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Split-phase type low-power-consumption energy storage current transformer and control method and control system thereof

A technology for energy storage converters and control systems, applied in control/regulation systems, DC power input conversion to DC power output, instruments, etc., can solve the problems of low overall system efficiency and inability to achieve battery redundancy

Active Publication Date: 2016-12-14
江苏林洋亿纬储能科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] This patent is aimed at the problems that the traditional two-stage bidirectional converter cannot adapt to the relatively large fluctuation range of the battery DC voltage, cannot realize the redundancy of the battery, and has low overall system efficiency. The structure of the three-phase and three-phase bidirectional converters has been improved, and an innovative control strategy is proposed based on the structure, which can greatly improve the efficiency of the system

Method used

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  • Split-phase type low-power-consumption energy storage current transformer and control method and control system thereof
  • Split-phase type low-power-consumption energy storage current transformer and control method and control system thereof
  • Split-phase type low-power-consumption energy storage current transformer and control method and control system thereof

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Effect test

Embodiment 1

[0078] Example 1: Combination figure 1 with Figure 5 , A split-phase low-power energy storage converter, which includes an AC / DC conversion module, a DC / DC conversion module and an energy storage body. The three-phase AC is connected to the input end of the AC / DC conversion module, and the AC / DC conversion The output end of the module is connected to the input end of the DC / DC conversion module, and the output end of the DC / DC conversion module is connected to the energy storage body. The energy storage body includes a first energy storage body 111 and a second energy storage body 112 connected in series. The negative terminal of the energy storage body 111 is connected to the positive terminal of the second energy storage body 112, wherein:

[0079] The AC / DC conversion module includes a three-phase bridge rectifier circuit. The three-phase bridge rectifier circuit includes a first power switch tube 101, a second power switch tube 102, a third power switch tube 103, a fourth pow...

Embodiment 2

[0085] Embodiment 2: In a phase split low-power energy storage converter as described in Embodiment 1, the AC / DC conversion module further includes a first filter capacitor 113, and the first filter capacitor 113 is connected to AC The two ends of the DC output side Vc1 of the / DC conversion module are used to smooth the DC voltage.

Embodiment 3

[0086] Embodiment 3: In a phase-divided low-power energy storage converter as described in Embodiment 1, the DC / DC conversion module further includes a first filter inductor 109 and a second filter inductor 110, the first The positive terminal of the energy storage body 111 is connected to the fifth power switch tube 105 and the seventh power switch tube 107 through the first filter inductor 109, and the negative terminal of the second energy storage body 112 is connected back to AC / through the second filter inductor 110. The low voltage output terminal of the DC conversion module; the first filter inductor 109 and the second filter inductor 110 are used to smooth the current waveform and limit the sudden change of the current.

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Abstract

The invention discloses a split-phase type low-power-consumption energy storage current transformer and a control method and a control system thereof. The current transformer comprises an AC / DC transformation module, a DC / DC transformation module and energy storage bodies. Three-phase alternating current is connected with the input end of the AC / DC transformation module which has a four-wire star connection or three-wire delta connection structure. The output end of the AC / DC transformation module is connected with the input end of the DC / DC transformation module. The output end of the DC / DC transformation module is connected with the energy storage bodies. The energy storage bodies comprise a first energy storage body and a second energy storage body which are connected in series. The negative electrode end of the first energy storage body is connected with the positive electrode end of the second energy storage body. The DC / DC transformation part of the current transformer uses a creative topological structure capable of realizing redundancy and series connection of battery modules so as to reduce the limitation of the system for DC voltage fluctuation. Besides, the power switch of the DC / DC transformation module does not need to work in the high-frequency state in a full-time manner so that the efficiency of the system can be greatly enhanced and power loss can be reduced.

Description

Technical field [0001] The invention relates to the technical field of circuits, in particular to a split-phase low-power energy storage converter and its control method and control system. Background technique [0002] With economic development, population growth, and the scarcity of fossil energy sources, countries have begun to focus on the development of renewable energy. However, the development of new energy sources such as wind and solar energy is all affected by geographical location, climate and other conditions, resulting in strong intermittentness between wind and solar energy. In order to maximize the use of wind and solar energy, energy storage has become a very reasonable solution. Program. [0003] The existing energy storage technology solutions include two key equipment: batteries and energy storage converters. The function of the battery is to store energy, and the converter is used to connect the device between the battery and the grid. The technical field inv...

Claims

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Application Information

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IPC IPC(8): H02J7/02H02M3/155
CPCH02J7/022H02M3/155
Inventor 曾繁鹏叶曙光方状志
Owner 江苏林洋亿纬储能科技有限公司
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