基于定频滞环控制的逆变器死区补偿研究

针对逆变器死区带来的控制精度下降、谐波含量增加等问题，提出一种基于定频滞环控制的死区补偿策略。介绍一种对相间电流误差进行控制的定频滞环控制方法，并利用扩张状态观测器对其中的扇区判断方法进行改进。通过开关动作前后的电流路径，分析出死区期间误差会超出滞环宽度上限或下限。实时计算误差超出环宽的幅度，调整实际环宽，使误差恰好符合预期环宽，达到死区补偿的目的。对基于定频滞环控制的逆变器进行仿真，证明了所提策略可以对死区进行精确补偿。

Research on Dead Time Compensation of Inverter Based on Constant Frequency Hysteresis Control

A dead time compensation strategy based on constant frequency hysteresis control is proposed to solve the problems of control accuracy degradation and harmonic content increase caused by inverter dead time. A constant frequency hysteresis control method for phase to phase current error is introduced, and the extended state observer is used to improve the sector judgment method. Through the current path before and after the switch action, it is analyzed that the error during the dead time will exceed the upper or lower limit of the hysteresis width. The magnitude of the error exceeding the loop width is calculated in real-time, and the actual ring width is adjusted to make the error just reach the expected ring width, so as to achieve the purpose of dead time compensation. The simulation of the inverter based on constant frequency hysteresis control verifies that the proposed strategy can accurately compensate the dead time.