High voltage direct current transmission system with reactive power compensation on the AC side

摘要

A high voltage direct current (HVDC) transmission system, comprising: a power transmission part (10) configured to convert converting alternating current (AC) energy to direct current (DC) energy; an energy receiving portion (20) configured to convert the conversion DC energy into AC energy; and a DC power transmitting part (140) configured to transfer the converted DC power in the power transmitting part to the power receiving part, wherein one of the power transmitting part (10) and The power receiving part (20) includes: a measuring part that is configured to measure an AC voltage; an AC voltage control unit (230) configured to generate a first reactive power control signal based on the measured AC voltage and a reference AC voltage, wherein the AC voltage control unit AC generates a first difference value between the measured AC voltage and the reference AC voltage as the first reactive power control signal; a reactive energy control unit (240) configured to generate a second reactive energy control signal based on the first reactive energy control signal and a reference reactive energy signal; and an energy control unit (250) configured to control the reactive energy of the energy transmitting part or the energy receiving part based on the second reactive energy control signal, characterized in that the unit reactive energy control signal (240) is further configured to generate a second difference value between a preset reactive energy of the reference reactive energy signal and a reactive energy of the first reactive energy control signal such as second reactive power control signal, the power control unit 250 is further configured to generate an on / off control signal based on the second reactive power control signal and transfer the power signal. on / off control generated to a converter part for controlling the reactive energy of the power transmitting part or the power receiving part.