鉴于王庄煤矿变电所35kV/6kV变电所负荷工作时功率因数较低、所需滤波装置容量较大的特点,将无源电力滤波器(Passive Power Filter,PPF)与有源电力滤波器(Active Power Filter,APF)相结合,来滤除6kV侧电网的谐波污染,同时进行无功补偿...鉴于王庄煤矿变电所35kV/6kV变电所负荷工作时功率因数较低、所需滤波装置容量较大的特点,将无源电力滤波器(Passive Power Filter,PPF)与有源电力滤波器(Active Power Filter,APF)相结合,来滤除6kV侧电网的谐波污染,同时进行无功补偿。本文系统地分析了煤矿变电所负载工作时谐波产生的原因、电网阻抗及频率摄动对滤波效果的影响,并给出了相应的混合滤波装置(Hybrid Active Power Filter,HAPF)治理方案。对变电所6kV母线谐波电流的测量结果验证了所给出方案的可行性与有效性。展开更多
阐述了铜矿变电所负载工作时谐波产生的原因,提出将无源电力滤波器(Passive Power Filter,PPF)与有源电力滤波器(Active Power Filter,APF)相结合,来滤除铜矿6 kV侧电网的谐波污染,同时进行无功补偿。考虑电网电抗与频率的摄动,在设计...阐述了铜矿变电所负载工作时谐波产生的原因,提出将无源电力滤波器(Passive Power Filter,PPF)与有源电力滤波器(Active Power Filter,APF)相结合,来滤除铜矿6 kV侧电网的谐波污染,同时进行无功补偿。考虑电网电抗与频率的摄动,在设计无源滤波装置时对其参数进行摄动分析.并通过对变电所6 kV母线谐波电流的测量结果验证了方案的可行性与有效性。展开更多
Electron spin-polarization modulation with a ferromagnetic strip of in-plane magnetization is analyzed in a hybrid ferromagnet/semiconductor filter device.The dependencies of electron spin-polarization on the strip’s...Electron spin-polarization modulation with a ferromagnetic strip of in-plane magnetization is analyzed in a hybrid ferromagnet/semiconductor filter device.The dependencies of electron spin-polarization on the strip’s magnetization strength,width and position have been systematically investigated.A novel magnetic control spin-polarization switch is proposed by inserting a ferromagnetic metal(FM)strip eccentric in relation to off the center of the spin filter,which produces the first energy level spin-polarization reversal.It is believed to be of significant importance for the realization of semiconductor spintronics multiple-value logic devices.展开更多
文摘鉴于王庄煤矿变电所35kV/6kV变电所负荷工作时功率因数较低、所需滤波装置容量较大的特点,将无源电力滤波器(Passive Power Filter,PPF)与有源电力滤波器(Active Power Filter,APF)相结合,来滤除6kV侧电网的谐波污染,同时进行无功补偿。本文系统地分析了煤矿变电所负载工作时谐波产生的原因、电网阻抗及频率摄动对滤波效果的影响,并给出了相应的混合滤波装置(Hybrid Active Power Filter,HAPF)治理方案。对变电所6kV母线谐波电流的测量结果验证了所给出方案的可行性与有效性。
文摘阐述了铜矿变电所负载工作时谐波产生的原因,提出将无源电力滤波器(Passive Power Filter,PPF)与有源电力滤波器(Active Power Filter,APF)相结合,来滤除铜矿6 kV侧电网的谐波污染,同时进行无功补偿。考虑电网电抗与频率的摄动,在设计无源滤波装置时对其参数进行摄动分析.并通过对变电所6 kV母线谐波电流的测量结果验证了方案的可行性与有效性。
基金supported by the National Basic Research Program of China(Grant No.2013CB934003)the State Key Laboratory of Software Development Environment(Grant No.SKLSDE-2013ZX-28)
文摘Electron spin-polarization modulation with a ferromagnetic strip of in-plane magnetization is analyzed in a hybrid ferromagnet/semiconductor filter device.The dependencies of electron spin-polarization on the strip’s magnetization strength,width and position have been systematically investigated.A novel magnetic control spin-polarization switch is proposed by inserting a ferromagnetic metal(FM)strip eccentric in relation to off the center of the spin filter,which produces the first energy level spin-polarization reversal.It is believed to be of significant importance for the realization of semiconductor spintronics multiple-value logic devices.