| Our country is in the age of rapid development of power industry, electric power development level of science and technology progresses day by day, at the same time, also gradually highlights, many of our country’s particular problems such as energy resource distribution and reverse distribution to the load center, which requires the transmission lines in the grid to meet greater distances, larger capacity, and higher efficiency of transmission characteristics, in order to realize our country electric power enterprise "west to east, north and south each other aid, regional network" strategy. Overview of Yunnan electric power system "twelfth five-year" plan blueprint, in 2015, Yunnan power grid will become the world’s leading of full-scale, ac/dc voltage level mixed operation, large-scale cross-regional networks of large power network, has the most complicated technical difficulty, is a the oncoming difficult challenge.This article in view of the Yunnan power grid in 2015 feng limit data, with ChuSui dc, overseas Chinese dc general, bovine plexus double dc as a research focus, a large amount of simulation computation, the above high-voltage dc lines appeared atresia fault transient stability of the system and the corresponding stability control measures are analyzed in detail, and the analysis of the existing stability control measures in the system-the effect of the cutting machine measures after, on the basis of actual data of Yunnan power grid, the dc active power emergency enhance modulation strategy has carried on the thorough research and discussion.First of all, the knowledge on the basis of the principles of high-voltage direct current transmission, from the area such as law, analyses the dc active power modulation (i.e., the emergency power of the dc support) to improve the transient stability of ac/dc mixed system performance influence mechanism.Then in Yunnan power grid in the role of the existing stability control measures, three HVDC line blocking fault happens, the calculation and analysis system generator Angle, electromagnetic power generating set, Yunnan power grid nine big cross section line active power as well as the key line active power index, the effect of the stability control measures of existing TAB.And then, on the cutter measures of existing joined the essay focuses on the research of dc active power modulation effect, blocking occurred when a line failure, the other two lines to support emergency power, thus cutting machine quantity after the system failure, effectively relieve and output under the traditional cutting machine stability control measures of bus frequency deviation curve, compared with dc modulation effect of bus frequency offset, it is concluded that the dc active power modulation can also optimize frequency curve, generally speaking, in this article after the analysis of actual simulation calculation, dc active power modulation measures in improving the transient stability of the system has got a more satisfactory modulation effect.And finally, on how to implement ChuSui dc, overseas Chinese emergency between dc and bovine plexus double dc frequency support of specific methods for implementation is proposed, namely between the three dc lines equipped with information and communication channel, and the schematic diagram is given.
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