摘要
针对当前三相电压不平衡度计算方法存在的问题,提出新的计算方法—向量等效法,即把三相电压向量分解成水平、垂直分量,并计算出水平、垂直分量与相电压的关系式,通过相关计算推导,得出相位正、负序分量以及三相不平衡度与三相电压幅值大小的关系,从而计算正、负序分量以及三相不平衡度。向量等效法只需电压幅值大小就能算出结果,而根据国标定义则需要电压幅值与相位才能计算,但最终结果两者一致,说明该方法计算简单且有效。
In allusion to existing problems in present calculation method for degree of three-phase voltage unbalance,a new kind of calculation method called vector equivalence is proposed,which decomposes three-phase voltage vector into level and vertical components and works out relational expressions respectively between level component and the phase voltage as well as vertical component and the phase voltage. By means of related calculating and deducing,it is able to get relationships between positive sequence and negative sequence components of the phase and three-phase voltage amplitude,as well as that between degree of three-phase voltage unbalance and three-phase voltage amplitude. Thereby,it is able to work out positive sequence component,negative sequence component and degree of three-phase unbalance. It is only need voltage amplitude for vector equivalence method to work out the result while both voltage amplitude and phase are needed for calculating based on national standard. Final consistent results of the two methods indicate that the method of vector equivalence is more simple and effective.
出处
《广东电力》
2016年第4期89-93,共5页
Guangdong Electric Power
关键词
正序分量
三相电压不平衡
准确性
负序分量
不平衡度
positive sequence component
three-phase voltage unbalance
veracity
negative sequence component
degree of unbalance
