Battery energy storage system with arc flash protection, energy conversion system and protection method
First Claim
1. A battery energy storage system, comprising:
- a battery assembly for storing and providing energy, wherein the battery assembly is rechargeable; and
a protection system comprising an arc flash protection device for protection against hazards from arc flashes, wherein the arc flash protection device is arranged;
to sense a battery current provided by the battery arrangement and to compare it with a predefined maximum current threshold,to sense a voltage provided by the battery assembly and to compare it with a predefined minimum voltage threshold, andif the sensed battery current is greater than the maximum current threshold and/or the sensed battery voltage is smaller than the minimum voltage threshold, to determine that arc flash conditions are present and to initiate protective measures to prevent further operation of the battery assembly.
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Accused Products
Abstract
A battery energy storage system is disclosed, the battery energy storage system comprising a rechargeable battery assembly for storing and providing energy and a protection system including an arc flash protection device to protect against risks due to arc flashes. The arc flash protection device comprises an overcurrent protection unit which detects overcurrent conditions indicating arc flash conditions in case of a low impedance of the battery assembly and an undervoltage protection unit which detects undervoltage conditions indicating arc flash conditions in case of a low impedance of the battery assembly, wherein upon detecting the overcurrent conditions and/or the undervoltage conditions for a predetermined minimum time period, the arc flash protection device initiates protective measures to prevent further operation of the battery assembly. An energy conversion system comprising such a battery energy storage system, which can be used for stationary and mobile energy supply or distribution applications, is also disclosed.
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Citations
20 Claims
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1. A battery energy storage system, comprising:
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a battery assembly for storing and providing energy, wherein the battery assembly is rechargeable; and a protection system comprising an arc flash protection device for protection against hazards from arc flashes, wherein the arc flash protection device is arranged; to sense a battery current provided by the battery arrangement and to compare it with a predefined maximum current threshold, to sense a voltage provided by the battery assembly and to compare it with a predefined minimum voltage threshold, and if the sensed battery current is greater than the maximum current threshold and/or the sensed battery voltage is smaller than the minimum voltage threshold, to determine that arc flash conditions are present and to initiate protective measures to prevent further operation of the battery assembly. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An energy conversion system, comprising:
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a battery assembly for storing and providing energy, wherein the battery assembly is rechargeable; a converter device connected to the battery assembly via a DC link for converting input side DC voltage energy provided by the battery assembly into output side AC voltage energy or vice versa; and a protection system comprising an arc flash protection device for protection against hazards from arc flashes, wherein the arc flash protection device is arranged; to sense a battery current provided by the battery arrangement and to compare it with a predefined maximum current threshold; to sense a voltage provided by the battery assembly and to compare it with a predefined minimum voltage threshold; and if the sensed battery current is greater than the maximum current threshold and/or the sensed battery voltage is smaller than the minimum voltage threshold, to determine that arc flash conditions are present and to initiate protective measures to prevent further operation of the battery assembly. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A method for protecting a battery energy storage system against hazards from arc flashes, wherein the battery energy storage system comprises a rechargeable battery assembly for storing and providing DC voltage energy, the method comprising:
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sensing a battery current provided by the battery assembly and delivering a battery current signal indicative thereof; comparing the battery current signal with a predefined maximum current threshold; sensing a battery voltage provided by the battery assembly and delivering a battery voltage signal indicative thereof; comparing the battery voltage signal with a predefined minimum voltage threshold; and in case that the battery current signal is greater than the maximum current threshold for a first minimum time duration and/or the battery voltage signal is smaller than the minimum voltage threshold for a second minimum time duration, determining that arc flash conditions are present and initiating protection measures to prevent further operation of the battery assembly.
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Specification