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Grid-connection and off-grid seamless switching control method for energy storage inverter

An energy storage inverter and seamless switching technology, which is applied in the direction of AC network circuits, single-network parallel feeding arrangements, electrical components, etc., can solve the impact of sensitive load power supply quality, the power grid cannot be quickly disconnected from the grid, and the switching transition process is long and other problems, to achieve the effect of easy-to-understand software programming, simple design, and reduce the transition process

Inactive Publication Date: 2016-12-07
TIANJIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

Due to the change of the control object before and after the grid-connected / off-grid conversion, the control strategies of the grid-connected state and the off-grid state are different, and the power grid cannot be disconnected quickly when the grid fails, so the switching transition process is long and the impact is large, which affects the power supply quality of sensitive loads. also have a greater impact

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  • Grid-connection and off-grid seamless switching control method for energy storage inverter

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the drawings.

[0025] The invention includes a control system and an energy storage device. When the inverter is in a grid-connected state, a double closed-loop feedforward decoupling control system is adopted (see figure 2 ), the current inner loop controls the inductor current, the d-axis DC voltage outer loop stabilizes the inverter DC side voltage, and the q-axis grid reactive current outer loop ensures that the system presents a unit power factor to the grid;

[0026] When the inverter is off-grid and the load terminal voltage is maintained by the inverter, the control model needs to consider the influence of the filter capacitor and load. Adopt double closed loop feedforward decoupling control (see image 3 ), the rotating coordinate system is consistent with the grid connection. The inductor current inner loop improves the dynamic response speed and has a current limiting effect. The d-axis ca...

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Abstract

The invention discloses a grid-connection and off-grid seamless switching control method for an energy storage inverter, and relates to the field of a microgrid or a distributed type power generation system. A control system and an energy storage apparatus are included; when the inverter is in a grid-connection state, a dual-closed-loop feedforward decoupling control system (ADRC control) is adopted; when the inverter is in an off-grid state, a load end voltage is maintained by the inverter, and the dual-closed-loop feedforward decoupling control system (ADRC control) is adopted; and when the inverter is between the grid-connection state and the off-grid state, the switching process is performed in three stages, and automatic seamless switch between the grid-connection state and the off-grid state is performed. The grid-connection and off-grid seamless switching control method has the beneficial effects that the hardware apparatus is simple to design, and the software programming is popular and easy to understand; different ways are adopted for active off-grid switching, passive off-grid switching and grid-connection switching with initial phase difference, so that seamless and non-impact switching is realized; in addition, high-speed data calculation capacity and data handling capacity of a computer are utilized, thereby greatly improving the reliability of the control system.

Description

Technical field [0001] The invention relates to the field of micro grids or distributed power generation systems, and in particular to a seamless switching control method of an energy storage inverter that is connected and off-grid. Background technique [0002] With the development of distributed power generation technology, the traditional centralized power generation system is transforming to a distributed power generation system. The distributed power generation system is close to the load and has high power supply reliability. It can supply power to remote mountainous areas or commercial areas, reducing transmission losses. It effectively alleviated my country's energy problems and improved the reliability of power supply. [0003] Distributed power generation systems are mainly composed of distributed power sources, energy storage devices, loads and power grids. Because energy storage inverters have the function of peak shaving and valley filling, they have been widely used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/44
CPCH02J3/381H02J3/388H02J3/44
Inventor 杨沛麟周从容周雪松马幼捷高志强
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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