Minimization of Filter Capacitor for Medium-Voltage Current-Source Converters Based on Natural Sampling SVM
Minimization of Filter Capacitor for Medium-Voltage Current-Source Converters Based on Natural Sampling SVM
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DOI：
10.1109/tpel.2017.2663779
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发表时间：
2018
影响因子：
6.7
通讯作者：
Q. Wei;Bin Wu;D. Xu;N. Zargari
中科院分区：
文献类型：
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作者：
Q. Wei;Bin Wu;D. Xu;N. Zargari
用于大功率（兆瓦级）中压（MV） （2.3-6.6 kV）驱动器的电流源转换器（CSCs）需要三相电容器来辅助开关器件的换相，并过滤掉转换器输出PWM电流的谐波。不同类型的调制方案具有不同的谐波性能，导致不同的电容选择。传统的空间矢量调制（SVM）具有高动态性能，即使有主动阻尼的帮助也无法在实际中使用，而主动阻尼可以有效地抑制传统支持向量机可能引入的LC共振。近年来，提出了一种自然采样支持向量机（NS-SVM）用于中压CSC驱动器。它具有优良的低次谐波特性，在实践中得到了广泛的应用。因此，本研究主要关注两个问题。一个是为什么传统的支持向量机即使在主动阻尼的帮助下也不能在实践中使用。在此基础上，二是基于NS-SVM的电容最小化。最后进行了实验验证。
Current-source converters (CSCs) used in high-power (megawatt level) medium-voltage (MV) (2.3–6.6 kV) drives require three-phase capacitors to assist the commutation of switching devices and to filter out harmonics of the converter output PWM current. Different types of modulation schemes with different harmonic performance lead to different capacitor selections. Conventional space vector modulation (SVM) featuring high dynamic performance cannot be used in practice even with the help of active damping, which can effectively damp the possible LC resonance introduced by conventional SVM. Recently, a natural-sampling SVM (NS-SVM) is proposed for MV CSC drives. It features superior low-order harmonics and has been highly considered for MV CSCs in practice. This study, therefore, focuses on two issues. One is why conventional SVM cannot be used in practice even with the help of active damping. On this basis, the second is capacitor minimization based on NS-SVM. Finally, experimental verification is provided.