A technique of parallel connections of pulsewidth-modulated NPC inverters by using current-sharing reactors
A technique of parallel connections of pulsewidth-modulated NPC inverters by using current-sharing reactors
复制标题
均流电抗器脉宽调制NPC逆变器并联技术
DOI：
10.1002/eej.4391170506
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
Makoto Watanabe
中科院分区：
文献类型：
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作者：
F. Ueda;K. Matsui;K. Tsuboi;M. Asao;Tadashi Kobayashi;Makoto Watanabe
中性点箝位（NPC） PWM逆变器具有许多优点，例如能够以接近正弦的电流波形运行电机。因此，在更大容量的逆变系统中，采用gto等的NPC PWM逆变器也得到了实际应用，因为它相对于大容量交流电机驱动具有纹波电流更小、输出电压更高的优点。随着应用的普及，更大容量的逆变器也有望出现。但是，由于这种开关设备的容量不足，针对NPC逆变器并联的问题，提出了一定的技术和控制方法。该逆变器的输出电压波形具有一定的电压电平，因此可以预见输出谐波分析将会很困难。针对输出电压、共流电抗器的这类波形，提出了一种频率分析方法，并通过实验对分析结果进行了验证。
The neutral-point-clamped (NPC) PWM inverters have many advantages such as the ability to operate the motor with nearly sinusoidal current waveforms. For this reason, in larger-capacity inverter systems, NPC PWM inverters using the GTOs, etc., have also been put into practical use because of great advantages to large-capacity ac motor drives such as lower ripple currents and higher output voltages. With the spread of applications, still larger-capacity inverters also are expected. However, since the capacities of such switching devices are insufficient, a certain technique and controlling method are proposed for the parallel connections of NPC inverters. The output voltage waveforms of the proposed inverter have certain voltage levels, and thus it is anticipated that it will be difficult to analyze the output harmonics. For such waveforms of output voltage and current-sharing reactor, a frequency analysis approach is described whose results are verified by experiments.