基于Super-Twisting算法的内燃机车永磁同步发电系统策略研究

为了使内燃机车永磁同步发电系统在内燃机全速范围内和突变性负载条件下均能稳定控制中间直流环节电压且减小电压的脉振,采用Super-Twisting高阶滑模算法对电压外环进行控制得到给定转矩,与传统PI外环控制相比,中间直流环节电压开始的超调减小,且电压跟随性、稳定性得到提升。同时,为了提高发电系统变流器容量利用率,在矢量控制的基础上,提出改进的功率因数控制策略对电机进行控制。仿真试验表明,所提发电系统在内燃机宽转速范围、突变性负载条件下,可以得到平稳且能够快速恢复的中间直流电压。同时,发电系统在切换转矩内无功功率基本能稳定在零附近,超过切换转矩后无功功率依旧保持较低水平,提高了变流器容量利用率。

Strategy of Permanent Magnet Synchronous Power Generation System for Diesel Locomotive Based on Super-Twisting Algorithm

The permanent magnet synchronous power generation system of diesel locomotive needs to stably control the intermediate DC link voltage, as well as reduce the voltage pulsation within the full speed range of the internal combustion engine and under sudden load conditions. To meet these requirements, the super-twisting high-order sliding mode algorithm is used to control the voltage of the outer loop to obtain a given torque. Compared with the traditional PI outer loop control, the overshoot of the intermediate DC link voltage is reduced, and the voltage following ability and stability are improved. At the same time, in order to improve the utilization rate of the converter capacity of the power generation system, an improved power factor control strategy is adopted to control the motor based on vector control. Simulation experiments show that the proposed power generation system can obtain a stable and fast-recoverable intermediate DC voltage under the conditions of a wide range of internal combustion engine speed and sudden load. At the same time, the reactive power of the power generation system below the switching torque can basically stabilize near zero. After the switching torque is exceeded, the reactive power remains at a low level, which improves the utilization rate of the converter capacity.