随着交直流电网规模的不断增长,纯电阻型超导限流器已经难以满足其限流需求。为了减少超导带材的用量并提高电阻型超导限流器的经济性,通过引入空芯分裂电抗器,研究了一种分裂电抗型超导限流器（DRSFCL）并对其基本限流原理进行了分析...随着交直流电网规模的不断增长,纯电阻型超导限流器已经难以满足其限流需求。为了减少超导带材的用量并提高电阻型超导限流器的经济性,通过引入空芯分裂电抗器,研究了一种分裂电抗型超导限流器（DRSFCL）并对其基本限流原理进行了分析。通过建模和仿真研究,主要分析了DRSFCL在10 k V电压下的交直流限流特性,得到其在交流冲击下可有效地限制短路电流的第一波峰值,限流作用比较明显,且在直流冲击下也有较好的限流作用。最后通过直流冲击平台对部分直流仿真结果进行了试验验证,试验结果与仿真结果基本一致。展开更多
Environmental issues associated with the aviation industry are getting more attention as air traffic increases.Stringent standards are imposed for fuel consumption and pollution emissions for next-generation aircraft....Environmental issues associated with the aviation industry are getting more attention as air traffic increases.Stringent standards are imposed for fuel consumption and pollution emissions for next-generation aircraft.Superconducting electrical propulsion aircraft(SEPA)have been seen as an efficient way to achieve this goal.High-temperature superconducting(HTS)devices are extensively used in the power system to supply enormous energy.Power is distributed to the different loads via a DC distribution network.However,it will generate an inrush current over ten times higher than the rated current in short-circuit state,which is very harmful to the system.Therefore,it is essential to adopt an appropriate protection scheme.This paper discusses one protection scheme that combines DC vacuum circuit breakers(DC VCB)and resistive superconducting current limiters(RSFCL)for superconducting aircraft applications.Considering problems of cost and loss,the auxiliary capacitor is pre-charged by system voltage,and mechanical elements extinguish the arc.Furthermore,combined with RSFCL,the interrupting environment is fully improved.RSFCL limits fault current,and then the VCB breaks this limited current based on creating an artificial current zero(ACZ).The prospective rated power is 8MW,rated voltage and current are 4 kV and 1 kA,respectively.In this paper,we discuss and simulate switching devices that protect SEPA.The interrupting performance of the circuit breaker is analysed in the DC short-circuit fault that occurs on the transmission line.Finally,the residual energy consumption of different situations is calculated.A comparison is made between using RSFCL with metal oxide varistor(MOV)and just using MOV.The scheme with RSFCL shows a significant advantage in energy consumption.展开更多
文摘随着交直流电网规模的不断增长,纯电阻型超导限流器已经难以满足其限流需求。为了减少超导带材的用量并提高电阻型超导限流器的经济性,通过引入空芯分裂电抗器,研究了一种分裂电抗型超导限流器（DRSFCL）并对其基本限流原理进行了分析。通过建模和仿真研究,主要分析了DRSFCL在10 k V电压下的交直流限流特性,得到其在交流冲击下可有效地限制短路电流的第一波峰值,限流作用比较明显,且在直流冲击下也有较好的限流作用。最后通过直流冲击平台对部分直流仿真结果进行了试验验证,试验结果与仿真结果基本一致。
基金supported by the 2022 Open funding of the State Key Laboratory of Electrical Insulation and Power Equipment(EIPE22211)the National Natural Science Foundation of China,“Research Fund for International Young Scientist(RFIS-1)”,Project:52150410419the 2021 Jiangsu“Shuang-Chuang Doctor(Mass Innovation and Entrepreneurship)Talent Program”,Fund:JSSCBS20211187.
文摘Environmental issues associated with the aviation industry are getting more attention as air traffic increases.Stringent standards are imposed for fuel consumption and pollution emissions for next-generation aircraft.Superconducting electrical propulsion aircraft(SEPA)have been seen as an efficient way to achieve this goal.High-temperature superconducting(HTS)devices are extensively used in the power system to supply enormous energy.Power is distributed to the different loads via a DC distribution network.However,it will generate an inrush current over ten times higher than the rated current in short-circuit state,which is very harmful to the system.Therefore,it is essential to adopt an appropriate protection scheme.This paper discusses one protection scheme that combines DC vacuum circuit breakers(DC VCB)and resistive superconducting current limiters(RSFCL)for superconducting aircraft applications.Considering problems of cost and loss,the auxiliary capacitor is pre-charged by system voltage,and mechanical elements extinguish the arc.Furthermore,combined with RSFCL,the interrupting environment is fully improved.RSFCL limits fault current,and then the VCB breaks this limited current based on creating an artificial current zero(ACZ).The prospective rated power is 8MW,rated voltage and current are 4 kV and 1 kA,respectively.In this paper,we discuss and simulate switching devices that protect SEPA.The interrupting performance of the circuit breaker is analysed in the DC short-circuit fault that occurs on the transmission line.Finally,the residual energy consumption of different situations is calculated.A comparison is made between using RSFCL with metal oxide varistor(MOV)and just using MOV.The scheme with RSFCL shows a significant advantage in energy consumption.
