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叙述了采用集成光学调制器的光纤电流互感器的工作原理。在此基础上分析了集成光学调制器调制系数随温度变化对光纤电流互感器测量精度的影响,对其产生的测量误差进行了仿真。在四态波调制的基础上,提出了对调制系数引起的调制通道增益变化进行补偿的反馈控制方法,有效降低了调制系数变化引起的测量误差。试验结果与理论分析一致,表明该方法有效。该方法同时还可以有效减小调制器调制系数随时间长期变化对光纤电流互感器测量精度的影响。
Describes the working principle of optical fiber current transformer with integrated optical modulator. Based on this, the influence of the modulation factor of the integrated optical modulator with temperature on the measurement accuracy of the optical fiber current transformer is analyzed, and the measurement error generated by it is simulated. On the basis of the four-state wave modulation, a feedback control method is proposed to compensate the variation of the modulation channel gain caused by the modulation coefficient, which effectively reduces the measurement error caused by the variation of the modulation coefficient. The experimental results are consistent with the theoretical analysis, indicating that the method is effective. The method can also effectively reduce the influence of the modulation factor of the modulator on the measurement accuracy of the optical fiber current transformer with long-term changes over time.