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基于移频理论的多模式VBR异步电机仿真建模

Multi-mode VBR Induction Machine Model Based on Frequency Shifting Theory

  • 摘要: 为满足对异步电机暂稳态过程准确、快速仿真的需要,提出了一种基于移频理论的多模式voltage-behind-reactance (VBR)异步电机仿真模型。首先,基于希尔伯特变换,将电气信号转换为相应的解析信号;其次,进一步引入移频变换技术,分别构建多尺度VBR与近似VBR异步电机移频仿真模型。最后,通过不同的移动频率和不同的VBR模型之间的切换,实现准确、高效的多时间尺度暂态和稳态过程仿真。当移动频率等于零时,该模型与传统电磁暂态近似VBR电机模型等价,可刻画高频暂态过程,且电机模型具有恒定阻抗矩阵,大幅度提升了仿真效率;当移动频率等于系统基波频率时,采用多尺度VBR移频暂态模型,模型可使用大步长仿真,获得低频暂态和稳态的包络曲线。仿真结果表明,所提出的模型可实现准确和高效的异步电机多时间尺度暂态与稳态仿真。

     

    Abstract: To achieve high efficiency and accuracy of simulation, a multi-mode voltage-behind-reactance(MVBR) induction machine model was proposed based on frequency shifting theory. At first, the analytic signals were constructed by using Hilbert transform. Frequency shifting was performed, and multi-scale VBR and approximate VBR(AVBR) models were developed. Meanwhile, shift frequency was introduced as a novel parameter in the proposed MVBR model. By appropriate selection of shift frequencies, accurate and efficient multi-scale transients simulation was supported. When the shift frequency was set to be zero, MVBR model performed in the same way as AVBR model. In this mode, high-frequency transients were simulated accurately with small time-step sizes. The conductance matrix of machine model remained constant, thereby contributing to improvement in simulation efficiency. When the shift frequency equaled the carrier frequency, multi-scale VBR model was selected. Large time-step sizes can be used in the simulation of low-frequency transients and steady-state. The test case demonstrated the effectiveness of the proposed machine model in terms of accuracy and efficiency.

     

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