During the power modulation process of line com-mutated converter-based high-voltage direct current(LCC-HVDC),the transient power mismatch between the fast-change converter station and the slow-response reactive power...During the power modulation process of line com-mutated converter-based high-voltage direct current(LCC-HVDC),the transient power mismatch between the fast-change converter station and the slow-response reactive power compen-sators(RPCs)can cause transient voltage disturbances at the weak sending end of the AC grid.To mitigate such voltage dis-turbances,this paper proposes a coordinated feedback power control method for the hybrid multi-infeed HVDC(HMI-HVDC)system comprising an LCC-HVDC and voltage source converter-based HVDC(VSC-HVDC)systems.The mechanism of the disturbance caused by transient power mismatch is quan-titatively analyzed,and the numerical relationship between the instantaneous unbalanced power and the AC voltage is derived.Based on the numerical relationship and considering the time-varying relationship of reactive power between converter sta-tions,the unbalanced power is set as the feedback and coordi-nately distributed among the inverter stations of VSC-HVDC,and the rectifier and the inverter stations of LCC-HVDC.Simu-lation results verify that the proposed method can effectively suppress voltage disturbance without relying on remote commu-nication,thus enhancing the operation performance of the HMI-HVDC system.展开更多
基金This work was supported in part by the State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(No.LAPS23020).
文摘During the power modulation process of line com-mutated converter-based high-voltage direct current(LCC-HVDC),the transient power mismatch between the fast-change converter station and the slow-response reactive power compen-sators(RPCs)can cause transient voltage disturbances at the weak sending end of the AC grid.To mitigate such voltage dis-turbances,this paper proposes a coordinated feedback power control method for the hybrid multi-infeed HVDC(HMI-HVDC)system comprising an LCC-HVDC and voltage source converter-based HVDC(VSC-HVDC)systems.The mechanism of the disturbance caused by transient power mismatch is quan-titatively analyzed,and the numerical relationship between the instantaneous unbalanced power and the AC voltage is derived.Based on the numerical relationship and considering the time-varying relationship of reactive power between converter sta-tions,the unbalanced power is set as the feedback and coordi-nately distributed among the inverter stations of VSC-HVDC,and the rectifier and the inverter stations of LCC-HVDC.Simu-lation results verify that the proposed method can effectively suppress voltage disturbance without relying on remote commu-nication,thus enhancing the operation performance of the HMI-HVDC system.
