电源快速切换下电动机群启动的安全稳定分析方法OA

The fast bus transfer can cause busbar voltage sags when the motor group starts,which poses a threat to power supply security and production stability.Aiming at the problem that it is difficult to accurately quantify the bus voltages at all levels in the motor group start-up under complex power supply networks during this process,the theoretical calculation process of the start-up of a single motor was discussed,and the calcula-tion method of the motor group start-up under the complex power supply network was derived.A quantitative calculation and safety stability analysis method for bus voltages at all levels during the start-up of a motor group under fast bus transfer was proposed.Taking a 110 kV industrial substation as a case study,calculations were performed to determine the busbar voltages(at medium-voltage and low-voltage sides)and the terminal voltages of the motors during group starting triggered by FBT operation on the high-voltage side of a three-winding trans-former.The impact on supply security was analyzed,and corresponding countermeasures were proposed.The feasibility of using per-unit values for conducting quantification calculations and safety stability analysis of bus voltages at all levels in complex network while motor group started was verified.This method provides a techni-cal reference for industrial enterprises to implement security and stability analysis of motor group start-up within complex power supply networks.