In order to address the issues of power quality, more CPD (custom power device) have been developed.

针对各种电能质量问题，人们研制了各种设备。

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Dynamic voltage restorer (DVR) has been considered to be a cost effective custom power device and has attracted much research attention recently.

动态电压恢复器(DVR)作为一种重要的用户电力装置，受到国内外研究者的广泛关注。

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Unified power quality controller (UPQC) is a new device for custom power. It can provide multiple power quality regulation functions.

统一电能质量控制器(UPQC)是用户电力技术中的新兴装置，它能统一实现多重电能质量调节功能。

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