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Off-grid and grid-connected smooth switching method of virtual synchronous generator

A technology of smooth switching and virtual synchronization, applied in the direction of single-network parallel feeding arrangement, electrical components, circuit devices, etc., can solve problems such as power grid impact, and achieve the effect of reducing inrush current, reducing impact, and small voltage change

Active Publication Date: 2017-09-29
STATE GRID QINGHAI ELECTRIC POWER +2
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  • Claims
  • Application Information

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Problems solved by technology

The grid-connected inverter based on the virtual synchronous generator control strategy is especially suitable for the connection between the energy storage device and the grid, but it also has the problem of impact on the grid from off-grid.

Method used

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  • Off-grid and grid-connected smooth switching method of virtual synchronous generator
  • Off-grid and grid-connected smooth switching method of virtual synchronous generator
  • Off-grid and grid-connected smooth switching method of virtual synchronous generator

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Embodiment Construction

[0028] In order to better understand the present invention, the content of the present invention is further illustrated below in conjunction with the examples, but the content of the present invention is not limited to the following examples. Those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms are also within the scope of the claims listed in this application.

[0029] The present invention provides a method for smooth switching of virtual synchronous generators from and to the grid. The topology of an actual virtual synchronous generator is as follows figure 1 As shown, the present invention mainly studies the off-grid switching method of the virtual synchronous generator. The method for smooth switching of the virtual synchronous generator from and to the grid is as follows: figure 2 As shown, when the virtual synchronous generator runs off-grid, the voltage regulation link of the virtual synchronous gener...

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Abstract

The invention provides an off-grid and grid-connected smooth switching method of a virtual synchronous generator. The smooth switching method is characterized by comprising grid-connected / off-grid and off-grid / grid-connected smooth switching. As for off-grid / grid-connected switching, the switching strategy is added in the off-grid and grid-connected switching process without modifying the control strategy of the virtual synchronous generator, and the reference voltage of the virtual synchronous generator is changed into the command reference voltage from the grid voltage and the correction angular velocity of pre-synchronous control is enabled to be zero directly so as to realize grid-connected / off-grid smooth switching. Popularization of the virtual synchronous generator technology is further facilitated in the field of new energy power generation, and friendly accessing of distributed energy resources can be realized so as to enhance the stability of the electric power system. Besides, application of the control strategy and the theoretical analysis method related to the conventional synchronous generator to VSG is facilitated so as to play an important role in the active power distribution network and the microgrid in the future.

Description

technical field [0001] The invention relates to the technical field of new energy power generation, in particular to a method for smooth switching of a virtual synchronous generator from grid to grid. Background technique [0002] With the global energy crisis and environmental pollution becoming more and more serious, clean energy such as solar energy and wind energy has received more and more attention. While vigorously developing distributed energy, the problems of distributed energy when connected to the grid have also attracted the attention of experts and scholars. Generally, the utilization of distributed energy is mainly connected to the grid through inverters. Compared with traditional synchronous generators, grid-connected inverters have a faster response speed, lack of moment of inertia and damping, and are not convenient for grid adjustment. Furthermore, the control methods of grid-connected inverters are different, and coupled with the influence of the instabil...

Claims

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Application Information

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IPC IPC(8): H02J3/38
CPCH02J3/381H02J3/388
Inventor 李春来贾枬张节潭李正曦陶以彬杨立滨李官军宋锐杨波杨军周晨赵世昌华光辉孟可风汪春王轩余豪杰杨嘉胡安平王学斌冯鑫振刘欢曹远志崔红芬庄俊鄢盛驰
Owner STATE GRID QINGHAI ELECTRIC POWER
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