Control method for virtual rotational inertia and damping adjustment of network-forming converter

A technology of moment of inertia and control method, applied in AC network circuit, single-network parallel feeding arrangement, reducing/preventing power oscillation, etc. sexual effect

Pending Publication Date: 2022-05-13
STATE GRID ZHEJIANG ELECTRIC POWER COMPANY TAIZHOU POWER SUPPLY
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Problems solved by technology

The existing literature shows that the virtual moment of inertia mainly affects the overshoot of the system frequency, and the damping coefficient mainly affects the attenuation rate of the frequency. However, most traditional VSM technologies use a trial and error method to select control parameters, which is difficult to deal with complex and changeable disturbances in practical applications. influences

Method used

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  • Control method for virtual rotational inertia and damping adjustment of network-forming converter
  • Control method for virtual rotational inertia and damping adjustment of network-forming converter
  • Control method for virtual rotational inertia and damping adjustment of network-forming converter

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Embodiment Construction

[0032] In order to make the structure and advantages of the present application clearer, the structure of the present application will be further described below in conjunction with the accompanying drawings.

[0033] Therefore, this paper takes the power electronic equipment networking system as the research object, adopts VSM technology for the grid-type converter, proposes an adaptive algorithm through the system frequency change rate, and flexibly adjusts the damping coefficient D p and the virtual moment of inertia J to further improve the frequency support capability of the system while ensuring the stability of the system.

[0034] The symbols in the figure and text are: SM stands for synchronous generator, DC / AC stands for converter, VSM stands for virtual synchronous machine control technology, df / dt stands for frequency change rate, C 1 and C 2 is the critical value of the given frequency change rate, D p is the damping coefficient, D p0 is the given value of the ...

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Abstract

The invention provides a control method for virtual rotational inertia and damping adjustment of a network construction type current converter, aims to improve the stability and frequency supporting capacity of a power electronic new energy power system, and adopts the technical scheme that a virtual synchronous machine control technology is adopted for the current converter for a power electronic networking system; according to the system frequency change rate, an adaptive adjustment relation is provided, a damping coefficient Dp and a virtual rotational inertia J in VSM control are flexibly adjusted, and when active load fluctuation occurs, system stability is ensured and frequency support is provided.

Description

technical field [0001] The application belongs to the field of equipment control, and in particular relates to a control method for virtual moment of inertia and damping adjustment of a grid-type converter. Background technique [0002] As energy and environmental issues become increasingly prominent, in the context of energy structure transformation and the construction of new power systems, new energy power generation technologies based on photovoltaics and wind power are developing rapidly. With the maturity of technologies, a high proportion of new energy access The power system makes the new power system tend to power electronics. [0003] Compared with the traditional power system, the power electronic system dominated by the converter leads to a lower level of system inertia damping. When active load fluctuations occur, how does the low inertia and weak damping power system ensure frequency stability and power and voltage characteristics? It has good research signifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/24
CPCH02J3/38H02J3/241
Inventor 叶琳郭锋王林童邹宏亮夏敏燕倪晓军丁春燕王天群
Owner STATE GRID ZHEJIANG ELECTRIC POWER COMPANY TAIZHOU POWER SUPPLY
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