Design and Comparison of High-Order Output Filters for Grid-Connected Converters with Low Switching Frequency

Hao Qian, Jinming Xu, Yuan Hu, Shaojun Xie
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引用次数: 1

Abstract

For a grid-connected converter, the output filter is probably one of the heaviest and bulkiest components. As the power rating continues to rise, the switching frequency is quite limited and the size of the output $L$ filter can increases a lot. It is challenging to design the output filter with small size. It has been a consensus for researchers and engineers that high-order filters are more suitable than the conventional L-type filter because they exhibit higher attenuations of switching harmonics even at low switching frequencies. However, among so many kinds of high-order filters, it can still be unclear which one is more suitable for high-power converters with low switching frequencies. Hence, in this paper, three high-order output filters (i.e., LCL, LLCL, LCL-LC) are selected and designed for 4 MW grid-connected inverter, by considering the variations of filter parameters. Especially, in the view of minimizing the total stored energy, the comparisons of different high-order filters are emphasized. It is shown that a higherorder filter may not always have a lower value of stored energy and the LLCL filter can realize the lowest stored energy among the discussed high-order filters.
低开关频率并网变流器高阶输出滤波器的设计与比较
对于并网转换器,输出滤波器可能是最重和最笨重的部件之一。随着额定功率的不断提高,开关频率相当有限,输出$L$滤波器的尺寸可以增加很多。设计小尺寸的输出滤波器是一个挑战。研究人员和工程师一致认为,高阶滤波器比传统的l型滤波器更合适,因为它们即使在低开关频率下也表现出更高的开关谐波衰减。然而,在众多的高阶滤波器中,究竟哪一种更适合低开关频率的大功率变换器,仍然是一个未知数。因此,本文针对4mw并网逆变器,考虑滤波器参数的变化,选择并设计了LCL、LLCL、LCL- lc三种高阶输出滤波器。特别从最小化总存储能量的角度出发,着重对不同高阶滤波器进行了比较。结果表明,高阶滤波器并不总是具有较低的储能值,LLCL滤波器可以实现所讨论的高阶滤波器中最低的储能值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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