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Overcurrent protection device of energy storage converter

A technology of energy storage converters and protection devices, which is applied in the field of power systems, can solve problems such as potential safety hazards, and achieve timely protection

Active Publication Date: 2020-09-29
SHENZHEN POWER SUPPLY BUREAU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This protection method is more effective for overcurrents with relatively stable changes. However, in extremely special cases where the current rises rapidly, it is impossible to quickly respond to shutdown protection, and there are great potential safety hazards.

Method used

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  • Overcurrent protection device of energy storage converter
  • Overcurrent protection device of energy storage converter
  • Overcurrent protection device of energy storage converter

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Embodiment Construction

[0041] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

[0042] In the description of the present application, it should be understood that the terms "central", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "top", " The orientation or positional relationship indicated by "bottom", "inner" and "outer" are based on the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the application and simplifying the description, rather than indicating or implying the referred device or positional relationship. Elements must have certain orientations, be cons...

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PUM

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Abstract

The invention relates to an overcurrent protection device for an energy storage converter, and the device comprises: a first-stage protection circuit which comprises a switching control circuit in series connection with the energy storage converter, wherein the switching control circuit is used for disconnecting a loop where the energy storage converter is located when the current of the energy storage converter is greater than a first current threshold; a second-stage protection circuit, wherein a sampling circuit is used for collecting the current of the energy storage converter, a thresholdvalue comparison circuit is used for comparing the current of the energy storage converter with a second current threshold value and outputting a trigger signal when the current of the energy storageconverter is greater than the second current threshold value; an FPGA processing circuit which is used for blocking the control pulse sent to the IGBT by the DSP controller when a trigger signal is received; and a three-stage protection circuit which comprises an optocoupler circuit, wherein the optocoupler circuit is used for blocking the control pulse sent to the IGBT by the DSP controller whenthe voltage of the energy storage converter is greater than a voltage threshold. The over-current protection device is more timely in protection.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to an overcurrent protection device for an energy storage converter. Background technique [0002] As an energy conversion device between the grid and the battery, the energy storage converter is constantly charging and discharging as the load changes at the load end. When the load suddenly increases or is overloaded, the excessive current impact will have a negative impact on the life of the equipment components. [0003] In the traditional energy storage converter overcurrent protection method, the current is first sampled, and then the digital signal processing (DSP, Digital Signal Process) controller calculates the effective value of the current, and the software judges whether the current exceeds the protection threshold, so as to determine whether it is necessary to Block the control pulse that controls the turn-on and turn-off of the IGBT (IGBT, Insulated Gate Bipolar ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/125H02H3/08H02H3/05
CPCH02H7/1257H02H3/08H02H3/05
Inventor 余鹏卢旭范小虎祝维靖皮志武王宗标
Owner SHENZHEN POWER SUPPLY BUREAU