CAJ | 학술논문

近年来，交直流混联系统飞速发展，其规模庞大、结构复杂，导致电网运行的安全性、可靠性更加难以驾驭。伴随着风电、光伏等间歇性能源在直流送端的不断接入，交直流系统的运行特性也愈加复杂，给当前电网带来了一些新问题。其中直流闭锁故障对电压稳定性影响是限制电网电能输送的主要因素，闭锁故障后电网电压问题存在突发性和隐蔽性的特点，难以在事故前期洞察其征兆，无法及时采取有效措施。因此，分析了并网风电场电压波动原理及交直流混联系统的安全运行特点。当特高压直流发生闭锁故障时，通过采取不同的切机控制措施，将引起的交直流混联系统电压的差异，并针对新疆某地区风电场的电压分布特性进行研究分析，提出改善电压稳定能力的措施。通过模拟直流闭锁故障进行分析，对提高交直流混联系统的电压稳定性及减小电压波动对风机脱网影响具有重要的参考价值。
근년래，교직류혼련계통비속발전，기규모방대、결구복잡，도치전망운행적안전성、가고성경가난이가어。반수착풍전、광복등간헐성능원재직류송단적불단접입，교직류계통적운행특성야유가복잡，급당전전망대래료일사신문제。기중직류폐쇄고장대전압은정성영향시한제전망전능수송적주요인소，폐쇄고장후전망전압문제존재돌발성화은폐성적특점，난이재사고전기동찰기정조，무법급시채취유효조시。인차，분석료병망풍전장전압파동원리급교직류혼련계통적안전운행특점。당특고압직류발생폐쇄고장시，통과채취불동적절궤공제조시，장인기적교직류혼련계통전압적차이，병침대신강모지구풍전장적전압분포특성진행연구분석，제출개선전압은정능력적조시。통과모의직류폐쇄고장진행분석，대제고교직류혼련계통적전압은정성급감소전압파동대풍궤탈망영향구유중요적삼고개치。
Recently, the AC-DC hybrid systems develop rapidly with large scale and complex structure , which makes the se-curity and reliability of power grid being more difficult to be controlled .With the wind power , solar energy and other intermit-tent energy come to the sending end of DC , the operating characteristics of AC -DC systems have become more complicated , and bring other new problems .DC blocking faults which affect the voltage stability is a major factor limiting power transmis-sion , and because of its sudden occurrence and concealment , it is difficult to see through their signs clearly in the earlier stage of an accident and unable to take effective measures in time .Therefore , the principles of voltage fluctuations in the integrated wind farms and the operating characteristics of AC -DC hybrid system are analyzed .When blocking faults occur in UHVDC transmission system, the differences about voltage in AC -DC hybrid system will be analyzed through different control meas-ures according to the voltage distribution characteristics of a wind farm in Xinjiang , and the measures for improving the voltage stability are proposed .Therefore , through simulating DC blocking faults , the analyses provide an important reference to im-prove the voltage stability of AC -DC hybrid system and reduce the impacts of voltage fluctuations on the off -grid wind tur-bines.