A rectangular wave modulation method for a modular isolated battery energy storage converter

A technology of battery energy storage and modulation method, which is applied in the direction of current collectors, adjusting electric variables, battery circuit devices, etc., to achieve the effect of energy exchange

Active Publication Date: 2018-05-11
SHANGHAI JIAO TONG UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] However, due to the particularity of the structure of the isolated modular multilevel energy storage converter applied to the medium and high voltage DC distribution network, corresponding modulation and control strategies are required to ensure the stable and reliable operation of the system

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  • A rectangular wave modulation method for a modular isolated battery energy storage converter
  • A rectangular wave modulation method for a modular isolated battery energy storage converter
  • A rectangular wave modulation method for a modular isolated battery energy storage converter

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Embodiment Construction

[0020] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

[0021] like figure 1 As shown, the circuit topology of the modular isolated battery energy storage converter in an embodiment of the present invention, wherein: the transformer primary arm Arm_p1 is composed of m H bridges connected in series, and the DC side of each H bridge is connected to the energy storage battery. Transformer primary arm Arm_p1 passes through a filter inductor L p Connect to the primary side of the transformer;

[0022] Each H-bridge of the primary arm Arm_p1 of the isolati...

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Abstract

The invention discloses a rectangular wave modulation method for a modular isolation type battery energy storage converter. According to the invention, the duty ratio of the alternating voltage at the primary and secondary sides of a transformer in a half switching cycle is less than 0.5, the direction and size of energy transfer between an energy storage battery and a direct-current power grid are controlled by adjusting the phase difference between the primary rectangular wave voltage and the secondary rectangular wave voltage, the direct-current bus capacitor voltage of each sub module of the bridge arm at the secondary side of the transformer is stabilized by correcting the phase difference, and the average of current at the secondary side of the transformer, namely, the direct-current distribution network current is adjusted by adjusting the direct-current component of the output voltage of all the sub modules of the bridge arm at the secondary side of the transformer. Therefore, the purpose of module voltage stabilizing and grid-connected current controlling is achieved, and stable and reliable operation of the system is realized.

Description

technical field [0001] The invention relates to the technical field of electrical automation equipment, in particular to a rectangular wave modulation strategy of a modular isolated battery energy storage converter. Background technique [0002] Battery energy storage systems occupy an increasingly important position in all aspects of power systems, especially in important areas such as load balancing, user-side power quality, reactive power compensation, and accommodation of renewable energy. Due to its special function and high cost, the reliability of the battery energy storage system is very important. [0003] Modular multilevel converter (MMC) is widely used in DC distribution network due to its high output voltage level, large scalability and redundant control capacity. The isolated modular multi-level energy storage converter is applied to the DC distribution network. The primary side of the transformer is connected to the energy storage cascaded H-bridge circuit th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02J7/34
CPCH02J7/345H02M3/3353H02M3/33561
Inventor 李睿李新培陈强蔡旭
Owner SHANGHAI JIAO TONG UNIV
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