Research on stability characteristics of large power supply through UHV AC channel and control technology improving transmission capacity

This paper analysed different constrains of power transmission capacity of large power supply through UHV AC channel, mainly including power angle stability, and dynamic stability. The paper also studied the influences of different power supply and grid production timing on the transmission capacity of UHV AC channel. Besides, the paper researched the effects on transmission capacity of UHV AC channel of essential PSS parameter and series compensation. What’s more, the transmission capacities under different PSS parameters and series compensation ratios were calculated. The results showed that the capacity of UHV AC lines could be promoted by optimizing the PSS parameters of units or adding series compensations. The paper also studied the influences of near-area AC lines or main transformers fault on power system stability under different start-up modes. And the corresponding control measures were proposed.