数学形态学用于高压直流输电线路行波保护的探讨

首先分析了高压直流输电线路行波传播特点及行波保护中的两个关键问题即行波滤波和波头捕获,继而详细介绍了数学形态学滤波技术和形态学梯度技术,并把它们成功地应用于直流输电线路暂态行波滤波和故障行波波头的捕获。仿真结果表明,形态滤波技术对于行波信号中的白噪声尤其是对于正负相间的脉冲噪声有很好的滤波能力;经形态学梯度变换后的暂态故障行波中的突变分量易于检测,这种基于数学形态学的行波保护方法在高压直流线路行波保护中具有良好的应用前景。

Study of travelling wave protection of HVDC transmission line on mathematical morphology

The paper firstly analyses the characteristic of traveling wave transmission in HVDC transmission line and presents two key problems in traveling wave protection named traveling wave filter and inspecting saltation signal of traveling wave.The mathematical morphology filter technology and morphology gradient technology are detailed,and has been successfully applied in HVDC transmission line traveling wave filter and saltation signal inspection.The simulation result proves that the morphology filter technology possesses good filtering ability to white noise,especially pulse noise in traveling wave signal and the saltation signal of fault traveling wave is easily inspected after mathematics morphology gradient transform.The traveling wave protection methods on mathematical morphology is predicted with good application prospects in HVDC transmission line traveling wave protection.