The highpower pulsed power supply system for the magnetic field of the HL-2A Tokamak is described in this paper. The total output power of its eight magnetic field power supply units of nearly 250 MW. Their highest DC...The highpower pulsed power supply system for the magnetic field of the HL-2A Tokamak is described in this paper. The total output power of its eight magnetic field power supply units of nearly 250 MW. Their highest DC output voltage and current are 3510 V and 45 kA, respectively. All the units are operated in a pulsed mode. The pulse duration is 5 s, and the cyclic period is 15 min. The power supply system consists mainly of pulsed flywheel motor generators, rectifying transformers, thyristor converters, diode rectifiers and switches. The system incorporates many key technologies-supply equalization with two generators and four diode bridges, constant-angle phase triggers with a wide frequency range, current equalization, a status detector for the high current 6-phase converter, and advanced monitoring based on a programmable logic computer and engineering parameter measurement. The experimental results show that the performance of the power supply system satisfies the requirements of HL-2A experiments very well.展开更多
不间断电源(uninterrupted power supply,UPS)是电力系统电能质量问题的重要解决方案,环流抑制问题是目前多台UPS并联技术中的研究重点与难点.基于CAN总线的模块化UPS并联控制策略,应用虚拟多回路输出阻抗下垂控制,并采用CAN总线通信实...不间断电源(uninterrupted power supply,UPS)是电力系统电能质量问题的重要解决方案,环流抑制问题是目前多台UPS并联技术中的研究重点与难点.基于CAN总线的模块化UPS并联控制策略,应用虚拟多回路输出阻抗下垂控制,并采用CAN总线通信实现各并联UPS模块间的同步和均流控制.实验结果表明,提出的方法在抑制子模块环流的同时解决了分布式系统的信号稳定性问题,保证了模块化UPS并联系统数据传输的准确性和实时性.展开更多
在高功率超导磁储能装置(superconducting magnetic energy storage,SMES)中,电压源型功率调节系统首先利用多相斩波器将超导磁体电流转化成稳定的直流电压,再利用后级电压源型变流器(voltage source converter,VSC)与交流系统交换功率...在高功率超导磁储能装置(superconducting magnetic energy storage,SMES)中,电压源型功率调节系统首先利用多相斩波器将超导磁体电流转化成稳定的直流电压,再利用后级电压源型变流器(voltage source converter,VSC)与交流系统交换功率。当SMES与电网交换功率快速大幅变化时,传统自均流PI法控制的多相斩波器存在直流电压偏移和相间暂时不均流的问题。直流电压的偏移会进一步影响后级VSC功率交换的控制精度及速度。为克服上述问题,该文导出了多相斩波器开关函数模型,并基于该模型提出一种矢量切换控制方法。该方法使用滞环规律切换控制矢量,实现直流电压的控制,并利用控制矢量冗余的开关组合实现均流。仿真分析表明,该文方法可基本消除交换功率突变时直流电压的偏移,从而为后级VSC的快速准确控制提供有利条件。此外,所提方法能够实现斩波器在多种工况下良好均流,保证长期运行的可靠性。展开更多
本文设计了一种高频融冰大功率激励电源模块化结构。输入侧应用多重化PWM可控整流和功率单元输入载波相移技术,对输入谐波和功率因数控制;组合逆变器采用相移SPWM技术以克服大功率开关器件开关频率低无法输出高频的难点,并采用输入均压...本文设计了一种高频融冰大功率激励电源模块化结构。输入侧应用多重化PWM可控整流和功率单元输入载波相移技术,对输入谐波和功率因数控制;组合逆变器采用相移SPWM技术以克服大功率开关器件开关频率低无法输出高频的难点,并采用输入均压、输出均流的控制策略,各单元间通过均压、均流母线相互通信,抑制了功率单元并联结构产生的环流。搭建的融冰电源仿真试验结果表明:该融冰激励源输出频率可达到40 k Hz,输出电压稳定,谐波含量少,控制方便,为输电线路新型融冰装置研发提供了技术参考。展开更多
文摘The highpower pulsed power supply system for the magnetic field of the HL-2A Tokamak is described in this paper. The total output power of its eight magnetic field power supply units of nearly 250 MW. Their highest DC output voltage and current are 3510 V and 45 kA, respectively. All the units are operated in a pulsed mode. The pulse duration is 5 s, and the cyclic period is 15 min. The power supply system consists mainly of pulsed flywheel motor generators, rectifying transformers, thyristor converters, diode rectifiers and switches. The system incorporates many key technologies-supply equalization with two generators and four diode bridges, constant-angle phase triggers with a wide frequency range, current equalization, a status detector for the high current 6-phase converter, and advanced monitoring based on a programmable logic computer and engineering parameter measurement. The experimental results show that the performance of the power supply system satisfies the requirements of HL-2A experiments very well.
文摘不间断电源(uninterrupted power supply,UPS)是电力系统电能质量问题的重要解决方案,环流抑制问题是目前多台UPS并联技术中的研究重点与难点.基于CAN总线的模块化UPS并联控制策略,应用虚拟多回路输出阻抗下垂控制,并采用CAN总线通信实现各并联UPS模块间的同步和均流控制.实验结果表明,提出的方法在抑制子模块环流的同时解决了分布式系统的信号稳定性问题,保证了模块化UPS并联系统数据传输的准确性和实时性.
文摘在高功率超导磁储能装置(superconducting magnetic energy storage,SMES)中,电压源型功率调节系统首先利用多相斩波器将超导磁体电流转化成稳定的直流电压,再利用后级电压源型变流器(voltage source converter,VSC)与交流系统交换功率。当SMES与电网交换功率快速大幅变化时,传统自均流PI法控制的多相斩波器存在直流电压偏移和相间暂时不均流的问题。直流电压的偏移会进一步影响后级VSC功率交换的控制精度及速度。为克服上述问题,该文导出了多相斩波器开关函数模型,并基于该模型提出一种矢量切换控制方法。该方法使用滞环规律切换控制矢量,实现直流电压的控制,并利用控制矢量冗余的开关组合实现均流。仿真分析表明,该文方法可基本消除交换功率突变时直流电压的偏移,从而为后级VSC的快速准确控制提供有利条件。此外,所提方法能够实现斩波器在多种工况下良好均流,保证长期运行的可靠性。
文摘本文设计了一种高频融冰大功率激励电源模块化结构。输入侧应用多重化PWM可控整流和功率单元输入载波相移技术,对输入谐波和功率因数控制;组合逆变器采用相移SPWM技术以克服大功率开关器件开关频率低无法输出高频的难点,并采用输入均压、输出均流的控制策略,各单元间通过均压、均流母线相互通信,抑制了功率单元并联结构产生的环流。搭建的融冰电源仿真试验结果表明:该融冰激励源输出频率可达到40 k Hz,输出电压稳定,谐波含量少,控制方便,为输电线路新型融冰装置研发提供了技术参考。
