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Damping coefficient quantitative identification method, system and device for virtual synchronous generator

A technology of virtual synchronous motor and damping coefficient, which is applied in the direction of circuit devices, electrical components, AC network circuits, etc., to achieve the effect of optimizing grid-connected performance

Active Publication Date: 2019-08-06
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problem of how to correctly identify the damping coefficient D in the prior art, the object of the present invention is to provide a method, system and device for quantitatively identifying the damping coefficient of a virtual synchronous generator, so that the damping coefficient D can be correctly identified after setting Quantitative identification

Method used

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  • Damping coefficient quantitative identification method, system and device for virtual synchronous generator
  • Damping coefficient quantitative identification method, system and device for virtual synchronous generator
  • Damping coefficient quantitative identification method, system and device for virtual synchronous generator

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Embodiment 1

[0065] The present invention provides a method for quantitatively identifying the damping coefficient of a virtual synchronous generator, the flow chart of which is as follows figure 1 As shown, the method may include:

[0066] S11. Obtaining the voltage and current of the virtual synchronous motor before and after the frequency change;

[0067] S12. Calculate the damping coefficient of the virtual synchronous generator according to the voltage and current of the virtual synchronous motor before and after the frequency change, and based on a pre-established expression for quantitative identification of the damping coefficient.

[0068] In step S11, the virtual synchronous generator simulates the operating mechanism and external characteristics of the traditional synchronous motor through the inverter control algorithm, so that the inverter power supply has inertia response and damping characteristics, and provides frequency and voltage support for the stable operation of the s...

Embodiment 2

[0084] In order to quantitatively identify and obtain the damping coefficient, further experiments are needed to collect the voltage and current of the VSG before and after the frequency change.

[0085] with attached figure 2 The grid simulation device shown provides conditions for the test to be carried out, including: a grid simulation device and an acquisition device; the acquisition device is arranged between the grid simulation device and the virtual synchronous generator, and the virtual synchronous generator passes through The power grid simulation device is connected to the power grid; the collection device includes a voltage transformer and a current transformer; the voltage transformer is used to collect the voltage of the virtual synchronous generator; the current transformer is used to collect the current of the virtual synchronous generator;

[0086] The power grid simulation device includes: a step-down transformer, a rectifier, an inverter, an inverter control...

Embodiment 3

[0093] Based on the same inventive concept, the present invention also provides a quantitative identification system for the damping coefficient of a virtual synchronous generator, including:

[0094] Establishing a module for pre-establishing the expression of the quantitative identification of the damping coefficient;

[0095] The obtaining module is used to obtain the voltage and current of the virtual synchronous motor before and after the frequency change;

[0096] The calculation module is used to calculate the damping coefficient of the virtual synchronous generator based on the pre-established quantitative identification expression of the damping coefficient according to the voltage and current of the virtual synchronous motor before and after the frequency change.

[0097] Further: the building module includes:

[0098] The determination unit is used to determine the rotor motion equation of the virtual synchronous motor, and at the same time use the micro power inve...

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Abstract

The invention relates to a damping coefficient quantitative identification method and system for a virtual synchronous generator. The method comprises the steps of acquiring the voltages and the currents of the virtual synchronous generator before and after a frequency change; and calculating the damping coefficient of the virtual synchronous generator according to the voltages and the currents ofthe virtual synchronous generator before and after the frequency change and based on a pre-established damping coefficient quantitative identification expression. The method enables the correct quantitative identification of the set damping coefficient D.

Description

technical field [0001] The invention relates to new energy access and control technology, in particular to a method, system and device for quantitatively identifying the damping coefficient of a virtual synchronous generator. Background technique [0002] Unlike traditional energy sources that are mostly connected to the grid through synchronous generators, more and more distributed power sources are connected to the grid through power electronic grid-connected inverters. Compared with traditional synchronous generators, distributed power grid-connected inverters The transformer has the advantage of quick response, but because it is a static device, it cannot provide sufficient damping coefficient D for the grid. With the increasing penetration of distributed power, it will seriously affect the dynamic response and stability of the power system. . [0003] At present, the concept of virtual synchronous generator (Virtual Synchronous Generator, VSG) is proposed. The main id...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/381H02J2203/20
Inventor 代林旺秦世耀王瑞明李少林张利陈晨孙勇于雪松
Owner CHINA ELECTRIC POWER RES INST
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