基于FPGA的继电保护二次回路安全隐患监测及预警方法

Monitoring and Early-warning Method of Secondary Circuit Safety Hidden Danger in Relay Protection Based on FPGA

采用传统方法对继电保护二次回路安全隐患进行监测时,存在可靠性较低且稳定性较差的问题,为了提高继电保护二次回路的容错性能,提出基于FPGA的继电保护二次回路安全隐患监测及预警方法。构建继电保护二次回路的等效电路模型,以继电保护二次回路的输出电流有效值和三次谐波平面电流分量为约束变量,进行二次回路的各相定子电流稳定性分析,根据稳定性分析结果结合继电保护二次回路的实际运行工况进行安全隐患特征分析,从而提取单相断相故障等安全隐患状态下的特征量,根据特征量提取结果实现对二次回路安全隐患的监测及预警。测试结果表明,该方法能有效实现继电保护二次回路安全隐患监测及预警,稳定性较高,可靠性较好。

In order to improve the fault-tolerant performance of the secondary circuit of relay protection,a method based on FPGA for monitoring and warning the secondary circuit of relay protection is proposed.The equivalent circuit model of secondary circuit of relay protection is constructed.The equivalent circuit model of secondary circuit of relay protection is constructed.The output current RMS and the third harmonic plane current component of secondary circuit of relay protection are taken as constrained variables to analyze the stability of the stator current in each phase of secondary circuit.Based on the stability analysis results and the actual operation conditions of secondary circuit of relay protection,the potential safety hazard characteristics are analyzed,and the single-phase phase break phase is extracted.According to the result of feature extraction,the monitoring and warning of secondary circuit security hidden danger can be realized.The test results show that the method can effectively monitor and warn potential safety hazards in secondary circuit of relay protection,and has high stability and reliability.