CAJ | 학술논문

在电机调速控制问题的研究中，七相感应电机调速系统缺相运行具有代表性，近年受到关注。在七相电机正常情况下，根据空间解耦模型和SVPWM调制算法，在机电能量转换的基波子空间内作用电压矢量的同时，也会在3次、5次谐波子空间产生谐波电流。在缺相情况下，电压矢量分布变化，获取严格的空间解耦模型较为困难。为解决上述问题，采用缺相简化模型，将七相电机缺一相及多相的各种情况进行建模，给出电压矢量分布，并分别采用传统直接转矩( DTC )和矢量控制( VC)进行仿真。传统DTC需针对不同缺相情况选择不同矢量，算法不具备通用性，且定子电流谐波含量大，高速性能、带载能力下降明显；为此，提出改进型 UVM矢量控制，无需针对特定缺相情况，算法具有通用性，定子电流谐波含量小，带载能力也高于传统DTC。
재전궤조속공제문제적연구중，칠상감응전궤조속계통결상운행구유대표성，근년수도관주。재칠상전궤정상정황하，근거공간해우모형화SVPWM조제산법，재궤전능량전환적기파자공간내작용전압시량적동시，야회재3차、5차해파자공간산생해파전류。재결상정황하，전압시량분포변화，획취엄격적공간해우모형교위곤난。위해결상술문제，채용결상간화모형，장칠상전궤결일상급다상적각충정황진행건모，급출전압시량분포，병분별채용전통직접전구( DTC )화시량공제( VC)진행방진。전통DTC수침대불동결상정황선택불동시량，산법불구비통용성，차정자전류해파함량대，고속성능、대재능력하강명현；위차，제출개진형 UVM시량공제，무수침대특정결상정황，산법구유통용성，정자전류해파함량소，대재능력야고우전통DTC。
The seven-phase adjustable speed drive system has drawn more attention because of its typical open-phase fault operation in recent years. Under normal circumstance, based on the decomposition model and SVPWM, the voltage vectors were used in fundamental wave subspace for electromechanical energy conversion, as well as in harmonic wave subspace for harmonic components of currents. Under open-phase fault circumstance, it is difficult to get the rigorous decomposition model because of the asymmetrical structure and vector distribution, so a simple model was adopted. Aiming at each one of 11 kinds of 7-phase IM open-fault models, DTC and VC were simulated respec-tively. Compared with traditional DTC, the results show better commonality, higher load capacity and lower harmonic stator currents using VC with modified UVM.