Rapid short-circuit protection system for direct current bus of energy storage converter

An energy storage converter and DC bus technology, applied in the field of converter control and power control, can solve the problems of long relay operation time, battery impact, economic loss, etc., and achieve the effect of avoiding the continued expansion of accidents.

Active Publication Date: 2013-08-14
BEIJING HUADIAN TIANREN ELECTRIC POWER CONTROL TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the DC bus is short-circuited, the instantaneous battery short-circuit discharge current is relatively large, and the relay takes a long time to operate. It usually takes tens of milliseconds to complete the action.

Method used

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  • Rapid short-circuit protection system for direct current bus of energy storage converter
  • Rapid short-circuit protection system for direct current bus of energy storage converter
  • Rapid short-circuit protection system for direct current bus of energy storage converter

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[0021] The technical solution of the present invention will be further described in detail below based on the drawings of the specification.

[0022] Such as figure 1 Shown is the conventional circuit schematic diagram of the energy storage converter, including the main inductor, DC-AC circuit, DC bus, bidirectional DC-DC circuit and battery. In the bidirectional DC-DC circuit, the first IGBT K top With the first diode D top Anti-parallel, second IGBTK bot With the second diode D bot Anti-parallel connection, the emitter of the first IGBT is connected in series with the gate of the second IGBT, the first inductance L DC Connected in series with the emitter of the first IGBT and the first relay K DC Between, the other end of the first relay is connected to the first filter capacitor C filter , The first filter capacitor is connected in parallel between the first relay and the second IGBT emitter. The output end of the bidirectional DC-DC circuit is connected to the battery, w...

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Abstract

The invention provides a system for a rapid short-circuit protection system for a direct current bus of an energy storage converter. Compared with a conventional short circuit protection structure based on a breaker or a fuse, the rapid short-circuit protection system for the direct current bus of the energy storage converter is based on a rapid cutoff capability of an IGBT (Insulated Gate Bipolar Translator), a power supply circuit can be cut off in hundreds of microseconds, and the safety of an energy storage battery and the energy storage converter is protected. According to the system, functions of all modules can be positioned clearly, the structure is compact, the installation and the debugging are facilitated, the response time of protection action is remarkably shortened, and the reliability of an energy storage converter system is improved.

Description

Technical field [0001] The invention belongs to the technical field of electric power control, in particular to a technical field of variable current control. Background technique [0002] As a kind of renewable energy, wind power is receiving more and more attention. Due to the inherent characteristics of wind energy, the output of wind power will fluctuate at any time, causing serious problems for grid-connected operation. The supporting use of energy storage devices in the wind power system will effectively improve the adverse effects of wind power on the grid, increase the allowable access rate of the grid to the grid connection of wind power, improve the smoothness of wind power output, and achieve functions such as peak shaving and valley filling. [0003] The energy storage type converter device may also be referred to as a power conversion system (power converting system, hereinafter referred to as PCS), which is connected to the power grid and the energy storage battery c...

Claims

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Application Information

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IPC IPC(8): H02H7/18H02J3/32
Inventor 陈剑吴国荣鹿怀骥李志强王思耕陈飞
Owner BEIJING HUADIAN TIANREN ELECTRIC POWER CONTROL TECH
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