直流侧电压平衡是级联型动态电压恢复器的关键问题。
DC voltage balance is the key issues of cascaded dynamic voltage restorer.
本文建立了变压器功率负载突然降低时电压平衡方程序。
In this paper, the mathematical models of transformer for suddenly lower load are investigated.
也发现即使三相输入电压平衡，输入电流也存在失真现象。
It is found that the input current produces distortion even if the three-phase input voltages are balanced.
主要讨论了单位功率因数实现和电容电压平衡问题及其关系。
The relationship between the unity power factor and the voltage balance of the capacitor was discussed.
根据质量平衡和槽电压平衡原理，提出了析气电极电流分布的数学模型。
A mathematical model of secondary current distribution for the gas-evolving electrode is presented on the basis of mass balance and voltage balance.
通过针对输出电容的电压差值的直流分量进行补偿，解决了电压平衡问题。
The problem of voltage balance was solved by a compensation for the difference of the output voltage of capacitor.
本发明还利用直流电源对并联电池进行充电，进一步提高了电压平衡的效率。
Further, direct current power supply is utilized to recharge the batteries in parallel connection, thereby increasing the efficiency of balancing voltage.
本文主要研究三电平逆变器在电压空间矢量控制过程中中性点电压平衡的控制方法。
This paper proposes a new strategy for balancing the neutral point voltage in the process of the three-level inverter vector controlling.
另一类为新型组合策略的飞跨电容型拓扑，它折衷考虑了开关状态的利用和飞跨电容的电压平衡。
Another is a new capacitor voltage combination scheme for flying capacitor multilevel inverters, which considers a tradeoff between the switching states and capacitor voltage balancing.
直流侧电容电压平衡问题是三电平逆变器的研究重点之一，本文对其提出了一种改进的控制方法。
One of the research emphases of three-level inverter is the DC capacitor voltage balancing problem. In this paper this problem is studied thoroughly and a new method to solve it is proposed.
该方法通过实时检测三相交流输出电流方向得到方向函数，利用该函数选择一个PWM周期内不同电压矢量作用时间来控制中点电流的方向，实现电压平衡。
By getting the direction function from the output AC current, the applied time of voltage vectors in one PWM period was chosen, the direction of central current was controlled for DC voltage balance.
该方法通过实时检测三相交流输出电流方向得到方向函数，利用该函数选择一个PWM周期内不同电压矢量作用时间来控制中点电流的方向，实现电压平衡。
By getting the direction function from the output AC current, the applied time of voltage vectors in one PWM period was chosen, the direction of central current was controlled for DC voltage balance.
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