Energy accumulation converter-based active micro power grid seamless switching method under peer-to-peer control

An energy storage converter and seamless switching technology, which is applied in the field of power system, can solve the problems of the energy storage converter being prone to circulating current, the voltage amplitude sag coefficient is sensitive, and the consideration is insufficient, so as to overcome the energy storage converter. The effect of overload and continuous power supply

Inactive Publication Date: 2014-12-24
BEIJING SIFANG JIBAO AUTOMATION
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Problems solved by technology

[0009] The disadvantage is that when the grid-connected power is controlled, there is a problem of circulation between the energy storage converters
Due to insufficient consideration of factors such as line impedance and control parameters, the droop of the power outer ring of the gr

Method used

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  • Energy accumulation converter-based active micro power grid seamless switching method under peer-to-peer control
  • Energy accumulation converter-based active micro power grid seamless switching method under peer-to-peer control
  • Energy accumulation converter-based active micro power grid seamless switching method under peer-to-peer control

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Embodiment Construction

[0034] The technical solution of the present application will be further introduced in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] as attached image 3 Shown is the control flow chart of the seamless switching method of the active microgrid based on the energy storage converter in the peer-to-peer mode of the present invention, and the seamless switching method of the active microgrid based on the energy storage converter in the peer-to-peer mode of the present invention includes The following steps:

[0036] Step 1: When the microgrid and the grid are connected to the grid, use P / Q control for the microgrid, as shown in the attached Figure 4 as shown,

[0037] The grid-connected control method adopted in the present invention is traditional P / Q control, which has the advantages of stable control effect and simple control method.

[0038] Step 2: After receiving the instruction of the microgrid from grid-connected operation...

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Abstract

The invention relates to an energy accumulation converter-based active micro power grid seamless switching method under peer-to-peer control and belongs to the technical field of distributed generation micro power grids. The method is characterized in that a mode controller of a control layer is coordinated to perform mode switching, traditional P/Q current source control is used during grid connection, phase voltage amplitude/phase angle control based on a single voltage loop is used during grid disconnection, stable operation during grid connection and grid disconnection is achieved, easy control setting, few control links and fast dynamic response are achieved, and the problems that control manners of mode switching of existing micro power grids are basically the same, mode switching is sensitive to parameters, and control stability during grid connection and grid disconnection cannot be kept at the same time are solved. The method has the advantages that smooth switching of the operation states of the micro power grids is achieved, the output of an energy accumulation converter is smooth, continuous during switching, uninterrupted power is provided for loads and other distributed energy, and control strategies are good in universality.

Description

technical field [0001] The invention belongs to the field of power systems, and relates to a micro-grid control technology including distributed power sources, in particular to a method for seamless switching of active micro-grids based on energy storage converters under peer-to-peer control. Background technique [0002] In the construction of the current micro-grid, due to the demand for operating costs, the configured power of the general energy storage converter cannot cover all the load power in the micro-grid and the power of other distributed energy sources (such as photovoltaics, wind power, etc.). When switching, it is necessary to selectively remove some units in the microgrid according to the rated power of the energy storage converter, the state of charge of the energy storage element, the importance of the load, and the power generation state of the distributed energy source. That is, microgrids need to adjust loads and other distributed energy sources in the gr...

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Application Information

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IPC IPC(8): H02J3/32H02J3/46
Inventor 赵璐璐张效宇韩建陈建卫刘智全王立超操丰梅刘树
Owner BEIJING SIFANG JIBAO AUTOMATION
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