高压变频器同步投切功能的研究

摘要

Introduction was made to the basic principle and realizing method of main circuit of high-voltage inverter synchronous switching system. This paper gave the synchronous switching flow chart and its protective logic. On switching, by using software phase-locked loop technique, inverter output voltage was adjusted, as well as the grid voltage phase, amplitude, frequency in unifor-mity, then the switching between inverter and power was accomplished by the PLC and automatic switch. The test has verified the feasibility of the method, with higher site application value.%介绍了高压变频同步投切系统主回路的基本原理及实现方法，给出了同步切换流程及其保护逻辑，切换时利用软件锁相环技术调整变频器输出电压与电网电压的相位、幅值、频率一致，然后通过可编程控制器及自动开关完成变频与工频间的切换，试验验证了该方法的可行性，具有较高的现场应用价值。