二极管钳位型五电平逆变器高调制比高功率因数改进的均压方法

发布时间：2018-06-23 12:51

本文选题：二极管钳位型五电平 + 电容均压　；参考：《中国电机工程学报》2014年24期

【摘要】：多电平变换器以其优良的性能而被广泛研究,其中二极管钳位型多电平存在直流侧电容电压不均衡的问题。二极管钳位型五电平(five-level diode-clamped converter,5L-DCC)基于目标函数优化最近三矢量空间矢量调制(space vector modulation,SVM)均压算法受调制比和功率因数影响,调制比小于0.5(简称低调制比)时可以实现全功率因数范围均压,而调制比大于0.5(简称高调制比)时,调制比越大,功率因数越低。提出一种5L-DCC高调制比高功率因数改进的矢量分解SVM调制均压方法,算法利用内六边形6个有效矢量4种冗余状态对电容电压的调节能力,解决了5L-DCC高调制比电压平衡受功率因数限制的问题。仿真与实验表明,改进的矢量分解SVM均压方法具有良好的均压能力。
[Abstract]:Multilevel converters have been widely studied for their excellent performance, among which the diode-clamped multilevel has the problem of unbalanced capacitance voltage on the DC side. Diode-clamped five-level (five-level diode-clamped convertor 5L-DCC) based on objective function optimizes the nearest three-vector space vector modulation (space vector) equalization algorithm, which is influenced by modulation ratio and power factor. When the modulation ratio is less than 0.5 (the low-key ratio), the full power factor range can be realized, while when the modulation ratio is greater than 0.5 (high modulation ratio), the higher the modulation ratio is, the lower the power factor is. An improved vector decomposition SVM voltage sharing method with high modulation ratio and high power factor for 5L-DCC is proposed. The algorithm makes use of the four redundant states of six effective vectors of the inner hexagonal to adjust the capacitance voltage. The problem that the voltage balance of high modulation ratio of 5L DCC is limited by power factor is solved. Simulation and experiments show that the improved vector decomposition SVM equalization method has a good voltage sharing ability.
【作者单位】：东南大学电气工程学院;深圳市英威腾电气股份有限公司;
【基金】：江苏省产学研前瞻性联合研究项目(BY2011156)~~
【分类号】：TM464

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