摘要
在分析全光纤电流互感器误差模型的基础上,提出基于加权最小均方误差准则的调制相位扰动补偿方案。通过引入加权函数因子,不断迭代加权函数得到期望调制相位。搭建实验系统对测试数据进行分析,实验结果表明:通过补偿能减小因实际制作中光纤非匹配性、非对称性带来的耦合器相位的微小偏移误差,从而提高全光纤电流互感器性能。分析两台样机在高低温箱内进行多日重复性测试的数据,在经过调制相位补偿后,两台样机多日内全温的归一化变化率在±0.2%以内,且重复性比较好,通过进一步优化,可满足0.2s级继电保护系统的使用要求。
The main phase error sources of all-fiber optical current transformer （FOCT） were analyzed, and a method based on the weighted least mean square error criterion was proposed. By introducing the weighted function factor, the phase offset was compensated by the iterative weighting function to obtain the expected phase modulation. The experimental system was established and the test data was analyzed. The experimental results show that the proposed method can reduce the deviation error caused by the fiber in actual production, and the performance of the FOCT is improved. In the low temperature box, the test data is analyzed by two prototypes for several days repetitive test. After the phase compensation, the normalized change is within±0.2%, and the repeatability is good in full temperature rate. The 0.2 s level of protection system requirements can be met.
出处
《中国测试》
CAS
北大核心
2016年第12期116-120,共5页
China Measurement & Test
基金
国网安徽省电力公司培训中心科技项目(2016QC06)
