In high voltage input DC-DC converter, auxiliary winding of isolation transformer is usually used to supply power for control circuit. Due to the wide-range of input voltage, the variable output voltage of auxiliary w...In high voltage input DC-DC converter, auxiliary winding of isolation transformer is usually used to supply power for control circuit. Due to the wide-range of input voltage, the variable output voltage of auxiliary winding will cause a series of problems, such as variable drive pulse amplitude, increased driver switching devices loss and drive transformer core saturation. This paper analyzes the influence of variable output voltage of auxiliary winding in detail. A novel method is proposed to solve the problem of large variation range of auxiliary winding output voltage, which is adding a buck converter between the auxiliary winding and the control circuit. A dual switch forward convert has been designed with 300 V - 800 V input and 24 V/5 A output. The results show that this method is effective by comparing the different results of using buck converter or not.展开更多
针对常规备自投装置不能实现链式结构串供的多个110 k V变电站中非开环点变电站在失电时的快速恢复供电问题,提出了一种适用于常规和智能化变电站,基于区域电网实时全景信息的区域备自投新方案。具体介绍了区域备自投原理和实现方案,以...针对常规备自投装置不能实现链式结构串供的多个110 k V变电站中非开环点变电站在失电时的快速恢复供电问题,提出了一种适用于常规和智能化变电站,基于区域电网实时全景信息的区域备自投新方案。具体介绍了区域备自投原理和实现方案,以及其与站域备自投、常规备自投、区域保护、区域稳控的关系等。RTDS试验及现场工程应用表明,所提出的区域备自投性能优越,能够实现区域电网发生故障时的快速恢复供电。展开更多
为了保证直流输电工程换流站站用电设备安全稳定运行,必须合理设计站用电系统及备用电源自动投入装置的动作逻辑。以糯扎渡直流输电工程普洱换流站为例,根据主接线形式、运行要求和具体运行工况,对10 k V备自投的五种运行工况分别设计...为了保证直流输电工程换流站站用电设备安全稳定运行,必须合理设计站用电系统及备用电源自动投入装置的动作逻辑。以糯扎渡直流输电工程普洱换流站为例,根据主接线形式、运行要求和具体运行工况,对10 k V备自投的五种运行工况分别设计了备自投充放电逻辑和十三种动作投切逻辑,对400 V备自投单母分段运行方式设计了两种动作投切逻辑。同时,对备自投装置的定值整定原则及定值配合相关问题进行了研究,给出了推荐定值。所提出的备自投方案经现场实际运行证明:通过10 k V和400 V两级备自投装置的配合,在各种运行工况下某路或某两路站用电源失电时备自投装置都能快速动作投切至备用电源,无需降低直流输送功率或停运,大大提高了直流系统的可靠性。展开更多
文摘In high voltage input DC-DC converter, auxiliary winding of isolation transformer is usually used to supply power for control circuit. Due to the wide-range of input voltage, the variable output voltage of auxiliary winding will cause a series of problems, such as variable drive pulse amplitude, increased driver switching devices loss and drive transformer core saturation. This paper analyzes the influence of variable output voltage of auxiliary winding in detail. A novel method is proposed to solve the problem of large variation range of auxiliary winding output voltage, which is adding a buck converter between the auxiliary winding and the control circuit. A dual switch forward convert has been designed with 300 V - 800 V input and 24 V/5 A output. The results show that this method is effective by comparing the different results of using buck converter or not.
文摘针对常规备自投装置不能实现链式结构串供的多个110 k V变电站中非开环点变电站在失电时的快速恢复供电问题,提出了一种适用于常规和智能化变电站,基于区域电网实时全景信息的区域备自投新方案。具体介绍了区域备自投原理和实现方案,以及其与站域备自投、常规备自投、区域保护、区域稳控的关系等。RTDS试验及现场工程应用表明,所提出的区域备自投性能优越,能够实现区域电网发生故障时的快速恢复供电。
文摘为了保证直流输电工程换流站站用电设备安全稳定运行,必须合理设计站用电系统及备用电源自动投入装置的动作逻辑。以糯扎渡直流输电工程普洱换流站为例,根据主接线形式、运行要求和具体运行工况,对10 k V备自投的五种运行工况分别设计了备自投充放电逻辑和十三种动作投切逻辑,对400 V备自投单母分段运行方式设计了两种动作投切逻辑。同时,对备自投装置的定值整定原则及定值配合相关问题进行了研究,给出了推荐定值。所提出的备自投方案经现场实际运行证明:通过10 k V和400 V两级备自投装置的配合,在各种运行工况下某路或某两路站用电源失电时备自投装置都能快速动作投切至备用电源,无需降低直流输送功率或停运,大大提高了直流系统的可靠性。