全光纤电流互感器PID控制算法研究

全光纤电流互感器（FOCT）克服了传统电磁式电流互感器在暂态响应方面的弱点,优化动态特性有助于提高全光纤电流互感器保护动作的快速性。全光纤电流互感器的检测电路的带宽限制了系统的闭环带宽。对于采用数字闭环方案的全光纤电流互感器,其带宽限制主要由闭环数字控制算法决定。通过理论分析、仿真及实验验证,表明在闭环控制算法中引入PID控制算法,有效提高了闭环带宽,为全光纤电流互感器在智能电网保护中的推广应用具有重要的意义。

Theory on PID controller of fiber optic current transformer

Fiber optic current transformer (FOCT) can overcomes the disadvantage of traditional electromagnetic current transformer in transient current response, sensitivity and reliability of protective action can be remarkably improved by optimization of dynamic characteristics. The closed loop control algorithm is a main limitation to the detection bandwidth of the FOCT based on the closed loop signal detecting scheme. The theory analysis and experiment show that the bandwidth of closed loop FOCT is greatly improved by introducing the PID control algorithm. It is of great significance for the promotion and application of fiber current transformer in smart grid protection.