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Virtual synchronous power generation method and system based on inverter

A technology of virtual synchronous power generation and virtual synchronous motor, which is applied in the field of electric power, can solve problems such as difficult synchronization of grid-connected inverters and micro-grids, and achieve the effects of closed-loop control, stable power output, and improved stability

Inactive Publication Date: 2017-07-21
SHENZHEN SINEXCEL ELECTRIC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the embodiments of the present invention is to provide an inverter-based virtual synchronous power generation method and system, which overcomes the defect that conventional grid-connected inverters are difficult to synchronize with the microgrid in the prior art

Method used

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  • Virtual synchronous power generation method and system based on inverter
  • Virtual synchronous power generation method and system based on inverter
  • Virtual synchronous power generation method and system based on inverter

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no. 1 example

[0048] See figure 1 , is the flow chart of the first embodiment of the inverter-based synchronous power generation method provided by the present invention, and the method includes:

[0049] S11. Detect the current at the grid-connected point. Specifically, the inverter can be incorporated into the microgrid through inductance. Among them, the type of inverter includes but not limited to two-level inverter, three-level inverter and multi-level inverter, and the DC power supply in the inverter circuit includes but not limited to capacitor, super capacitor and battery . In this embodiment, the current at the grid-connected point can be obtained through the current detection device.

[0050]S12. Regulate the current according to a preset control link to generate a terminal voltage of the virtual synchronous generator. Specifically, some droop control strategies can be used to regulate the current at the grid-connected point to simulate the inertia and damping characteristics ...

no. 2 example

[0053] See figure 2 , is the flow chart of the second embodiment of the inverter-based synchronous power generation method provided by the present invention, the method includes:

[0054] S21. Obtain the current at the grid-connected point.

[0055] S22. Generate the electromagnetic torque of the virtual synchronous generator according to the current. Specifically, a virtual synchronous motor is assumed without a damper winding, and a constant current source is used instead of the field winding circuit. Step S22 may include: the current i at the grid-connected node a i b i c Perform abc-dq phase coordinate conversion to generate i d i q ; According to the first formula T e = 1.5pL m i f i q Calculate the electromagnetic torque T of the virtual synchronous generator e , where p is the number of pole pairs of the virtual synchronous motor, L m is the mutual inductance of the virtual synchronous motor, i f is the excitation current. For example, according to L m =...

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Abstract

The embodiment of the invention discloses a virtual synchronous power generation method and system based on an inverter, and the method comprises the steps: detecting a current at a grid connected point; carrying out the regulation and control of the current according to a preset control link, and generating an end voltage of a virtual synchronous power generator; generating a drive signal according to the end voltage of the virtual synchronous power generator, and controlling the on / off of a switching device in the inverter. According to the embodiment of the invention, the method achieves the closed-loop control of a system, can achieve the stable power output, and maintains the synchronization with a microgrid, and facilitates the improvement of the stability of a power grid.

Description

technical field [0001] The invention relates to the field of electric power, in particular to an inverter-based virtual synchronous power generation method and system. Background technique [0002] As the global energy crisis and environmental problems become increasingly prominent, distributed power generation technology and micro-grid technology have received more and more attention. As the link between distributed resources and distribution network (micro-grid), grid-connected inverters However, the challenges brought by the conventional control strategy itself to the safe and stable operation of the distribution network and microgrid cannot be ignored. In particular, conventional grid-connected inverters have fast response speed, almost no moment of inertia, and are difficult to participate in grid regulation. They cannot provide the necessary voltage and frequency support for active distribution networks with distributed The microgrid provides the necessary damping and...

Claims

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Application Information

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IPC IPC(8): H02J3/40
CPCH02J3/40
Inventor 冼成瑜
Owner SHENZHEN SINEXCEL ELECTRIC
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