基于TLS-ESPRIT算法和综合影响指标的直流调制信号研究  

Research on DC power modulation signals based on TLS-ESPRIT and comprehensive affecting index

作　　者：刘霄涵[1] 王渝红[1] 李兴源[1] 瑚跃进 李青文[2] 

机构地区：[1]四川大学电气信息学院,成都610065 [2]国家电网公司西北分部,西安710048

出　　处：《电测与仪表》2016年第6期27-31,50,共6页Electrical Measurement & Instrumentation

摘　　要：直流调制信号对调制效果有重要的影响,为了选取合理调制信号以提升系统的暂态稳定性,提出一种基于总体最小二乘–旋转矢量不变技术算法(TLS-ESPRIT)和综合影响指标选取调制信号监测点的新方法,首先通过TLS-ESPRIT辨识扰动后预选监测点功率波动幅值,再综合考虑交流和直流的影响,定义综合影响指标并制定调制信号选取策略表。运用PSD-BPA程序,对实际电网模型进行仿真,结果表明该方法所选取输入信号明显优于其他预选信号,具有良好可行性,并通过改变系统结构证明了其鲁棒性。DCM signals can significantly influence the modulation effect. In order to select suitable DCM signals to improve the transient stability of power system,a novel method based on total least squares-estimation of signal parameters via rotational invariance techniques and comprehensive affecting index is proposed to select the best DCM signal.Firstly,power fluctuation amplitudes of preselected monitoring points are identified by TLS-ESPRIT. Then,the comprehensive affecting index and DCM signal selection strategy table are put forward,taking into account the influence of DC lines as well as interconnected AC lines. The simulation is conducted in real power grid models through adopting PSD-BPA,which shows the selected DCM signal is better than other preselected signals and this method has good feasibility. Meanwhile,the robustness of the proposed method is verified by changing system structures.

关 键 词：交直流系统 直流功率调制 TLS-ESPRIT 综合影响指标 信号选取策略表 

分 类 号：TM933[电气工程—电力电子与电力传动]