AI 中文总结
针对耦合八开关三相三电平逆变器现有调制策略功率因数范围受限的问题，提出混合虚拟空间矢量调制，扩展功率因数范围至[-90°,90°]，并结合有源中性点电压控制，经3kVA样机实验验证可行。
AI 中文摘要
随着光伏（PV）和电机驱动技术的发展，耦合八开关三相三电平逆变器（TP-TLI）受到越来越多的关注。然而，以往针对耦合八开关TP-TLI的调制策略仅适用于高功率因数（PF）场景，无法满足光伏和电机驱动的需求。针对这一问题，本文提出一种用于耦合八开关TP-TLI的混合虚拟空间矢量调制（HVSVM），以扩展其PF范围。深入分析了PF受限的机理，在每个扇区构建两个虚拟矢量，并根据所用虚拟小矢量的数量提出三种具有不同PF范围的基本VSVM。结合三种VSVM，通过检测三相电流极性提出HVSVM，其PF角范围从约[-30°, 30°]扩展至[-90°, 90°]。此外，还提出一种有源中性点电压控制（NPVC），通过两个系数调节两对冗余小矢量的作用时间，该方法考虑了中性点电流和中性点电压（NPV）的推导，因此能精确控制NPV。通过3 kVA样机的实验验证了所提HVSVM和有源NPVC的正确性与可行性。
英文摘要
With the development of photovoltaic (PV) and motor drive, the coupled eight-switch three-phase three-level inverter (TP-TLI) is receiving more attentions. However, the previous modulation strategies for coupled eight-switch TP-TLI are suitable for high power factor (PF), which cannot satisfy the requirement for PV and motor drive. Aiming at this, this paper proposes a hybrid virtual space vector modulation (HVSVM) for the coupled eight switch TP-TLI with extended PF range. The mechanism of PF limitation is analyzed in deep. Two virtual vectors are constructed in each sector, and three basic VSVMs with different PF range are proposed according to the number of virtual small vectors used. Combined with three VSVMs, the HVSVM is proposed by detecting the three-phase current polarities. The PF angle range of the HVSVM is extended from about [-30°, 30°] to [-90°, 90°]. Besides, an active neutral-point voltage control (NPVC) is also presented by using two coefficients to adjust the dwell times of the two pairs of redundant small vectors. This approach considers the NP current and the derivation of NPV, and thereby it is accurate to control the NPV. The correctness and feasibility of the proposed HVSVM and active NPVC are verified by experiments through a 3 kVA prototype.
Comments5 pages, 13 figures, conference
