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Low-Voltage Fault Ride Through of the Modular Multilevel Converter in a Battery Energy Storage System Connected Directly to the Medium Voltage Grid
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| Author(s) |
Andre HILLERS, Jürgen BIELA |
| Abstract |
Nowadays, even small and medium sized power generators are required to ride through low-voltage faults without disconnecting themselves from the grid. To the modular multilevel converter (MMC) in a battery energy storage system based on split batteries (sBESS), this presents a unique requirement: In case of a low-voltage grid-fault, the arm voltages leave their steady-state trajectory which can lead to undervoltage or overvoltage in the modules, provoking an unacceptable shutdown of the whole converter. This paper presents a new control strategy to support the arm voltages by making use of the split batteries in case of a fault. The converter can ride through consecutive grid-faults while continuing to supply a current to support the grid and can immediately resume operation after the fault is cleared. |
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| Filename: | 0568-epe2014-full-15270580.pdf |
| Filesize: | 1.59 MB |
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| Type |
Members Only |
| Date |
Last modified 2015-06-08 by System |
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