A modular isolated battery energy storage converter and its modulation method

A technology of battery energy storage and modulation method, which is applied in the direction of conversion equipment, electrical components, and circuit devices that are converted into AC in the middle to achieve the effect of energy exchange

Active Publication Date: 2018-07-03
SHANGHAI JIAO TONG UNIV
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AI Technical Summary

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 modular isolated battery energy storage converter and its modulation method
  • A modular isolated battery energy storage converter and its modulation method
  • A modular isolated battery energy storage converter and its modulation method

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Embodiment Construction

[0021] 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 pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made, and these all fall within the protection scope of the present invention.

[0022] Such as figure 1 As shown, the circuit topology of the modular isolated battery energy storage converter in an embodiment of the present invention, in which: the transformer primary side arm Arm_p1 is composed of m H bridges in series, and the DC side of each H bridge is connected to the energy storage battery, The transformer primary side arm Arm_p1 passes through a filter inductor L p Connect to the primary side of the transformer;

[0023] Each H bridge of the p...

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Abstract

The invention discloses a modular isolation type battery energy storage convertor and a modulation method therefor. A topological structure of the converter is that a primary side bridge arm of a transformer consists of m H bridges connected in series and is connected with a primary side of the transformer through filter inductance Lp; and one end of a secondary side of the transformer is connected with the negative electrode of a direct-current power grid bus through filter inductance Ls and a secondary side bridge arm while the other end of the secondary side of the transformer is connected with the positive electrode of the direct-current power grid bus. According to the method, the direction and capacity of energy transmission between an energy storage battery and a direct-current power grid are controlled by adjusting a phase difference between a primary side square-wave voltage and a secondary side square-wave voltage of the isolation transformer; direct-current bus capacitance voltages of all sub-modules of the secondary side bridge arm of the transformer are stabilized by correcting the phase difference; and a secondary side current average, namely, a direct-current power distribution network side current, of the transformer is adjusted by adjusting output voltages and currents of all the sub-modules of the secondary side bridge arm of the transformer, so that the purposes of stabilizing the module voltages and controlling the grid-connection currents are achieved and a system can run stably and reliably.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/28H02J1/00
CPCH02J1/00H02M3/28
Inventor 李睿李新培陈强蔡旭
Owner SHANGHAI JIAO TONG UNIV
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