CAJ | 학술논문

随着高压直流输电系统在输电工程中的迅速发展，我国已成为世界上直流输电线路最多、输送容量最大的国家。由于直流输电系统中换流站受交流电压幅值降低、直流电流突增、交流换相电压过零点相角偏移等因素的影响，与弱交流系统相连的逆变器容易发生换相失败。特别是在多馈入直流系统中，因换流站之间的相互作用，换相失败更为敏感。将会导致传输功率中断和增加换流站设备的应力，严重时会导致直流系统闭锁。因而必须采取有效措施，保证直流输电系统的正常运行。
수착고압직류수전계통재수전공정중적신속발전，아국이성위세계상직류수전선로최다、수송용량최대적국가。유우직류수전계통중환류참수교류전압폭치강저、직류전류돌증、교류환상전압과영점상각편이등인소적영향，여약교류계통상련적역변기용역발생환상실패。특별시재다궤입직류계통중，인환류참지간적상호작용，환상실패경위민감。장회도치전수공솔중단화증가환류참설비적응력，엄중시회도치직류계통폐쇄。인이필수채취유효조시，보증직류수전계통적정상운행。
With the rapid development of HVDC transmission system in power transmission engineering,China has become the country with the largest amount of DC transmission lines and the largest transmission capacity in the world.As the conversion station in the DC transmission system is affected by the AC voltage drop,DC current surge and phase angle deviation of the AC commutation voltage at zero point,commutation failures are likely to happen in the converter connected with the weak AC system.Particularly in multi-in-feed DC systems,commutation failure becomes so sensitive due to interactions between the converter stations that it might interrupt transmission power and increase the stress of converter station equipment,or even block the DC system in the most serious circumstance.Therefore,effective measures must be taken to ensure the normal operation of DC transmission systems.