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复数域加权最小二乘法在基于相量量测的状态估计
中的应用
复数域加权最小二乘法在基于相量量测的状态估计中的应用 复数域加权最小二乘法在基于相量量测的状态估计中的应用 Application of complex field weighted least square algorithm in state estimation based on phasor measurement ABSTRACT: State estimation based on phasor 得了很大的进展[4-8], 状态估计的实用化进程也 measurement can improve the accuracy of state. The 不断得以推进。
widely placed phase measurement uints(PMU) in 传统状态估计基于数据采集与监控high-voltage network provide a substantial foundation for (Supervisory Control and Data Acquisition, state estimation only using PMU. Studying state estimation SCADA) 系统提供的数据进行估计。
近年来, only using PMU is great significance. A measurement PMU 及建立在 PMU 基础上的广域测量系统 equation in complex domain is established, and the (Wide Area Measurement System, WAMS)不 complex field weighted least square algorithm(CWLS) , 断发展, 从而为状态估计提供了 新的数据源。
which needs no iteration to achieve estimation results,
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is PMU 有较高的采样速率和精度, 能够直接测量 introduced to solve the model. Research of phasor error 电压和电流的相角, 且采样数据都打上了高精度characteristics in complex domain and the robustness of 的时标, 因此数据的精度和速度相比 SCADA 系 CWLS algorithm are conducted, so as an effective method 统有着巨大的提升。
of choosing weight in CWLS as well as bad data 自 PMU 装备电力系统以来, 如何将 PMUidentification. The simulation results show the correctness 量测数据应用到状态估计中是一个比较热点的 of the model and the CWLS algorithm proposed is 研究方向, 国内外一大批科研工作者对此进行了 effective and strongly adaptive. 大量的研究, 取得了丰富的成果[9-13]。 这些研究 KEY WORDS:
phasor measurement unit;phasor error 大多是将 PMU 数据和 SCADA 数据进行混合, characteristics; linear state estimation; weight; improved 从而建立基于混合量测的估计模型, 但 PMU 和normalized residual SCADA 量测的采样周期不同, 且 SCADA 采样摘要:
基于相量量测的状态估计能提高状态估计的精没有时标, 难以保证两个系统采样数据的同步度, 而相量测量单元在高电压等级网络中的广泛配置为性, 从而大大影响了 估计...