A feedback control system is needed to restrain plasma vertical displacement in EAST （Experimental Advanced Superconducting Toknmak）. A fast control power supply excites active feedback coils, which produces a magne...A feedback control system is needed to restrain plasma vertical displacement in EAST （Experimental Advanced Superconducting Toknmak）. A fast control power supply excites active feedback coils, which produces a magnetic field to control the plasma＇s displacement. With the development of EAST, new demands on the new fast control power supply have led to an enhanced ability of fast response and output current, as well as a new control mode. The structure of cascaded and paralleled H-bridges can meet the demand of extended capacity, and digital control can reMize current and voltage mixed control mode. The validity of the proposed scheme is confirmed by experiments.展开更多
The effectiveness of the magnetic confinement of plasma can be improved by elongat- ing the plasma cross-section in tokamak devices. But elongated plasma has vertical displacement instability, so a feedback control sy...The effectiveness of the magnetic confinement of plasma can be improved by elongat- ing the plasma cross-section in tokamak devices. But elongated plasma has vertical displacement instability, so a feedback control system is needed to restrain the plasma＇s vertical displacement. A fast control power supply is needed to excite the active feedback coils, which produces a magnetic field to control the plasma＇s displacement. With the development of EAST, the fast control power supply needs to keep on enhancing the fast response and output current. The structure of a new power supply is introduced in this paper. The method of multiple inverters paralleled with the current sharing reactor is presented to meet the need for large current and fast control. According to the design demands of the EAST fast control power supply, the adjuster of the current close loop is applied to the inverter, which can advance its ability to restrain the loop current in low frequency and DC output. The result of the experiment confirms the validity of the proposed scheme and control strategy.展开更多
装设故障限流装置是解决日益严重电网短路电流超标问题的有效技术措施之一,利用智能快速开关技术、短路电流过零点快速预测及精确相控开断技术研制一套330 k V开关型零损耗电网故障限流装置。该装置采用模块化设计方法,使正常运行时损...装设故障限流装置是解决日益严重电网短路电流超标问题的有效技术措施之一,利用智能快速开关技术、短路电流过零点快速预测及精确相控开断技术研制一套330 k V开关型零损耗电网故障限流装置。该装置采用模块化设计方法,使正常运行时损耗为零,且短路故障发生20 ms内,则可将80 k A及以下的短路电流限制在系统断路器的安全开断水平,从而实现任意深度的故障限流;装置成功用在330 k V线路上,通过带电、挂网运行和2次人工单相瞬时短路试验,验证装置满足安全性、有效性和可靠性的要求,同时结构简单合理,成本低廉且占地面积小。展开更多
基金supported by ITER Program of China(973 Program)(No.2011GB109002)National Natural Science Foundation of China(No.11275056)Hefei University of Technology Doctor Research Foundation of China(No.2011HGBZ1292)
文摘A feedback control system is needed to restrain plasma vertical displacement in EAST （Experimental Advanced Superconducting Toknmak）. A fast control power supply excites active feedback coils, which produces a magnetic field to control the plasma＇s displacement. With the development of EAST, new demands on the new fast control power supply have led to an enhanced ability of fast response and output current, as well as a new control mode. The structure of cascaded and paralleled H-bridges can meet the demand of extended capacity, and digital control can reMize current and voltage mixed control mode. The validity of the proposed scheme is confirmed by experiments.
基金supported in part by the ITER Program of China(973 Program)(No.2011GB109002)National Natural Science Foundation of China(No.11275056)
文摘The effectiveness of the magnetic confinement of plasma can be improved by elongat- ing the plasma cross-section in tokamak devices. But elongated plasma has vertical displacement instability, so a feedback control system is needed to restrain the plasma＇s vertical displacement. A fast control power supply is needed to excite the active feedback coils, which produces a magnetic field to control the plasma＇s displacement. With the development of EAST, the fast control power supply needs to keep on enhancing the fast response and output current. The structure of a new power supply is introduced in this paper. The method of multiple inverters paralleled with the current sharing reactor is presented to meet the need for large current and fast control. According to the design demands of the EAST fast control power supply, the adjuster of the current close loop is applied to the inverter, which can advance its ability to restrain the loop current in low frequency and DC output. The result of the experiment confirms the validity of the proposed scheme and control strategy.
文摘装设故障限流装置是解决日益严重电网短路电流超标问题的有效技术措施之一,利用智能快速开关技术、短路电流过零点快速预测及精确相控开断技术研制一套330 k V开关型零损耗电网故障限流装置。该装置采用模块化设计方法,使正常运行时损耗为零,且短路故障发生20 ms内,则可将80 k A及以下的短路电流限制在系统断路器的安全开断水平,从而实现任意深度的故障限流;装置成功用在330 k V线路上,通过带电、挂网运行和2次人工单相瞬时短路试验,验证装置满足安全性、有效性和可靠性的要求,同时结构简单合理,成本低廉且占地面积小。
