In this paper, two types of main power circuits and their control methods are introduced when constructing active power filter in three phase four wire system.
本文介绍了在实现三相四线制有源电力滤波器时所采用的两种不同的主电路结构及其控制方法。
Phase III: it is to continue constructing the items built in the preceding two phases, and construct Natural Ecological Experience Area and Jade Beauty Alpine Valley Exploration Area.
三期建设：继续建设完善前两期所建的项目，并建设自然生态体验区、玉美人高山峡谷探险游览区。
Phase III: it is to continue constructing the items built in the preceding two phases, and construct Natural Ecological Experience Area and Jade Beauty Alpine Valley Exploration Area.
三期建设：继续建设完善前两期所建的项目，并建设自然生态体验区、玉美人高山峡谷探险游览区。
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