on Frequency Prediction

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[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0031] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the application. Unless otherwise defined, 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.

[0032] It should be noted that the terminology used herein is for the purpose of describing specific embodiments only, and is not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural as well, furthermore, it is to be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates that There are features, steps, operations, devices, components and / ...

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Abstract

The invention relates to an adaptive virtual inertia control method based on frequency prediction, comprising the following steps: Step S1: Designing a minimum virtual inertia value according to a system damping ratio requirement J min ; Step S2: Design the virtual inertia maximum value according to the predicted frequency maximum deviation J max ; Step S3: Based on the minimum and maximum values ​​of the virtual inertia, an adaptive virtual inertia control method is proposed. When the product of frequency deviation and frequency change rate has the same sign, J Take the maximum value; when the product of frequency deviation and frequency change rate has different signs, J Take the minimum value. The invention is based on the virtual synchronous generator control structure, based on the predicted maximum frequency deviation, under the premise that the output power of the inverter does not exceed the rated capacity, and the advantage that the inverter parameters can be adjusted in real time is used to increase the setting of the virtual inertia. interval, thereby improving the recovery effect of the system frequency and output power after being disturbed.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to an adaptive virtual inertia control method based on frequency prediction. Background technique [0002] With the increasing global energy crisis and environmental problems, the coverage of distributed generation systems based on renewable energy is increasing. However, compared with synchronous generators, grid-connected inverters lack inertia and damping characteristics as the hub connecting distributed energy sources to the grid. Therefore, a virtual synchronous generator (VSG) control strategy is proposed. By adding the motion equation of the rotor to the inverter control algorithm, the inertia of the system is increased, and the system's ability to support frequency and voltage is improved. However, the conventional VSG cannot cope with various complex working conditions, and its structure or parameter setting needs to be improved. The virtual inertia coefficient is a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00H02J3/38
CPCH02J3/00H02J3/381H02J2203/10Y02E10/76
Inventor 高飞翎周勋甜李敏敏王丽鹏李弘毅蔡东辉应磊张志刚叶梁恒
Owner NINGBO ELECTRIC POWER DESIGN INST
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