电压源变流器死区效应分析及抑制策略

The dead-time effect is one of the main factors causing the nonlinear characteristics of the voltage source converter and will lead to the deterioration of the converter's operating performance. The specific impact of the dead-time effect on the converter and the problems existing in traditional dead-time compensation methods are analyzed in depth. A repetitive control strategy for the converter based on a new deadbeat control is proposed to suppress the dead-time effect. The control structure and principle of the proposed method are elaborated in detail, and its dead-time compensation performance and stability are analyzed in depth. The proposed method can effectively eliminate the current harmonics caused by the dead-time effect and correct the deviation of the output current, making it accurately track the command current. Compared with traditional dead-time compensation methods, the proposed method does not require an additional hardware detection circuit or a complex current polarity detection algorithm. The experimental results verify the correctness and superiority of the proposed method.

死区效应是引起电压源变流器非线性特性的主要因素之一，会导致变流器运行性能变差。深入分析了死区效应对变流器的具体影响及传统死区补偿方法存在的问题，提出一种基于新型无差拍控制的变流器重复控制策略，用于抑制死区效应。详细阐述了所提方法的控制结构和原理，对其死区补偿性能和稳定性进行了深入分析。所提方法能有效消除死区效应引起的电流谐波，并能校正输出电流的偏差，使其精确跟踪指令电流。相比于传统死区补偿方法，所提方法不需要额外的硬件检测电路或复杂的电流极性检测算法。实验结果验证了所提方法的正确性和优越性。