光纤自愈环网电流纵差保护的数据同步方法

针对基于数据通道的同步方法不能适应光纤自愈环网通信路由的变化，提出了基于分布参数线路模型的同步算法。该方法利用分布参数线路模型，分别从线路两端计算保护安装处的电流相模量或电压相模量作为数据同步比较的依据，采用相位比较结合数据修正的方法进行采样数据同步处理。该方法同步速度快，不受通信路由变化、线路参数变化和谐波的影响，能够解决电流纵差保护在光纤自愈环网中的采样数据同步问题。ATP仿真和试验结果表明其同步精度满足电流纵差保护的要求。

Data Synchronization Method for Current Differential Protection Using Fiber Optic Self-cure Ring Network

In view of the failure of data channel-based synchronization method to adapt to the communication route variation using a fiber optic self-cure ring network, a synchronization algorithm based on the distributed parameter line model is proposed to overcome the above limitation. This method consists in calculating the current phase or voltage phase modules at each of the two ends of the transmission line at the relay location, respectively, which is used as the basis of data synchronization comparison. By combining phase comparison with data revision, the data will be synchronously processed. Characterized by quick synchronization of sampled data and freedom from the influences of communication route variation, transmission line parameter variation and harmonics, this method is capable of resolving the data synchronization for current differential protection using the fiber optic self-cure ring network. The results of ATP simulation and experimental tests show that the method proposed is valid and can satisfy the synchronization accuracy requirements of current differential protection.