论文部分内容阅读
借助输电线路数据采集与监控(SCADA)系统量测的信息,建立输电线路温度及热平衡微分方程参数的连续估计,进行输电线路动态热定值(DTR)的软实现。首先,基于载流导体电阻与温度变化间明确的物理解析规律,利用输电线路两端量测建立输电线路电阻的扩展估计模型,从而间接得到输电线路温度;其次,考虑电阻变化的马尔可夫特性,利用相邻时刻的先验信息对估计电阻值进行修正,以提高估计精度;最后,利用已知输电线路温度序列,采用渐消递推最小二乘估计实现简化热平衡方程参数的估计,从而通过载流等电气量测间接实现了硬DTR设备的功能。以山东烟台电网实测数据验证了方法的可行性。
With the information of transmission line data acquisition and monitoring (SCADA) system measurement, the continuous estimation of transmission line temperature and heat balance differential equation parameters is established to realize the soft realization of DTR. First of all, based on the explicit physical analysis rule of current carrying resistance and temperature variation, an extended estimation model of transmission line resistance was established by measuring both ends of transmission line, and the transmission line temperature was obtained indirectly. Secondly, considering the Markov property of resistance change , A priori information of adjacent time is used to correct the estimated resistance value to improve the estimation accuracy. Finally, by using the recursive least-squares estimation, the estimation of the simplified thermal equilibrium equation parameters is achieved by using the known transmission line temperature sequence, Current-carrying electrical measurements indirectly achieve the functionality of a hard-DTR device. The feasibility of the method is verified by the measured data of Shandong Yantai Power Grid.