大容量电力电子装置中母排杂散电感提取方法的优化研究

在大容量电力电子装置中,母排的杂散电感在开关器件换流过程中会引入非理想的电压尖峰,并使得系统的电磁干扰进一步恶化。为分析与优化系统性能,需要对母排的杂散电感进行准确提取。相比于传统微分法,应用积分法提取母排杂散电感具有抗噪声能力强、计算结果对波形形状不敏感等优点,然而在简单的积分运算中积分时限的选取对计算结果有较大的影响。提出一种优化的积分形式的母排杂散电感的提取方法,在传统积分法的基础上考虑杂散电阻和测量偏置两个影响因素,提高了计算的准确度。最后,基于1 200V/3 600A的IGBT双脉冲测试平台,对母排进行有限元仿真,通过仿真结果与几种不同方法计算得到的结果进行对比,验证了所提方法的有效性与准确性。

Optimized Stray Inductance Extraction Method of Bus Bar in Large-Capacity Power Electronic Equipment

In large-capacity power electronic equipment, the stray inductance of the bus bar will not only cause higher voltage peak but also bring serious EMI issues during the commutation process. Thus, the stray inductance needs to be calculated accurately to analyze and optimize the system performance. Compared with the conventional differential method, the integral form is insensitive to the shape of the current waveform and has anti-noise ability. However, the results are greatly influenced by the boundary of integral. In this paper, an improved integral form of inductance extraction method for the bus bar is proposed. Herein, both the stray resistance and the measuring bias are considered to improve the calculation accuracy. Moreover, a double-pulse testing platform for the 1200V/3600A IGBT is built. The stray inductance is extracted through different methods to verify the effectiveness and the accuracy of the proposed method.