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Simulation of a short circuit downstream a high voltage battery

IP.com Disclosure Number: IPCOM000250295D
Publication Date: 2017-Jun-23

Publishing Venue

The IP.com Prior Art Database

Abstract

The proposed solution uses a Transformer Rectifier Unit (TRU) for simulating a short circuit downstream a high voltage battery. In a preferred embodiment, the rectifier uses thyristors which permit to control the voltage during the short circuit.

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ABSTRACT :

 The proposed solution uses a Transformer Rectifier Unit (TRU) for simulating a short circuit downstream a high voltage battery.

 In a preferred embodiment, the rectifier uses thyristors which permit to control the voltage during the short circuit.

1

Simulation of a short circuit downstream a high voltage battery

Context : High voltage batteries will be more and more used in the future, for example: Automotive (hybrid or electric cars); Aviation (hybrid or electric planes); Etc.

 The potential voltage range of these batteries would be 500VDC to 4kVDC.  It will be necessary to perform tests of the electrical circuits and equipment (circuit

breakers, contactors…). Sometimes, these high voltage batteries will not be available for doing these tests,

 So, it is necessary to propose means for simulating these high voltage batteries during these tests.

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Problematic : Reproduce short-circuit downstream a battery without having the battery. Current level from 2kA to 10kA or more. Output voltage (no load) 500VDC to 4kVDC  Short-circuit duration ~ 300ms (max 1000ms)  Voltage representative of a real battery behaviour during short circuit

3

Instantaneous power up to 40 MW !!! TGBT is 1MW only …

… but only 12MJ or 3kWh !!!

NiCad short-circuit

Solution 0.1 : truck batteries Pb 12VDC in serie ( & parallel) • Pro : high representativeness • Con :  4000/12 = at least 334 batteries in serial !!!  Safety issues (assembly, chemical, … )

4

x 334 8300 kg & very expansive

Not realistic abandoned

Solution 1.0 : Transformer Rectifier Unit with Diodes

Transformer & rectifier sized for short-circuit capability only Problem : only one output voltage  one different TRU per kind of test/customer.

5

SP 50Hz400V

+

_ 0

Solution 1.1 : Transformer multi ratio Rectifier Unit with Diodes

Transformer & rectifier sized for short-circuit capability only Output no load voltage can be set step by step close to the desired voltage. Problem : during short, the output voltage is not representative of battery behaviour.

6

SP 50Hz400V

+

_ 0

7

Solution 1.2 : Transformer multi ratio R...