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A control method for seamless switching between off-grid and grid-connected three-phase energy storage converters

A seamless switching, three-phase energy storage technology, applied in the direction of AC network circuit, AC network load balancing, single-network parallel feeding arrangement, etc., to achieve seamless switching, improve performance indicators, and avoid the influence of three-phase imbalance Effect

Active Publication Date: 2021-08-31
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The purpose of the present invention is to provide a control method for seamless switching of off-grid and grid-connected three-phase energy storage converters, so as to solve the control switching problem of traditional three-phase energy storage converters from off-grid and grid-connected modes, and realize smooth off-grid and grid-connected modes Seamless switching to avoid impact on the load

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  • A control method for seamless switching between off-grid and grid-connected three-phase energy storage converters
  • A control method for seamless switching between off-grid and grid-connected three-phase energy storage converters
  • A control method for seamless switching between off-grid and grid-connected three-phase energy storage converters

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[0021] In order to make the purpose, technical solution and advantages of the present invention more clear and definite, the content of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only parts related to the present invention are shown in the drawings but not all content.

[0022] figure 1 It is the circuit topology diagram of the three-phase energy storage converter, using a typical T-type three-level dc-ac inverter circuit topology, the battery pack BAT 1 and BAT 2 In series, midpoint O and inductance L n After connection, it is used as the neutral wire of the converter and connected to the neutral wire N of the grid. The output of the three-phase bridge a...

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Abstract

The invention provides a control method for off-grid seamless switching of a three-phase energy storage converter. Both the grid-connected operation mode and the off-grid operation mode have the same control structure, including inverter voltage loop, inductor current loop, grid Current command calculation module. This method is based on the three-phase decoupling control under the dq rotating coordinate system, and constructs a virtual three-phase system through the three phases A, B, and C respectively to realize the independence of three-phase control. The method of the invention can effectively solve the problem of control algorithm switching in the operation mode switching process of the three-phase energy storage converter, realize smooth and seamless switching of off-grid and grid-connected modes, and avoid impact on loads.

Description

technical field [0001] The invention relates to the technical field of electrochemical energy storage converters, in particular to a control method for seamless switching between off-grid and grid-connected three-phase energy storage converters. Background technique [0002] According to the operation mode, energy storage converters are divided into grid-connected converters, off-grid converters, and off-grid converters. The grid-connected energy storage converter has a P / Q working mode, and is generally controlled as a current source, and the power of the energy storage battery is dispatched through the host computer. The off-grid energy storage converter has a V / F working mode and is generally called a voltage source inverter. The off-grid energy storage converter has both grid-connected and off-grid functions. Generally, it mainly works on the grid. It performs grid-connected P / Q control when the grid is normal, and switches to grid-connected P / Q control when the grid is...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/32
CPCH02J3/32H02J3/38H02J3/388
Inventor 吴昌宏舒杰王浩张继元
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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