中国电机工程学报
中國電機工程學報
중국전궤공정학보
ZHONGGUO DIANJI GONGCHENG XUEBAO
2014年
34期
6141-6149
,共9页
郑超%马世英%盛灿辉%郭小江%杨海涛%傅旭%刘洪涛%林俊杰%秦晓辉%刘道伟
鄭超%馬世英%盛燦輝%郭小江%楊海濤%傅旭%劉洪濤%林俊傑%秦曉輝%劉道偉
정초%마세영%성찬휘%곽소강%양해도%부욱%류홍도%림준걸%진효휘%류도위
逆变站%动态无功特性%电压稳定%逆变器%容性补偿器%受扰轨迹%控制判据%紧急控制策略
逆變站%動態無功特性%電壓穩定%逆變器%容性補償器%受擾軌跡%控製判據%緊急控製策略
역변참%동태무공특성%전압은정%역변기%용성보상기%수우궤적%공제판거%긴급공제책략
inverter station%dynamic reactive power characteristic%voltage stability%inverter%capacitive compensator%disturbed trajectory%control criterion%emergency control strategy
受特高压直流送电容量大、多直流密集落点以及负荷高密度分布等因素影响，受端电压稳定问题已成为威胁电网安全稳定运行和制约负荷接纳能力的重要因素之一。通过逆变器准稳态模型，解析其无功消耗与送电有功间的强关联特征；通过时域仿真，明晰逆变器无功消耗与容性补偿器无功出力动态差异，明确该差异可使逆变站成为动态无功源，即直流有功回降后逆变站可向交流电网注入动态无功。在此基础上，提出改善受端电网电压稳定性的直流紧急控制启动判据和撤销判据，以及具备在线应用前景的基于逆变站换流母线电压受扰轨迹的直流紧急控制策略。呼盟—豫西±800 kV/8000 MW 特高压直流受端电网大扰动时域仿真结果，证实了所提控制策略是提升受端电网电压稳定性和规避切负荷的经济有效措施。
受特高壓直流送電容量大、多直流密集落點以及負荷高密度分佈等因素影響，受耑電壓穩定問題已成為威脅電網安全穩定運行和製約負荷接納能力的重要因素之一。通過逆變器準穩態模型，解析其無功消耗與送電有功間的彊關聯特徵；通過時域倣真，明晰逆變器無功消耗與容性補償器無功齣力動態差異，明確該差異可使逆變站成為動態無功源，即直流有功迴降後逆變站可嚮交流電網註入動態無功。在此基礎上，提齣改善受耑電網電壓穩定性的直流緊急控製啟動判據和撤銷判據，以及具備在線應用前景的基于逆變站換流母線電壓受擾軌跡的直流緊急控製策略。呼盟—豫西±800 kV/8000 MW 特高壓直流受耑電網大擾動時域倣真結果，證實瞭所提控製策略是提升受耑電網電壓穩定性和規避切負荷的經濟有效措施。
수특고압직류송전용량대、다직류밀집낙점이급부하고밀도분포등인소영향，수단전압은정문제이성위위협전망안전은정운행화제약부하접납능력적중요인소지일。통과역변기준은태모형，해석기무공소모여송전유공간적강관련특정；통과시역방진，명석역변기무공소모여용성보상기무공출력동태차이，명학해차이가사역변참성위동태무공원，즉직류유공회강후역변참가향교류전망주입동태무공。재차기출상，제출개선수단전망전압은정성적직류긴급공제계동판거화철소판거，이급구비재선응용전경적기우역변참환류모선전압수우궤적적직류긴급공제책략。호맹—예서±800 kV/8000 MW 특고압직류수단전망대우동시역방진결과，증실료소제공제책략시제승수단전망전압은정성화규피절부하적경제유효조시。
Due to the transmission capacity of ultra high-voltage direct current (UHVDC) increasing, intensive HVDC inverter stations located and load high-density accessing, voltage stability has become one of the important factors of threating to the security and restricting the ability to accept loads for the receiving end power grid. In this paper, the relationship between reactive power and active power was analyzed based on the quasi-steady-state analytical equations of inverter firstly. Time domain simulations show the dynamic difference between inverter consumption and capacitor bank exportation of the capacitive reactive power, so the inverter station can be as dynamic reactive power source to improve the voltage stability of the receiving end power grid by HVDC power backing down. The start criterion and the revocation criterion of HVDC emergency power control were put forward, and based on the disturbed trajectory of commutation bus voltage at inverter station, the control strategy with online application prospects was also proposed. Large disturbance time-domain simulation results got from the receiving end power grid of Humeng-Yuxi ±800 kV/8 000 MW UHVDC transmission system verified the recommended control strategy is a cost-effective measure to enhance the voltage stability level and to circumvent load shedding.
