是头轻、头重、还是中点平衡？
通过两输出电容电压的偏差改变电流参考给定来实现整流器输出中点平衡。
The problem of neutral-point balance is resolved by changing the amplitude of current reference according to the voltage error of two capacitors.
WebSphereRealTime引入了两种解决方案在不同的折中点平衡这两种需求。
WebSphere Real Time introduces two solutions to balance these two requirements at different trade-off points.
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.
针对三电平逆变器固有的中点电位平衡问题，本文提出并分析了两种能控制中点电位平衡的控制策略。
Two methods to control the neutral point potential are proposed in this thesis which can solve the neutral point potential problem owned by three-level inverter.
没有这两个闸室，就不能为冲程中点起平衡作用。
Without this the two chambers would balance out in mid-stroke.
中点电位平衡问题是三电平npc逆变器的一个固有问题。
The neutral-point balancing is an inherent problem of the three-level NPC inverter.
经过带载实验运行，中点电位始终保持在允许范围内，实现了动态平衡。
After experiments with a load, neutral point potential is always maintained within the allowable range, to achieve a dynamic balance.
设计了动态电流滞环pwm控制算法对直流侧电压进行控制，有效地保证了直流侧中点电位的平衡。
A dynamic hysteresis-band current PWM control arithmetic is also designed to control the voltage of the DC bus, which keeps it steady effectively for the voltage of the neutral point of the DC bus.
同时，该拓扑具有电压自平衡能力，无需额外的中点电位平衡电路。
Meanwhile, the topology has voltage-self-balance ability, and therefore, no additional neutral-point-potential balancing circuit is needed.
同时，该拓扑具有电压自平衡能力，无需额外的中点电位平衡电路。
Meanwhile, the topology has voltage-self-balance ability, and therefore, no additional neutral-point-potential balancing circuit is needed.
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