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Virtual synchronous machine control method based on sine amplitude integral method feed-forward quantity extraction

A technology of virtual synchronous machine and control method, which is applied in the flicker reduction of AC network, AC network to reduce harmonic/ripple, reduce/prevent power oscillation, etc., can solve problems such as deteriorating power grid quality, current distortion, power fluctuation, etc. , to achieve the effect of simple control structure, reducing oscillation and improving adaptability

Pending Publication Date: 2022-03-01
STATE GRID SHANXI ELECTRIC POWER COMPANY CHANGZHIELECTRIC POWER SUPPLY
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Problems solved by technology

Conventional VSG control schemes are based on symmetrical grid voltages, aiming at actual grid conditions such as asymmetrical three-phase grid voltages and harmonics in the grid, which will lead to problems such as current distortion and power fluctuations, further deteriorating the quality of the grid

Method used

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  • Virtual synchronous machine control method based on sine amplitude integral method feed-forward quantity extraction
  • Virtual synchronous machine control method based on sine amplitude integral method feed-forward quantity extraction
  • Virtual synchronous machine control method based on sine amplitude integral method feed-forward quantity extraction

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Embodiment Construction

[0032] Attached below Figure 1-6 The present invention is further described. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0033] Such as figure 1 As shown, the VSG link is based on the second-order equivalent model of the synchronous generator, combined with the rotor motion equation and the stator electrical equation, the model of the mechanical part and the electromagnetic part of the virtual synchronous machine is as follows:

[0034]

[0035] Among them, v represents the terminal voltage, e represents the induced electromotive force, i represents the stator armature current, r represents the armature resistance of the stator winding, L represents the self-inductance of the motor stator winding, M f Indicates the maximum value of the mutual inductance between the rotors, i f Indicates the excitation current of the rotor, θ indicates th...

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Abstract

The invention belongs to the technical field of distributed energy converters and particularly relates to a virtual synchronous generator control method based on sine amplitude integral method feed-forward extraction. The virtual synchronous generator control method based on sine amplitude integral method feed-forward extraction belongs to the technical field of distributed energy converters. Comprising a VSG link, an SAI link and a feedforward link. The VSG link provides a regulation and control thought that a grid-connected inverter simulates a synchronous generator, the operation performance equivalent to that of a conventional synchronous generator is achieved through a control strategy, and the control characteristic under the condition that new energy is connected to a power grid is improved. The SAI link extracts the negative sequence and harmonic components of the power grid in real time; in the feed-forward link, according to the negative sequence and harmonic components of the power grid voltage provided by the SAI link, feed-forward is added into a controller, so that suppression of grid-connected harmonic waves is realized, and the negative sequence component and the harmonic components of the power grid voltage are completely counteracted by the VSG under the non-ideal power grid voltage; the control method can inhibit the current harmonic waves under different power grid working conditions.

Description

technical field [0001] The invention belongs to the technical field of distributed energy converters based on a virtual synchronous generator control method based on a sinusoidal amplitude integral method for extracting feedforward quantities, and in particular relates to a virtual synchronous generator control method based on a sinusoidal amplitude integral method for extracting feedforward quantities . Background technique [0002] At present, the application of new energy such as photovoltaic and wind power is becoming more and more extensive, and the proportion of its power generation in the power grid is also increasing year by year. Because the new energy power generation system is affected by the external environment, its output has certain randomness and volatility, and a large number of new energy grid connection brings challenges to the stable operation of the power grid. The inertia and damping of the distributed power generation system of the converter are small...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/24H02J3/26H02J3/01
CPCH02J3/38H02J3/24H02J3/26H02J3/01H02J3/002H02J2203/20Y02E40/40Y02E40/50
Inventor 王晓东王宪萍杨林涛王婵琼王红斌倪喜军
Owner STATE GRID SHANXI ELECTRIC POWER COMPANY CHANGZHIELECTRIC POWER SUPPLY
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