A new conception of power per unit impedance is defined and the basic equation to express the variation of load voltage magnitude with the variation of its dynamic equivalent impedance a. 定义了单位阻抗功率的新概念,推导了电压幅值随其等值阻抗和单位阻抗功率变化而变化的基本方程式。
Voltage sag not only causes drop of voltage magnitude, but also results in sudden changes of the phase angle, hence the difficulty of compensation is further increased. 电压暂降除了幅值减小外,还往往伴随着相角跳变,这样更增加了补偿难度。
In static load modeling, the nonlinear mapping between active power or reactive power and voltage magnitude, frequency and load parameters is established by SVM. SVM静态负荷模型建模的基本思想是用两个SVM分别表示有功功率、无功功率和电压幅值、频率值以及其他表征负荷特性的参数之间的非线性映射关系。
Aiming at transient variations of voltage magnitude, which is one of the power quality issues, the background and actuality in the area are introduced. Then in this paper, a transformer-less series voltage transient variation compensator topology without energy storage capacitors is analyzed. 针对电能质量中电压暂变问题,本文在介绍了其控制技术的发展现状的基础上,研究了一种无变压器无储能电容的串联型电压暂变补偿电路新拓扑。
The negative effects of load caused by the negative sequence component of the supply voltage can be eliminated and the load voltage magnitude can be restored to referenced value by using the three phase voltage source inverter. 该动态电压恢复器由一传统的三相电压型逆变器和一射极跟随器组成,其中,三相电压型逆变器用于消除供电电压中负序分量对负荷的影响,并将负荷电压恢复到给定的水平;