CAJ | 학술논문

直流系统低功率运行时受端无功严重过剩，电网稳态电压偏高问题十分严重。对直流系统低功率运行时无功控制策略进行探讨，推导了无功消耗、关断角、换相角、直流电流等变量之间相互关系，计算受端换流站关断角和换流变分接头调节措施对直流无功功率消耗的影响，提出利用直流系统无功消耗的非线性，提高最小关断角可以吸收多余无功，有效解决直流系统低功率运行时的交流电网电压升高问题。
직류계통저공솔운행시수단무공엄중과잉，전망은태전압편고문제십분엄중。대직류계통저공솔운행시무공공제책략진행탐토，추도료무공소모、관단각、환상각、직류전류등변량지간상호관계，계산수단환류참관단각화환류변분접두조절조시대직류무공공솔소모적영향，제출이용직류계통무공소모적비선성，제고최소관단각가이흡수다여무공，유효해결직류계통저공솔운행시적교류전망전압승고문제。
There are three conditions making the HVDC power transmission system operated in low power transmission： putting generation units at sending end into operation, seasonal power generation of upstream hydropower station and a period after putting HVDC system into operation. When HVDC transmission system is operated in low power operation condition, serious surplus of reactive power will occur in receiving end and it makes system voltage deviating from its normal value and the obvious voltage rise appears at the receiving end. The reactive power control strategy under low power transmission of HVDC system is discussed and the relations among such variables as reactive power consumption, extinction angle, commutation angle and DC current are derived, and the impacts of the adjustment of the extinction angle of converter station at receiving end and the adjustment of on-load tap changer of converter transformer on reactive power consumption in HVDC system are calculated, and then it is proposed that according to the nonlinearity of reactive power consumption in HVDC system the voltage rise problem caused by the low power transmission of HVDC system can be effectively solved by increasing the minimal extinction angle to absorb the excrescent reactive power.