考虑温度特性的全光纤电流互感器实时动态仿真模型

Real-Time Dynamic Simulation Model of Fiber Optical Current Transformer Considering Temperature Characteristics

利用电力系统实时数字仿真系统(real-time digital simulator,RTDS),研究并建立了全光纤电流互感器(fiber optical current transformer,FOCT)的实时动态仿真模型。通过对FOCT检测系统中偏差与反馈2部分的合理简化,建立了等效的数字闭环控制系统模型;根据不同温度下,光纤Verdet常数和l/4波片相位延迟的变化规律,以及探测器接收光强关于l/4波片参数的数学模型,将可变的温度参数引入到了模型中。通过仿真试验,找到了能够补偿温度误差的l/4波片初始相位延迟角的范围,证明了所建FOCT实时动态仿真模型是合理的,能够有效模拟FOCT的稳态温度特性,且暂态特性良好,可用于对FOCT性能的深入研究及智能变电站相关设备的测试。

With the help of the real-time digital simulator （RTDS）,thc paper studies and establishes the real-time dynamic simulation model of the fiber optical current transformer （FOCT）. The equivalent model of FOCT＇s digital closed loop control system is created by reasonably simplifying deviation and feedback of FOCT. Then the variable parameter is also introduced in that model, based on the change laws of the optical fiber Verdet constant and 2/4 wave plate phase delay and the mathematical model about 2/4 wave plate parameter of the light intensity received by the detector. The simulation results show that the real-time dynamic simulation model of FOCT built in this paper not only is reasonable, but also can simulate the temperature characteristic in steady state of FOCT effectively, what＇s more, its transient characteristic is not bad. It is useful for further study of FOCT＇s performance and testing for smart substation＇s correlative equipment.