Adaptive inertia damping comprehensive control method for virtual synchronous generator

A technology of virtual synchronization and comprehensive control, applied in the direction of reducing/preventing power oscillation, etc., can solve problems such as ignoring frequency stability, achieve the effect of improving frequency stability, reducing frequency overshoot, and shortening frequency adjustment time

Inactive Publication Date: 2018-03-27
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Abstract
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Problems solved by technology

However, they considered the virtual moment of inertia, but often ignored the effect o...

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  • Adaptive inertia damping comprehensive control method for virtual synchronous generator
  • Adaptive inertia damping comprehensive control method for virtual synchronous generator
  • Adaptive inertia damping comprehensive control method for virtual synchronous generator

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Embodiment 1

[0033] figure 1 Shown is the schematic diagram of the structure of the virtual synchronous generator in this embodiment, the voltage source type three-phase full-bridge topology is selected as the carrier of the virtual synchronous generator, and the parameters of the LC filter in the circuit are set: the cut-off frequency is the switching frequency One-tenth to one-fifth, and requires a fundamental frequency higher than ten times; the inductor current ripple generally does not exceed 10% of the rated current; the reactive power generated by the limiting capacitor generally does not exceed the rated power of the system 5%.

[0034] In the following, through the analysis of the characteristics of the synchronous generator model, the mechanics principle is used to study the mechanism of the synchronous generator model, and the basis for the adaptive change of the virtual moment of inertia after the disturbance is obtained. Without special circumstances, the generator rotor is a...

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Abstract

The invention relates to an adaptive inertia damping comprehensive control method for a virtual synchronous generator. The frequency fluctuation cycle after the traditional virtual synchronous generator is disturbed is segmented to four intervals, and adaptive inertia damping comprehensive control based on the segmentation is realized. The virtual inertia is increased adaptively within the first interval and the third interval with frequency disturbance, and in the rest intervals, the initial virtual inertia values are kept unchanged; and the virtual damping is increased adaptively within thesecond interval and the fourth interval, and in the rest intervals, the initial virtual damping values are kept unchanged. Compared with the prior art, the method of the invention realizes interleaving control on the virtual rotating inertia and the virtual damping, the problem of frequency stability after disturbance of the virtual synchronous generator grid-connected system can be effectively improved, and the frequency adjustment time is shortened while the frequency overshoot is reduced.

Description

technical field [0001] The invention relates to the technical field of virtual synchronous generators, in particular to an adaptive inertia damping comprehensive control method for virtual synchronous generators. Background technique [0002] With the depletion of traditional energy, distributed generation (Distributed Generation, DG) with new energy as the main body is gradually emerging. When most distributed energy sources are connected to the grid, grid-connected inverters are required as interfaces, and inverters as power electronic devices often have disadvantages such as poor overload capacity, small output impedance, and almost no inertia. [0003] In traditional power systems, large synchronous generators are often used as the main power source. Due to the inertia of the rotor of the synchronous generator, when there is a sudden load change in the power system or the generator trips, the synchronous generator in normal operation will slowly make up for the power de...

Claims

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Application Information

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IPC IPC(8): H02J3/24
CPCH02J3/24
Inventor 李东东朱钱唯赵耀刘庆飞杨帆
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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