基于变结构PI的空间矢量直接转矩控制系统研究

Research on direct torque control system of space vector modulation based on variable structure PI control

直接转矩控制技术以结构简单、动态响应快、鲁棒性强等优点受到国内外学者的广泛关注,但是传统直接转矩控制也存在转矩波动大、低速性能差等不足。将空间矢量调制技术(SVM)与直接转矩控制相结合为解决这一问题开辟了新的途径,然而采用PI控制的空间矢量转矩控制系统对系统外部扰动、参数摄动的鲁棒性较差。提出一种基于变结构PI的直接转矩控制方案,采用变结构与PI互相配合的控制方式,既保持了直接转矩控制转矩响应快速的优点,又发挥了变结构控制鲁棒性强的优势。仿真结果表明,该方案能有效改善直接转矩控制系统的性能。

Direct torque control （DTC）, which is characterized by fast dynamic response, structural simplicity and strong robustness, has widely received a lot of attention all over the world. However, the traditional DTC has several drawbacks, such as large torque ripple, and poor low-speed performance. Attempts to combine DTC with SVM have led to new ways. Nevertheless it is hard to achieve strong robustness to disturbance and parameter variation in direct torque control space vector modulation system. A new method based on variable structure PI control is presented, which preserves fast torque response merit of DTC, and shows robustness of variable structure control simultaneously. The simulation results verify that the performance of DTC is effectively improved by proposed method.