Constant switching frequency (CSF) is an important objective to be achieved by any control strategy deployed on a Voltage Source Inverter (VSI) so that the filter design will be easier. Though the invent of Multi-Level Inverters (MLI’s), the Two-Level Inverters (TLI’s) are widely used when it comes to current control strategies. In this paper, a new hysteresis current control strategy is proposed for a TLI in order to achieve nearly CSF. In this method, the constant switching frequency is achieved by creating a Variable Band (VB), which varies according to the switching frequency average of the pole voltage. The proposed control strategy creates VB’s such that it mimics the Continuous Space Vector Pulse Width Modulation (CSVPWM) and also the Bus-Clamping Pulse Width Modulation – 60° and 30° (BCPWM60 – BCPWM30). The paper also analyses the proposed control strategy under different criteria such as current THD, dynamic performance and parameter variation. This performance of the proposed strategy is simulated using MATLAB Simulink platform and experimentally validated on a 2.2 kW, three phase, Induction Motor (IM) using dSPACE-1103 kit.

恒定开关频率 (CSF) 是部署在电压源逆变器 (VSI) 上的任何控制策略都要实现的一个重要目标，这样滤波器设计将变得更加容易。尽管发明了多电平逆变器 (MLI)，但就当前的控制策略而言，两电平逆变器 (TLI) 得到了广泛使用。在本文中，为 TLI 提出了一种新的滞后电流控制策略，以实现接近 CSF。在这种方法中，恒定的开关频率是通过创建可变频带 (VB) 实现的，可变频带根据极电压的平均开关频率而变化。建议的控制策略创建 VB，使其模仿连续空间矢量脉冲宽度调制 (CSVPWM) 以及总线钳位脉冲宽度调制 – 60° 和 30° (BCPWM60 – BCPWM30)。本文还分析了在电流 THD、动态性能和参数变化等不同标准下所提出的控制策略。所提出策略的这种性能使用 MATLAB Simulink 平台进行仿真，并使用 dSPACE-1103 套件在 2.2 kW 三相感应电机 (IM) 上进行实验验证。