基于Middlebrook的舰船电力电子化推进系统的稳定性分析和控制器参数优化方法

Stability analysis and controller parameter optimization method for ship power electronic propulsion system based on Middlebrook criterion

  • 摘要:
    目的 针对电力电子化装置占比严重的舰船直流推进系统的稳定性问题,提出基于Middlebrook的稳定性分析和控制器参数优化方法。
    方法 首先,基于Middlebrook阻抗比稳定性判据,通过系统模型简化、非线性系统的线性化处理以及三相交流系统dq变换等,推演建立直流母线小信号输出阻抗、逆变器与电机的小信号输入阻抗模型;然后,通过粒子群算法优化控制器参数,在确保系统稳定的条件下最大限度地降低支撑电容取值;最后,搭建舰船直流推进系统仿真模型,开展支撑电容与直流母线的等效电阻和等效电感对系统稳定性影响的仿真分析。
    结果 仿真结果表明:通过粒子群算法优化控制器参数之后,明显提高了系统稳定裕度,进而降低了支撑电容取值,这将有利于缩减舰船直流推进系统变流器整体尺寸。
    结论 研究成果可为电力电子化占比严重的综合电力系统电压振荡及其抑制研究提供参考。

     

    Abstract:
    Objectives  Aiming at the stability problem of naval DC propulsion systems with a significant proportion of power electronic devices, a stability analysis and controller parameter optimization method based on the Middlebrook impedance ratio stability criterion is proposed.
    Methods First, the small-signal output impedance of the DC bus and small-signal input impedance of the inverter and motor are deduced and established through the simplification of the system model, linearization of the nonlinear system, dq transformation of the three-phase AC system, etc. The controller parameters are then optimized using a particle swarm algorithm to minimize the value of support capacitance on the condition of ensuring system stability. Finally, a simulation model of the DC propulsion system is constructed to simulate and analyze the influence of the support capacitance and equivalent resistance and inductance of the DC bus on the stability of the system.
    Results The simulation results show that the system's stability margin is obviously improved after the controller parameters are optimized by the particle swarm algorithm, which in turn lowers the value of support capacitance and reduces the overall size of the DC propulsion system's converter.
    Conclusions The findings of this study can provide useful references for research on voltage oscillations and their suppression in integr-ated power systems with a significant proportion of power electronic devices.

     

/

返回文章
返回