针对多端低频交流输电(Low Frequency AC Transmission,LFAC)系统的功率控制问题,提出了一种新的基于循环换流器的控制方案。该控制方案包括调速器控制、虚拟同步发电机(Virtual Synchronous Generator,VSG)控制、滑动平均控制、自动电...针对多端低频交流输电(Low Frequency AC Transmission,LFAC)系统的功率控制问题,提出了一种新的基于循环换流器的控制方案。该控制方案包括调速器控制、虚拟同步发电机(Virtual Synchronous Generator,VSG)控制、滑动平均控制、自动电压调节控制、电压控制和电流限制器,其中VSG控制负责在各端间进行功率控制。多端系统采用带12脉冲晶闸管变换器的两相LFAC,能够在电源频率侧保持恒定功率。文中给出了详细的电路结构和应用参数,仿真结果验证了所提多端LFAC功率控制方法的有效性。展开更多
A new hybrid model rotor flux observer, based on a new voltage model, is presented. In the first place, the voltage model of an induction machine was constructed by using the modeling method discussed in this paper an...A new hybrid model rotor flux observer, based on a new voltage model, is presented. In the first place, the voltage model of an induction machine was constructed by using the modeling method discussed in this paper and then the current model using a flux feedback was adopted in this flux observer. Secondly, the two models were com- bined via a filter and then the rotor flux observer was established. In the M-T synchronous coordinate, the observer was analyzed theoretically and several important functions were derived. A comparison between the observer and the traditional models was made using Matlab software. The simulation results show that the observer model had a better performance than the traditional model.展开更多
文摘针对多端低频交流输电(Low Frequency AC Transmission,LFAC)系统的功率控制问题,提出了一种新的基于循环换流器的控制方案。该控制方案包括调速器控制、虚拟同步发电机(Virtual Synchronous Generator,VSG)控制、滑动平均控制、自动电压调节控制、电压控制和电流限制器,其中VSG控制负责在各端间进行功率控制。多端系统采用带12脉冲晶闸管变换器的两相LFAC,能够在电源频率侧保持恒定功率。文中给出了详细的电路结构和应用参数,仿真结果验证了所提多端LFAC功率控制方法的有效性。
基金Projects (00KJD470002, 03KJD470036) supported by the Natural Science Foundation of the Bureau of Education Jiangsu Province
文摘A new hybrid model rotor flux observer, based on a new voltage model, is presented. In the first place, the voltage model of an induction machine was constructed by using the modeling method discussed in this paper and then the current model using a flux feedback was adopted in this flux observer. Secondly, the two models were com- bined via a filter and then the rotor flux observer was established. In the M-T synchronous coordinate, the observer was analyzed theoretically and several important functions were derived. A comparison between the observer and the traditional models was made using Matlab software. The simulation results show that the observer model had a better performance than the traditional model.
