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Energy storage grid-connected converter based on reverse-blocking type three levels, and control method therefor

A control method and reverse-resistance technology, applied in the direction of converting AC power input to DC power output, electrical components, circuit devices, etc., can solve the problems of uneven charging and discharging of battery packs, low reliability of battery packs, and capacity limitations, etc. Achieve the effect of reducing volume and weight, facilitating stacking design and reducing volume

Active Publication Date: 2016-07-13
SOUTHEAST UNIV +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the single-stage structure, due to the high DC side voltage (generally greater than 700V), a large number of single cells need to be connected in series, the reliability of the battery pack is low, and the direct parallel connection of the battery pack has the problems of circulating current and uneven charging and discharging. Capacity is limited by the number of battery packs connected in parallel

Method used

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  • Energy storage grid-connected converter based on reverse-blocking type three levels, and control method therefor
  • Energy storage grid-connected converter based on reverse-blocking type three levels, and control method therefor
  • Energy storage grid-connected converter based on reverse-blocking type three levels, and control method therefor

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with the accompanying drawings.

[0031] Such as figure 1 Shown is a reverse-resistance three-level energy storage grid-connected converter, including sequentially cascaded batteries, DC / DC converters, DC side capacitors, reverse resistance three-level converters and LC filters .

[0032] The accumulator battery pack with inductance L dc In series, the energy storage medium of the battery is an energy type energy storage medium or a power type energy storage medium.

[0033] Such as figure 2 As shown, the DC / DC converter is a half-bridge Buck / Boost bidirectional converter, including a power switch tube S 1 and power switch S 2 , the positive electrode of the battery is connected to the inductance L dc at one end, the inductance L dc The other end of the power switch tube S 2 One end of the power switch and the power switch S 1 One end of the battery, the negative pole of the battery is connec...

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Abstract

The invention discloses an energy storage grid-connected converter based on reverse-blocking type three levels, and a control method therefor. The converter comprises a storage battery, a DC / DC converter, a DC-side capacitor, a reverse-blocking type three-level converter, and an LC filter, wherein the storage battery, the DC / DC converter, the DC-side capacitor, the reverse-blocking type three-level converter and the LC filter are sequentially cascaded. The control method comprises the steps: DC / DC end control and three-level converter control. A DC / DC end controller is used for the management of the charging and discharging of the storage battery, and the three-level converter control comprises the control of the output current of an inverter through a double-closed-loop decoupling control. The method achieves the functions of step-up / step-down, inversion, large-power energy storage and grid connection through power conversion, achieves the control from the storage battery to a power grid through a simpler structure, reduces the energy storage cost, achieves reactive compensation and power peak control, and improves the utilization rate and quality of the power grid.

Description

technical field [0001] The invention relates to a reverse-resistance type three-level energy storage grid-connected converter and a control method thereof, belonging to large-capacity energy storage grid-connected technology. Background technique [0002] In order to meet the sustainable development of energy and environment, countries all over the world are vigorously developing renewable energy, especially wind energy and solar energy have become the focus of development and utilization. Studies have shown that if the installed capacity of wind power accounts for 20% or even higher of the total installed capacity, the peak-shaving capability and safe operation of the power grid will face enormous challenges. Large-scale energy storage can effectively absorb renewable energy power generation, thereby greatly improving the efficiency of wind power and other grid connections, eliminating the hazards of wind and solar power generation fluctuations to grid stability, and making...

Claims

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Application Information

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IPC IPC(8): H02M7/483H02J3/38
CPCH02J3/387H02M7/483
Inventor 赵剑锋杨斌赵志宏曹武刘康礼
Owner SOUTHEAST UNIV
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