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现代军用多电飞机270 V直流供电系统中的功率电子负载和电动机负载不断增加,这种负载因内部闭环控制而呈现恒功率的特性,即呈现出负阻抗特性,该特性与滤波元件间的相互作用会严重危害系统的稳定性。研究具有双级LC滤波器的恒功率负载系统的稳定性,建立基于混合势函数理论的数学模型,推导得到系统在大扰动条件下的稳定性判据。该判据是在考虑恒功率负载负阻抗大小的基础上,给出了滤波器元件参数的约束条件。分析及实验结果表明,该判据能够保障系统在大扰动下的稳定性,且结构简单,便于应用。
The power electronic load and the motor load in the modern military multi-aircraft 270 V DC power supply system are constantly increasing. This load exhibits a constant power characteristic due to the internal closed-loop control, that is, exhibits a negative impedance characteristic. Role will seriously endanger the stability of the system. The stability of a constant power load system with a two-stage LC filter is studied. A mathematical model based on the mixed potential function theory is established, and the stability criterion of the system under large disturbances is deduced. The criterion is based on the constant impedance of negative power load size, given the constraints of the filter element parameters. The analysis and experimental results show that the criterion can guarantee the stability of the system under large disturbances, and the structure is simple and easy to apply.