In the Three phase and Four wire circuit system, the neutral wire is very important.
在三相四线制供电系统中，中性线是非常重要的。
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。
Moreover, three-phase four-wire active filters can suppress zero line current, and solve symmetric problem of system effectively.
另外，三相四线制有源电力滤波器能有效地抑制零线电流，并能有效地解决系统的不对称问题。
A new DSP based hybrid power filter designed under the condition of three-phase four-wire system is presented.
介绍了一种基于DSP的三相四线制系统混合型电力滤波装置。
The experimental results indicate that this method can be used to detect the reactive power and harmonic current exactly in three-phase four-wire system.
通过试验验证，该检测方法能够很好的实现对三相四线制系统中的无功和谐波电流的检测。
First of all, current detection method for three-phase four-wire system is researched.
首先，本文针对三相四线制的电流检测方法进行了研究。
First of all, current detection method for three-phase four-wire system is researched.
首先，本文针对三相四线制的电流检测方法进行了研究。
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