直交型电力机车直流侧电压稳定控制及改善方法

Stability control and improvement strategy for DC side voltage of DC-AC electric locomotives

针对直交型电力机车在恒功率工况下的直流侧电压不稳定问题,提出一种网侧电路与牵引传动系统动态解耦的有源阻抗稳定控制方法,并提出一种回馈系数改善策略,以降低网侧电压纹波对牵引传动系统的影响。建立了系统等效数学模型,依据系统稳定判据提出一种有源阻抗稳定控制方法,然后分析了在网侧电压含有纹波时稳定控制对牵引传动系统的影响,通过引入合适的控制回馈系数对控制效果进行改善,通过仿真与实验证明了所提控制方法与改善策略的可行性和正确性。

Aiming at the problem of DC side voltage in stability of DC-AC electric locomotives under constant power condition, a kind of active impedance stability control based on dynamic decoupling of grid-side circuit and traction drive system is proposed , and the improvement strategy of feedback factor is put forward to reduce the influence of the grid-side voltage ripple on traction drive system. The equivalent mathematical model is established, and the active impedance stability control method is proposed according to the system stability criterion. Then the effect of stability control on the traction drive system is analyzed when voltage ripple exists on the grid side, and the proper feedback factor is introduced to improve the control effect. The simulation and experiment prove the feasibility and correctness of the proposed control method and improvement strategy.