A Proposal of a 3.3-kV/6.6-kV Transformerless Hybrid Filter, and Experimental Verification Based on a 200-V Laboratory System
A Proposal of a 3.3-kV/6.6-kV Transformerless Hybrid Filter, and Experimental Verification Based on a 200-V Laboratory System
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3.3kV/6.6kV无变压器混合滤波器的提案以及基于200V实验室系统的实验验证
DOI：
10.1541/ieejias.122.989
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发表时间：
2002
影响因子：
--
通讯作者：
H. Akagi
中科院分区：
文献类型：
--
作者：
S. Srianthumrong;Y. Tamai;H. Akagi
本文提出了一种无变压器并联混合滤波器，用于交流电压为3.3kV或6.6kV的三相六脉波二极管整流器的谐波补偿。该混合滤波器由一个单调谐LC滤波器每相和一个有源滤波器与直流电容电压低至300 V或600 V。这两个滤波器直接相互串联，不需要任何Transformer。无源滤波器吸收整流器产生的谐波电流，而有源滤波器改善无源滤波器的滤波特性。有源滤波器所需的额定值比单独使用的传统并联有源滤波器小得多。此外，有源滤波器不需要额外的开关纹波滤波器，因为LC滤波器不仅用作7次谐波频率附近的调谐LC滤波器，而且还用作10kHz附近的开关纹波滤波器。提出了一种前馈控制方案，以提高有源滤波器的性能。通过对200 V、5 kW实验室系统的实验结果和3.3 kV、300 kW系统的仿真结果验证了该系统的有效性。该混合滤波器具有良好的补偿性能，使其具有实用价值。
This paper proposes a transformerless shunt hybrid filter for harmonic compensation of a three-phase six-pulse diode rectifier, where the ac line-to-line voltage is 3.3kV or 6.6kV. The hybrid filter consists of a single tuned LC filter per phase and an active filter with a dc capacitor voltage as low as 300V or 600V. The two filters are directly connected in series with each other without any transformer. The passive filter absorbs harmonic currents produced by the rectifier, whereas the active filter improves the filtering characteristics of the passive filter. The required rating of the active filter is much smaller than that of a conventional shunt active filter used alone. In addition, no additional switching-ripple filter is required for the active filter, because the LC filter acts not only as a tuned LC filter around the 7th-harmonic frequency but also as a switching-ripple filter around 10kHz. A feedforward control scheme is also proposed to improve the active filter performance. Experimental results obtained from a 200-V, 5-kW laboratory system and simulation results of a 3.3-kV, 300-kW system confirm the validity and effectiveness of the system. The hybrid filter gives satisfactory compensation performance, thus allowing us to put it into practical use.