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A quasi-square wave modulation method for a modular isolated battery energy storage converter

A technology of battery energy storage and modulation method, which is applied to the system of storing electric energy, adjusting electric variables, converting DC power input to DC power output, etc., to achieve the effect of energy exchange

Active Publication Date: 2018-05-11
SHANGHAI JIAO TONG UNIV
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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 quasi-square wave modulation method for a modular isolated battery energy storage converter
  • A quasi-square wave modulation method for a modular isolated battery energy storage converter
  • A quasi-square wave modulation method for a modular isolated battery energy storage converter

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Embodiment Construction

[0022] 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.

[0023] Such as figure 1 As shown, it is the circuit topology of an isolated modular multilevel energy storage converter based on a DC power grid according to an embodiment of the present invention: the primary side of the transformer passes through a filter inductor L p Connected to the output terminal of the primary arm Arm_p1, the primary arm Arm_p1 of the transformer is formed by cascading m H-bridges, the series output of the m H-bridges is used as the output of the primary arm Arm_p1, and the...

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Abstract

The invention discloses a quasi-square wave modulation method for a modularized isolation type battery energy storage converter. Primary and secondary side AC voltage of a transformer is not a standard quasi-square wave, and the rising edge and the falling edge are step-shaped, i.e. duty ratio of AC output voltage of all the H-bridges of a primary side bridge arm Arm_p1 and all the submodules of a secondary side bridge arm Arm_s1 is less than or equal to 0.5 and is not equal to each other. The energy transfer direction and size of an energy storage battery and a DC power gird are controlled by adjusting phase difference between primary side quasi-square wave voltage and secondary side quasi-square wave voltage. DC bus capacitance voltage of all the submodules of the secondary side bridge arm of the transformer is stabilized by correcting the phase difference. The secondary side average current value, i.e. DC power distribution network side current, of the transformer is adjusted by adjusting the output voltage DC components of all the submodules of the secondary side bridge arm of the transformer so that the objective of stabilizing module voltage and controlling grid-connected current can be achieved, and system stable and reliable operation can be realized.

Description

technical field [0001] The invention relates to the technical field of electrical automation equipment, in particular to a quasi-square wave modulation method 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 thr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02J15/00
CPCH02J15/00H02M3/33523H02M3/33584
Inventor 李睿李新培陈强蔡旭
Owner SHANGHAI JIAO TONG UNIV
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