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When rectifier station of LCC-HVDC has power fluctuations running at large load, AC filters controlled in groups at rectifier station are switched frequently. That problem potentially has impact on service life of corresponding circuit breaker and threatens the safe operation of the DC system. In this paper, due to the characteristic of close connection between rectifier station and AC system, the AC filters in the station and the generators in AC system provide reactive power collaboratively to reduce the switching times of AC filters. Combined with the existing reactive power control scheme, the proposed strategy takes the net exchange of reactive power between DC system and AC system and the commutation bus voltage as the control variables with the starting point of taking full account of the reactive power support capacity of the generators. The simulation results in power system analysis and synthesis program (PSASP) show the effectiveness of the proposed method. Keywords-rectifier station; high power; reactive power control; voltage limit

An Optimal Reactive Power Control Scheme for Rectifier Station of LCC-HVDC System during High Power Transmission