126 kV真空断路器电机驱动负载需求分析与优化

Analysis and Optimization of Load Torque Demand of 126 kV Vacuum Circuit Breaker Based on Motor Driving

文中针对电机驱动机构在126 kV真空断路器的应用,首先进行理论建模,分别构建了旋转电机驱动机构传动链的运动学和动力学约束方程。基于MATLAB求解约束方程,并对伺服电机负载扭矩的组成进行了分解和分析。然后为减小伺服电机负载扭矩,从拐臂起始角度、灭弧室自闭力和触头动端质量三方面进行了优化。最后利用刚体动力学分析软件Adams对不同伺服控制策略下的负载扭矩进行了仿真计算。位置伺服控制模式下,伺服电机负载扭矩波动范围大,分闸过程中转矩利用率低。为提高电机转矩利用率,文中提出基于提高转矩利用率的闭环转角控制,通过仿真计算与试验测试对比,在超程段和加速段,电机电流都处于400 A较高幅值区间,在减速段电流迅速下降,转矩整体利用率达到49.4%,间接反映出伺服电机输出扭矩与仿真结果的趋势比较吻合。

For the application of the motor driving mechanism in the 126 kV vacuum circuit breaker,theoretical modeling is carried out,and kinematic and dynamic constraint equations of the transmission chain of the rotary motor driving mechanism are constructed.MATLAB is employed to solve the constraint equations,and the load torque of the servo motor is decomposed and analyzed.In order to reduce the load torque of the servo motor,optimization is performed on the starting angle of the crank,the self⁃closing force of the arc extinguishing chamber,and the mass of the contact moving end.The rigid body dynamics analysis software Adams is used to simulate the load torque under different servo control strategies.In the position servo control mode,the fluctuation range of servo motor load torque is large,and the torque utilization rate during switching⁃off process is low.To improve the motor torque utilization rate,a closed⁃loop rotation angle control method is proposed.Comparison of the results between simulation calcula⁃tion and test show that the motor current is in the higher amplitude range of 400 A in the over⁃travel section and the acceleration section,and descends rapidly during the deceleration phase.The torque utilization rate reaches 49.4%,which indirectly reflects that the output torque of the servo motor is in good agreement with the trend of the simulation results.