A safety control method and system for suppressing continuous commutation failure of a DC system
A technology for commutation failure and DC system, applied in the field of suppressing continuous commutation failure of DC system
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[0087] When the stable control system detects that the DC does not fail and detects the reverse side shunt bus voltage dropped to 0.9PU or less and maintains 60 ms, turn on the DC power modulation method, performs speed reduction, reducing DC modulation power; until detection The inverter side shifting bus voltage rises to 0.8pu or more and maintains 60 ms, DC power speed drop exits, rapid power recovery, and continuous phase failure fault risk. The specific DC power adjustment range is determined based on the operating state of the power grid before the fault, the direct flow rate reduction power value is greater than the receiver system in a strong AC state when the receiving system is in a weak AC state before the fault occurs.
[0088] The method of determining the speed reduction value of DC power is as follows:
[0089] Short-circuit ratio is an important parameter reflecting the intensity of the acceptance terminal. DC system short circuit ratio (SCR) is defined as follows:...
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