In this paper, a strategy for the reactive power compensation and harmonic suppression of the power supply system in HT-7U superconductive Tokamak is proposed. The optimized approach is given in the parameters design...In this paper, a strategy for the reactive power compensation and harmonic suppression of the power supply system in HT-7U superconductive Tokamak is proposed. The optimized approach is given in the parameters design for passive filter. Also a controlling method with fast response time and good accuracy is put forward for the compensator, which is more suitable for the dynamic load.展开更多
A 33.5 m, 35 kV/121 MVA, three-phase, warm dielectric HTS power cable system was successfully installed and activated in China Southern Power Grid at the Puji substation in Kunming on April 19th of 2004, supplying ele...A 33.5 m, 35 kV/121 MVA, three-phase, warm dielectric HTS power cable system was successfully installed and activated in China Southern Power Grid at the Puji substation in Kunming on April 19th of 2004, supplying electricity to four industrial customers （including two metallurgical refineries） and a residential population of about 100000. In this paper, we give an update on the operation and maintenance status of the system and comments on reliability issues. We conclude that the superconducting cable system is currently quite robust and feasible for particular utility applications, and it will be improved by advancement in cryogenic equipment and system technology.展开更多
In order to carry on ECRH experiments and research on HL-2A tokamak, two sets of 4 mm gyrotrons were imported from GYCOM. Each of them has a superconducting magnet system to offer a required magnetic field configurati...In order to carry on ECRH experiments and research on HL-2A tokamak, two sets of 4 mm gyrotrons were imported from GYCOM. Each of them has a superconducting magnet system to offer a required magnetic field configuration. In gyrotron, a strong magnetic field is necessary for electron beam to satisfy the electron cyclotron resonance condition and to excite one the eigemodes in the cavity. Its functions are： （I） to make electrons gyrate, （ 2 ） to offer enough adiabatic compression value to make electrons acquire strong transverse energy. During the period of adjustment, magnetic field distribution was measured. Meanwhile, operating current of superconducting magnet and operating frequency of gyrotron were determined.展开更多
Purpose This paper describes the design of power supply system for superconducting wiggler in the project of high energy photon source-test facility.It includes three sets of high precision DC stabilized current power...Purpose This paper describes the design of power supply system for superconducting wiggler in the project of high energy photon source-test facility.It includes three sets of high precision DC stabilized current power supplies for superconducting magnet excitation and three sets of quench protection assembly(QPA).A special magnetic load which has a very large time constant is studied in this paper.In this paper,a stable superconducting excitation power supply is developed,which can adjust the response quickly under the condition of very large load time constant.Meanwhile,the energy dissipation circuit of the QPA is integrated into the power supply in an active quenching protection mode to accelerate the energy release of the superconducting magnet and protect the superconducting magnet.Method The main circuit topology,control algorithm,quenching protection circuit and interlocking logic function are designed for the superconducting magnet with large inductance.The upper computer controls the switch of the three main power circuits through the serial port,sets the output current and adjusts the parameters according to the load.Conclusion Through a series of scientific and rigorous experiments,the rationality of superconducting wiggler magnet power supply scheme is demonstrated.The output current stability test and output voltage ripple test of the power supply meet or exceed the requirements of the magnet system.展开更多
文摘In this paper, a strategy for the reactive power compensation and harmonic suppression of the power supply system in HT-7U superconductive Tokamak is proposed. The optimized approach is given in the parameters design for passive filter. Also a controlling method with fast response time and good accuracy is put forward for the compensator, which is more suitable for the dynamic load.
基金This work was supported in part by the Chinese Ministry of Science and Technology under Grant No. 2002AA306154, 2004AA306110,2005AA306120 and 2006AA03Z207the Beijing Municipal Scienceand Technology Commission under Grant No. H020420010210the Yunnan Provincial Science and Technology Department under Grant No.2003BABCA05A041 and 2003530101000415.
文摘A 33.5 m, 35 kV/121 MVA, three-phase, warm dielectric HTS power cable system was successfully installed and activated in China Southern Power Grid at the Puji substation in Kunming on April 19th of 2004, supplying electricity to four industrial customers （including two metallurgical refineries） and a residential population of about 100000. In this paper, we give an update on the operation and maintenance status of the system and comments on reliability issues. We conclude that the superconducting cable system is currently quite robust and feasible for particular utility applications, and it will be improved by advancement in cryogenic equipment and system technology.
文摘In order to carry on ECRH experiments and research on HL-2A tokamak, two sets of 4 mm gyrotrons were imported from GYCOM. Each of them has a superconducting magnet system to offer a required magnetic field configuration. In gyrotron, a strong magnetic field is necessary for electron beam to satisfy the electron cyclotron resonance condition and to excite one the eigemodes in the cavity. Its functions are： （I） to make electrons gyrate, （ 2 ） to offer enough adiabatic compression value to make electrons acquire strong transverse energy. During the period of adjustment, magnetic field distribution was measured. Meanwhile, operating current of superconducting magnet and operating frequency of gyrotron were determined.
文摘Purpose This paper describes the design of power supply system for superconducting wiggler in the project of high energy photon source-test facility.It includes three sets of high precision DC stabilized current power supplies for superconducting magnet excitation and three sets of quench protection assembly(QPA).A special magnetic load which has a very large time constant is studied in this paper.In this paper,a stable superconducting excitation power supply is developed,which can adjust the response quickly under the condition of very large load time constant.Meanwhile,the energy dissipation circuit of the QPA is integrated into the power supply in an active quenching protection mode to accelerate the energy release of the superconducting magnet and protect the superconducting magnet.Method The main circuit topology,control algorithm,quenching protection circuit and interlocking logic function are designed for the superconducting magnet with large inductance.The upper computer controls the switch of the three main power circuits through the serial port,sets the output current and adjusts the parameters according to the load.Conclusion Through a series of scientific and rigorous experiments,the rationality of superconducting wiggler magnet power supply scheme is demonstrated.The output current stability test and output voltage ripple test of the power supply meet or exceed the requirements of the magnet system.
