Analytical calculation of the RMS current stress on the DC link capacitor of voltage DC link PWM converter systems
Analytical calculation of the RMS current stress on the DC link capacitor of voltage DC link PWM converter systems
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DOI：
10.1049/cp:19990995
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
J. Kolar;T. Wolbank;M. Schrodl
中科院分区：
文献类型：
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作者：
J. Kolar;T. Wolbank;M. Schrodl
本文推导了负载侧逆变器对电压型直流环节换流系统直流环节电容电流应力的简单解析表达式。其中，假设逆变器输出电流为正弦曲线，直流环节电压为恒定值。直流链路电容器电流RMS值由调制深度以及逆变器输出电流的幅度和相位角确定。尽管忽略了输出电流涟漪，但分析计算的结果与数字仿真非常匹配，即使输出电流涟漪如给定的那样相对较高，例如，用于低频IGBT逆变器系统。因此，该近似可以有利地用于设计PWM转换器系统的DC链路电容器。
In this paper a simple analytical expression for the current stress on the DC link capacitor of a voltage DC link converter system, as caused by the load-side inverter is derived. There, a sinusoidal inverter output current and a constant value of the DC link voltage are assumed. The DC link capacitor current RMS value is determined by the modulation depth and by the amplitude and the phase angle of the inverter output current. Despite the neglection of the output current ripple the results of the analytical calculation match very well with a digital simulation even if the output current ripple is relatively high as given, e.g., for low-frequency IGBT inverter systems. Thus, the approximation can advantageously be used for designing the DC link capacitor of PWM converter systems.