Design of a Cascaded H-Bridge Multilevel Inverter Based on Power Electronics Building Blocks and Control for High Performance
Design of a Cascaded H-Bridge Multilevel Inverter Based on Power Electronics Building Blocks and Control for High Performance
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DOI：
10.6113/jpe.2010.10.3.262
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发表时间：
2010-05
影响因子：
1.4
通讯作者：
Young Min Park;Han-Seong Ryu;Hyun-Won Lee;Myung-Gil Jung;Se-Hyun Lee
中科院分区：
文献类型：
--
作者：
Young Min Park;Han-Seong Ryu;Hyun-Won Lee;Myung-Gil Jung;Se-Hyun Lee
本文提出了一种单相AC/DC PWM变换器直流侧电容的估算方法。在无负载条件下，受控AC电流（30[Ω]）被注入到输入侧，其然后在DC输出侧引起AC电压纹波。或者，受控的AC电压可以直接注入到DC输出侧。通过使用数字滤波器提取直流输出侧的交流电压/电流和功率分量，可以计算电容值，其中使用递归最小二乘（RLS）算法。所提出的方法可以简单地仅用软件实现，并且不需要额外的硬件。从实验结果来看，电容的高精度估计小于0.85%。
In this paper, a capacitance estimation scheme for DC-link capacitors for single-phase AC/DC PWM converters is proposed. Under the no-load condition, a controlled AC current (30[㎐]) is injected into the input side, which then causes AC voltage ripples at the DC output side. Or, a controlled AC voltage can be directly injected into the DC output side. By extracting the AC voltage/current and power components on the DC output side using digital filters, the capacitance value can be calculated, where the recursive least squares (RLS) algorithm is used. The proposed methods can be simply implemented with software only and additional hardware is not required. From the experiment results, a high accuracy estimation of capacitances less than 0.85% has been obtained.