中国电机工程学报
中國電機工程學報
중국전궤공정학보
ZHONGGUO DIANJI GONGCHENG XUEBAO
2015年
12期
3026-3036
,共11页
直流配电%故障分析%故障限流%故障隔离%超导限流器
直流配電%故障分析%故障限流%故障隔離%超導限流器
직류배전%고장분석%고장한류%고장격리%초도한류기
DC distribution system%fault analysis%fault limiting%fault isolation%superconducting fault current limiter
直流配电系统的故障隔离是保障直流系统供电可靠性的关键技术。分析直流配电系统直流故障时的暂态特性，指出故障持续过程中直流电容放电、续流二极管自然换向导通和二极管同时导通三个阶段对交流系统、换流器以及直流侧的影响，并以此为依据提出直流系统故障隔离对保护和直流断路器动作的技术要求和难点。提出基于电阻型超导限流器的直流故障限流方法，对直流线路、交流系统和换流器内部续流二极管均可起到限流作用，从而降低直流系统对直流故障保护方案的速动性要求和设计难度，同时也降低对直流断路器的动作时间和开断容量要求。利用 Matlab/Simulink 对直流配电系统短路故障进行仿真测试，验证了直流系统的故障暂态特征和所提限流方法的有效性。
直流配電繫統的故障隔離是保障直流繫統供電可靠性的關鍵技術。分析直流配電繫統直流故障時的暫態特性，指齣故障持續過程中直流電容放電、續流二極管自然換嚮導通和二極管同時導通三箇階段對交流繫統、換流器以及直流側的影響，併以此為依據提齣直流繫統故障隔離對保護和直流斷路器動作的技術要求和難點。提齣基于電阻型超導限流器的直流故障限流方法，對直流線路、交流繫統和換流器內部續流二極管均可起到限流作用，從而降低直流繫統對直流故障保護方案的速動性要求和設計難度，同時也降低對直流斷路器的動作時間和開斷容量要求。利用 Matlab/Simulink 對直流配電繫統短路故障進行倣真測試，驗證瞭直流繫統的故障暫態特徵和所提限流方法的有效性。
직류배전계통적고장격리시보장직류계통공전가고성적관건기술。분석직류배전계통직류고장시적잠태특성，지출고장지속과정중직류전용방전、속류이겁관자연환향도통화이겁관동시도통삼개계단대교류계통、환류기이급직류측적영향，병이차위의거제출직류계통고장격리대보호화직류단로기동작적기술요구화난점。제출기우전조형초도한류기적직류고장한류방법，대직류선로、교류계통화환류기내부속류이겁관균가기도한류작용，종이강저직류계통대직류고장보호방안적속동성요구화설계난도，동시야강저대직류단로기적동작시간화개단용량요구。이용 Matlab/Simulink 대직류배전계통단로고장진행방진측시，험증료직류계통적고장잠태특정화소제한류방법적유효성。
The isolation of the DC faults is the key technology for guaranteeing the supply reliability in the DC distribution system. This paper analyzed the transient characteristics of DC faults, and subdivided the transient process into three stages:the DC capacitor discharge stage, the diodes natural commutation conduct stage and the diodes synchronously conduct stage. The paper pointed out that the DC faults will affect the AC side, the converter and the DC side. According to the DC faults transient process, this paper analyzed the requirements and technology difficulties of the protection strategy and DC circuit breakers for the DC distribution system. Then this paper proposed a fault current limiting technique based on the resistive-type superconducting fault current limiter (R-SFCL) which can limit the overcurrent of the DC side, AC side and the anti-parallel diodes when the DC fault happens. Therefore, it can decrease the requirements of the action time and design difficulties for the protection strategy, and decrease the requirement of action speed and interrupting capacity for the DC circuit breaker. Finally, this paper carried out lots of simulation tests to verify the effectiveness of the theoretical analysis and proposed fault current limiting technique based on the Matlab/Simulink.
