基于SVD-prony的消除暂态超越的新算法

摘要

提出一种基于奇异值分解的普罗尼SVD-prony(singular value decomposition-prony)的可有效消除暂态超越的距离保护新算法.首先,用prony(普罗尼)算法在半个周波内对故障信号进行分析,并用奇异值分解的方法确定模态阶数,实现故障电气量的较精确估计；其次,根据SVD-prony拟合误差构造自适应判据,修正距离保护的整定值,进一步避免暂态超越.参照中国电力科学研究院西北750kV线路动模实验参数,建立ATP仿真模型,结合Matlab仿真保护程序,验证了所提算法的可行性和实用性.%A novel algorithm for eliminating the transient overreach in distance protection based on singular value decomposition prony(SVD-prony) was proposed in the paper. The prony algorithm is used to analysis the fault signal of half cycle, and the modal order is determined by singular value decomposition, which reduces the impact of the noise on the prony algorithm and realizes more precise calculation. Then an adaptive criterion have been constructed to amend the distance protection settings according to the fitted error, which as a result, can avoid transient overreach Combining with MATLAB simulation protection program, a ATP simulation model was set up referencing to the Northwest 750kV line parameters from China Electric Power Research Institute. Simulation result verifies the feasibility and practicality of the proposed algorithm.