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Reference: ISH2015_447

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A New Improved Coordination Control Strategy for MMC Based Multi-terminal HVDC Systems



For MMC based multi-terminal HVDC systems, ensuring steady operation of the system, the system control strategy is the prior problem. The basic require of the system control strategy is to re-establish voltage and power balance of dc grid when a converter is tripped and suppress the oscillations and transients. A new improved coordination control strategy is proposed in this paper which combines the improved voltage margin control scheme and power deviation control method. Simulations done with an five-terminal HVDC system in PSCAD/EMTDC are exploited to discuss and assess the advantages of it. The simulation results prove that the re-established power and dc voltage balanced is close to origin reference value. And the strategy can also suppress the oscillation of dc voltage and power because of unbalanced power.

File Size: 1,1 MB

Year: 2015

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