作　　者： (郭磊磊）; (金楠）; (窦智峰）; (杨小亮）;

机构地区： 郑州轻工业学院电气信息工程学院,河南省郑州市450002

出　　处： 《中国电机工程学报》 2017年第16期4810-4818,共9页

摘　　要： 模型预测控制因具有实现简单、控制灵活等优点而在大功率电压源逆变器控制领域受到广泛关注。然而,传统的模型预测控制方法因采用零矢量而导致共模电压较大。直接弃用零矢量的模型预测控制方法虽然可以减小共模电压,但仍然存在计算量较大、开关频率较高等问题。因此,提出了一种改进的永磁同步发电机(permanent magnet synchronous generator,PMSG)模型预测共模电压抑制方法。所提出的方法每个周期采用4个非零矢量进行优化运算,包含3个相邻非零矢量和1个不相邻非零矢量,从而降低了开关频率,且不影响电流控制。此外,文中还通过实验研究了所提出的共模电压抑制算法对PSMG转速控制的影响。实验结果表明,所提方法可以降低共模电压和开关频率,减小计算量,且不影响PMSG的电流和转速控制性能。 Model predictive control has received significant attention for high power voltage source inverters owing to its simplicity, as well as control flexibility. However, the common-mode voltage is large in the conventional model predictive control system due to the use of zero voltage vectors. Although the model predictive control method that directly abandons zero voltage vectors can reduce the common-mode voltage, it is computationally intensive and its switching frequency is high. Therefore, an improved model predictive control based common-mode voltage suppression strategy for permanent magnet synchronous generators （PMSGs） was proposed in this paper. In the proposed method, only four nonzero voltage vectors, including three adjacent nonzero voltage vectors and one non-adjacent nonzero voltage vector, were utilized to perform the optimization in every sampling period, resulting in switching frequency reduction with no adverse effects on the current response. Besides, the influence of the model predictive control based common-mode voltage reduction algorithm on the speed control of PMSG was tested in this paper. The experimental results confirm that the proposed strategy can reduce the common-mode voltage and switching frequency with less calculation effort, without affecting the current and speed control performance of PMSG.

关 键 词： 永磁同步发电机 模型预测控制 共模电压抑制 开关频率降低 计算量降低