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Energy storage type MMC current transformer adopting independent control of battery current

A battery current and independent control technology, which is applied to battery circuit devices, AC power input conversion to DC power output, collectors, etc., can solve the problems of battery utilization and life difference constraints, and achieve the reduction of consistency requirements and battery life. Effects of production cost, extension of service life, and improvement of utilization rate

Inactive Publication Date: 2015-09-16
北京亿利智慧能源科技有限公司
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AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the utilization rate and life of batteries in the battery energy storage system are restricted by the difference of single batteries, the purpose of the present invention is to provide an energy storage type MMC converter that adopts independent control of battery current. In the MMC converter, the modulation wave of each sub-module is changed to independently control the charging and discharging current of the energy storage battery, so as to improve the utilization rate and service life of the battery

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  • Energy storage type MMC current transformer adopting independent control of battery current
  • Energy storage type MMC current transformer adopting independent control of battery current
  • Energy storage type MMC current transformer adopting independent control of battery current

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Embodiment Construction

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are explanations of the present invention and the present invention is not limited to the following examples.

[0026] A preferred implementation example is given below on the basis of the technical solution of the content of the invention.

[0027] Such as figure 1 It is a three-phase energy storage grid-connected MMC topology with 2N sub-modules per phase. It adds energy storage batteries on the basis of traditional MMC. Each phase of the topology is divided into an upper bridge arm and a lower bridge arm, and each bridge arm has N identical sub-modules with energy storage batteries and an inductor. The three-phase energy storage type grid-connected MMC has a common DC bus, which can be connected to the DC grid, while the AC side is connected to the three-phase AC grid. figure 2 It is the circuit topology of a single sub...

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Abstract

The invention provides an energy storage type MMC current transformer adopting independent control of battery current, and belongs to the field of energy storage current transformers and control. The energy storage type MMC current transformer adopts an independent control method of battery current, and the final modulating wave of each submodule is obtained by changing the size of each component in the corresponding modulating wave. The modulating waves of the submodules are synthesized by three components, and the battery charging and discharging power, output direct-current power and output alternating-current power of the submodules are controlled respectively. The energy storage type MMC current transformer adopting independent control of battery current is taken as an object, the independent control of battery current is realized by changing the size of each component in the corresponding modulating wave of the submodule, so that the battery utilization rate is improved, and the service life is prolonged.

Description

technical field [0001] The invention relates to the field of energy storage converters and controls, in particular to an energy storage type MMC converter adopting battery current independent control. Background technique [0002] With the development of smart grid, a large amount of renewable energy is integrated into the grid, and renewable energy such as wind energy and solar energy have small capacity, are far away from user centers, and are scattered in location, and are mainly distributed in remote border areas of my country. Therefore, there is an urgent need for flexible, The economical and environmentally friendly way of power transmission and distribution, high voltage direct current transmission (HVDC) was born. Modular multilevel converter (MMC) has been widely used as the core device of HVDC transmission. Each phase of MMC is composed of upper and lower bridge arms and inductors, and each bridge arm is composed of several sub-modules in series. This circuit stru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02J3/38H02J7/00
Inventor 梁晖郭龙牛利勇李景新
Owner 北京亿利智慧能源科技有限公司
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