期刊
IEEE TRANSACTIONS ON POWER SYSTEMS
卷 32, 期 5, 页码 3758-3767出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPWRS.2016.2634088
关键词
HVDC transmission; multi-terminal; power systems; reactive power; transient stability; VSC HVDC
资金
- Spanish Government through the INNPACTO Project ESP-LIDER [IPT-2011-0844-920000]
- Spanish RETOS program [ENE2014-57760-C2-1R]
- PRICAM-CM Project [S2013/ICE-2933]
- Madrid regional Government
This paper proposes a new control strategy for the reactive-power injections of voltage-source converters (VSCs) in high-voltage direct-current multi-terminal systems to improve power system transient stability. A reactive-power supplementary signal is provided for each converter. Its value is proportional to the frequency deviation of its corresponding AC bus with respect to the weighed-average frequency of the multi-terminal system stations. The purpose is to increase (decrease) the electromagnetic torque of generators close to those terminals, in which the frequency is above (below) the weighed-average frequency used. The AC frequency for all VSC stations is always available locally for synchronization purposes and could be used by a central controller. Simulations have been carried out using PSS/E, and the results have shown that transient stability can be improved using this strategy. Since this approach uses global measurements of all VSC stations, the impact of the communication delays has been analyzed, concluding that the negative effect is small, for realistic latency values.
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