为在设计阶段对大功率中频变压器漏感值进行准确法估算,基于中频变压器一维等效模型,根据漏磁场分布特征,通过能量法进行了变压器漏感参数解析公式推导。在此基础上,根据理想漏磁场模型与实际的差异,修正了解析公式中绕组的电导率与漏...为在设计阶段对大功率中频变压器漏感值进行准确法估算,基于中频变压器一维等效模型,根据漏磁场分布特征,通过能量法进行了变压器漏感参数解析公式推导。在此基础上,根据理想漏磁场模型与实际的差异,修正了解析公式中绕组的电导率与漏磁场的计算高度。通过比较两台样机在50 Hz^10 k Hz频段下的漏感实测与计算结果,证实了对这2个参数同时进行校正,可使变压器漏感计算误差减小到5%以内,并进一步分析了仍然存在的误差产生的原因。通过样机1与样机2的漏感值对比,证明了绕组交叉换位技术可有效减小变压器漏感。展开更多
There is no common accepted way for calculating the valve power loss of modular multilevel converter(MMC).Valve power loss estimation based on analytical calculation is inaccurate to address the switching power loss a...There is no common accepted way for calculating the valve power loss of modular multilevel converter(MMC).Valve power loss estimation based on analytical calculation is inaccurate to address the switching power loss and valve power loss estimation based on detailed electro-magnetic simulation is of low speed.To solve this problem,a method of valve power loss estimation based on the detailed equivalent simulation model of MMC is proposed.Results of valve power loss analysis of 201-level 500MW MMC operating at 50Hz~1000Hz are presented.It is seen that the valve power loss of a MMC increased by 12,40 and 93%under 200Hz,500Hz and 1000Hz operating frequency.The article concludes that in a device with isolated inner AC system,MMC operating at higher frequency will be more competitive than typical 50Hz/60Hz MMC with moderate increase of operating power loss and significant reduction of the size of the AC components.展开更多
文摘为在设计阶段对大功率中频变压器漏感值进行准确法估算,基于中频变压器一维等效模型,根据漏磁场分布特征,通过能量法进行了变压器漏感参数解析公式推导。在此基础上,根据理想漏磁场模型与实际的差异,修正了解析公式中绕组的电导率与漏磁场的计算高度。通过比较两台样机在50 Hz^10 k Hz频段下的漏感实测与计算结果,证实了对这2个参数同时进行校正,可使变压器漏感计算误差减小到5%以内,并进一步分析了仍然存在的误差产生的原因。通过样机1与样机2的漏感值对比,证明了绕组交叉换位技术可有效减小变压器漏感。
基金supported by the PowerChina Hubei Electric Engineering Corporation。
文摘There is no common accepted way for calculating the valve power loss of modular multilevel converter(MMC).Valve power loss estimation based on analytical calculation is inaccurate to address the switching power loss and valve power loss estimation based on detailed electro-magnetic simulation is of low speed.To solve this problem,a method of valve power loss estimation based on the detailed equivalent simulation model of MMC is proposed.Results of valve power loss analysis of 201-level 500MW MMC operating at 50Hz~1000Hz are presented.It is seen that the valve power loss of a MMC increased by 12,40 and 93%under 200Hz,500Hz and 1000Hz operating frequency.The article concludes that in a device with isolated inner AC system,MMC operating at higher frequency will be more competitive than typical 50Hz/60Hz MMC with moderate increase of operating power loss and significant reduction of the size of the AC components.
