交流伺服系统逆变器死区效应分析与补偿新方法

死区效应的存在使得逆变器输出电压和电流不能跟踪参考电压和电流，同时输出增加了谐波分量，使系统的输出转矩存在很大脉动，尤其电机在低速运行时，可能导致系统的不稳定。针对此问题分析了死区效应对于交流伺服系统的影响，特别是低速运行时对电流波形的影响。提出了一种新型的在线延时补偿算法，该算法可以省掉开关器件没有必要的开通和关断，且不需要任何额外的硬件电路和离线的实验测量，具有实现简单、输出波形谐波含量小等特点，较好地降低了系统在低频时输出电流的脉动。仿真与实验表明该算法有效、可行。

Analysis and Compensation of AC Servo System on Inverter Dead-time Effect

The existence of inverter dead time makes the output voltage and current of inverter be different from its reference voltage and current. Dead time of inverter increases the harmonic of inverter output and makes the output torque of servo motor ripple largely. Especially in the condition of low speed，dead time may cause servo system unstable. The influence of inverter dead time on AC servo system, especially in the condition of low speed, was analyzed. A new on-line dead time delay compensation algorithm was proposed to improve the inverter output performance. The triggers for the inverter switches, additional circuits or off-line experimental measurement are unnecessary. The realization of the algorithm is simple and the harmonics in output waveform are small. The current ripple when the system works at the low frequency is reduced. Simulation and experimental results demonstrate the proposed algorithm is effective and feasible.