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交流传动电力机车在运行过程中会出现车网电压不稳定现象。为了分析和解决问题,首先通过解析分析和线性化处理,推导出直流电压环节控制系统闭环传递函数,然后根据小增益原理推导出直流电压环节闭环系统鲁棒稳定的充分条件,并利用Matlab软件仿真验证理论分析的可靠性,最后提出当系统固有参数不能同时满足赫尔维茨稳定判据和小增益原理时,不能靠调节参数K解决问题,需要进一步研究解决方法。
AC drive electric locomotive in the course of the car network voltage instability occurs. In order to analyze and solve the problem, firstly, the closed-loop transfer function of DC link voltage control system is derived through analytic analysis and linearization process. Then the sufficient conditions for the robust stability of the closed-loop system with DC voltage link are deduced according to the small gain principle. The reliability of the theoretical analysis is validated. Finally, when the intrinsic parameters of the system can not satisfy both the Helvets’ stability criterion and the small gain principle, the problem can not be solved by adjusting the parameter K, and further research is needed.