交流变频调速系统中的能量反馈控制

Energy Feedback Control in AC VFSR System

采用回馈能量的电磁制动可以达到节能的目的,而且,若能控制回馈电流大小,还可以灵活地调节制动转矩,达到精密制动。本文介绍采用有源逆变电路使直流电能回馈结交流电源,其途径是从电网取得控制信号,保证了有源逆变电路各晶体管导通规律,得以使逆变之交流电压和电网电在同步。同时,在逆变电路中,采用斩波电流控制,达到灵活控制回馈电流亦即制动转矩大小的目的。

To save energy, the electromagnetic brake with energy feedback is adopted. If the feedback current can be controlled, then the brake torque can also be controlled. This paper introduces a method to use active inverter to return DC energy back to AC source thereby achieving the purpose of controlling the brake torque flexibly.