一种抑制系统漏电流非隔离型三电平逆变器中点平衡载波调制算法

发布时间：2018-10-31 12:38

【摘要】：为了同时解决漏电流和中点平衡这两个问题,首先分析系统漏电流产生的机理以及传统调制策略对漏电流的影响,并且在大中零矢量调制(LMZVM)算法的基础上提出一种基于零序电压注入的大中正负小矢量调制(LMP/NSVM)算法。在非单位功率因数的情况下,根据直流侧中点总电荷量最小而选择LMP/NSVM或LMZVM策略,与大中小矢量调制(LMSVM)策略相比,本文提出的LMP/NSVM算法中点电位调节速度更快、稳态波动更小。系统漏电流与LMZVM基本相同并且优于传统的SVPWM,而且是基于载波思想实现的,算法简单、易于实现,因而该调制策略具有一定的工程应用价值。最后,与传统的三种调制策略实验结果对比,验证了理论分析的正确性与有效性。
[Abstract]:In order to solve the two problems of leakage current and midpoint balance simultaneously, the mechanism of leakage current generation and the influence of traditional modulation strategy on leakage current are analyzed. Based on the (LMZVM) algorithm of large and medium zero vector modulation, a large, medium and negative vector modulation (LMP/NSVM) algorithm based on zero-sequence voltage injection is proposed. In the case of non-unit power factor, according to the minimum total charge at the midpoint of the DC side, the LMP/NSVM or LMZVM strategy is chosen. Compared with the large, medium and small vector modulation (LMSVM) strategy, the proposed LMP/NSVM algorithm adjusts the midpoint potential more quickly. The steady state fluctuation is smaller. The leakage current of the system is basically the same as that of LMZVM and is superior to the traditional SVPWM, which is based on the carrier idea, and the algorithm is simple and easy to implement, so the modulation strategy has certain engineering application value. Finally, compared with the experimental results of three traditional modulation strategies, the correctness and validity of the theoretical analysis are verified.
【作者单位】：合肥工业大学电气与自动化工程学院;
【基金】：国家高技术研究发展计划(863计划)资助项目(2015AA050607)
【分类号】：TM464

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