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A control method and system based on a virtual synchronous generator

A technology of virtual synchronization and control method, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as bridge arm voltage phase offset, achieve amplitude synchronization, and achieve the effect of grid voltage phase

Active Publication Date: 2020-04-28
XJ ELECTRIC +2
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a control method and system based on a virtual synchronous generator to solve the problem that the VSG output voltage phase and the bridge arm voltage phase are easily shifted due to the effect of the LC / LCL filter

Method used

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  • A control method and system based on a virtual synchronous generator
  • A control method and system based on a virtual synchronous generator
  • A control method and system based on a virtual synchronous generator

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Embodiment Construction

[0035] In order to realize the compensation for the phase shift of the LC / LCL filter, the present invention provides a control system based on a virtual synchronous generator. The control block diagram of the system is as follows figure 1 shown.

[0036] The system includes two phase-locked loops, one is a virtual synchronous generator synchronous phase-locked loop, and the other is a grid voltage synchronous phase-locked loop. The amplitude synchronization value u of the synchronous phase-locked loop output of the virtual synchronous generator syn Superimposed to the excitation controller, the frequency adjustment ω of the grid voltage synchronous phase-locked loop output syn superimposed to the power frequency controller.

[0037] The excitation controller includes a reactive power control loop and a voltage control loop, and the power frequency controller includes an active power control loop and a frequency control loop.

[0038] The output of the excitation controller ...

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Abstract

The invention relates to a control method and system based on a virtual synchronous generator. In the grid-connected pre-synchronization stage, phase-locked loop control is performed on grid voltage to obtain a grid voltage amplitude; the phase-locked loop control is conducted on the terminal voltage of a virtual synchronous generator, and the amplitude of the terminal voltage is obtained; the grid voltage amplitude is taken as a given value, the terminal voltage amplitude is taken as a feedback value, closed-loop control is conducted, the amplitude synchronization amount is obtained, and theamplitude synchronization amount is superimposed on a voltage control loop of an excitation controller. When the phase-locked loop control is performed on the grid voltage, the frequency adjustment amount is obtained, and the frequency adjustment amount is superimposed on a power frequency controller. The method adaptively compensates the deviation of bridge arm voltage phase and terminal voltagephase caused by an LC / LCL filter, thereby achieving the synchronization of the terminal voltage phase and the grid voltage phase and amplitude synchronization.

Description

technical field [0001] The invention belongs to the technical field of grid connection of new energy power generation, and in particular relates to a control method and system based on a virtual synchronous generator. Background technique [0002] As the global energy crisis and environmental problems become increasingly prominent, the installed capacity of intermittent energy represented by photovoltaics and wind power accounts for an increasing proportion of the total installed capacity. However, the large output of intermittent energy sources and the random fluctuation of frequency have an impact on the active power balance of the system and affect the frequency modulation characteristics of the system. Different from the rotating motors in conventional power plants, the intermittent energy connected to the power grid through power electronic equipment is a non-rotating stationary component, which does not have the moment of inertia of conventional units, and its large-sc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/40
CPCH02J3/388H02J3/40H02J2203/20
Inventor 魏亚龙姚为正王林张海龙赵建荣肖飞陈雪马贝龙
Owner XJ ELECTRIC
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