Off-grid and grid-connection control method and system for virtual synchronous generator

A technology of virtual synchronization and control method, which is applied in the direction of single-network parallel feeding arrangement, etc., and can solve problems such as the inability to realize stable and seamless switching between grid-connected and off-grid

Active Publication Date: 2015-12-30
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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  • Application Information

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Problems solved by technology

[0004] Based on this, it is necessary to provide an off-grid/grid-connected virtual synchronous generator that can enable stable switching between grid-connect...

Method used

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  • Off-grid and grid-connection control method and system for virtual synchronous generator
  • Off-grid and grid-connection control method and system for virtual synchronous generator
  • Off-grid and grid-connection control method and system for virtual synchronous generator

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Embodiment Construction

[0025] see figure 1 , providing an embodiment of an off-grid / grid-connected switching control method applied to a virtual synchronous generator, including the following steps:

[0026] S100: Establishing mechanical equations and electromagnetic equations of the virtual synchronous generator.

[0027] Using the mechanical and electromagnetic equations of the virtual synchronous generator to control the virtual synchronous generator is based on the fact that the grid-connected inverter of the virtual synchronous generator has the same external characteristics as the traditional synchronous generator. The mechanical equation and the electromagnetic equation are established, that is, the virtual Mathematical model of a synchronous generator. Using virtual synchronous generator technology, the traditional synchronous generator electromagnetic equation is used to control the grid-connected inverter, that is, the traditional synchronous generator electromagnetic equation is used to ...

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Abstract

The invention relates to an off-grid and grid-connection control method and system for a virtual synchronous generator. A voltage error is calculated through a difference value between the grid voltage and the generator terminal voltage of the virtual synchronous generator, an electromagnetic equation and uncertain factor items; a sliding mode surface is designed according to the difference value between the grid voltage and the generator terminal voltage of the virtual synchronous generator and the voltage error; the difference value between the generator terminal voltage of the virtual synchronous generator and the grid voltage is controlled to be decreased according to the voltage error and the sliding mode surface through a fast terminal sliding mode control algorithm; when the voltage error is within a preset off-grid and grid-connection switching error range, off-grid and grid-connection switching is performed on the virtual synchronous generator. According to the off-grid and grid-connection control method and system for the virtual synchronous generator, due to the fact that when off-grid and grid-connection switching is performed on a generator terminal of the virtual synchronous generator, the generator terminal voltage of the virtual synchronous generator and the grid voltage are basically synchronous and a large impact current cannot be generated, the virtual synchronous generator can achieve seamless switching.

Description

technical field [0001] The invention relates to the field of electrical control, in particular to an off-grid control method and system applied to a virtual synchronous generator. Background technique [0002] As the world's energy problems become increasingly prominent, more and more attention has been paid to distributed power sources and microgrids. Most of the output of the microgrid is DC, so it needs to be connected to the distribution network through a grid-connected inverter, but the conventional control strategy brings challenges to the safe and stable operation of the distribution network and the microgrid. The microgrid inverter using virtual synchronous generator technology is called virtual synchronous generator. The virtual synchronous generator (VirtualSynchronousGenerator, VSG) needs to run in two modes, grid-connected and off-grid parallel operation. [0003] Different from traditional synchronous generators, the microgrid has two operating modes: off-grid...

Claims

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Application Information

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IPC IPC(8): H02J3/38
Inventor 唐酿盛超孙闻金杨翁洪杰肖湘宁袁敞陈锐张俊峰朱良合罗运松张毅超吴晓宇刘正富安然然赵艳军
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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