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同步相量测量装置校准器参考相量计算方法
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新能源电力系统国家重点实验室(华北电力大学), 北京市 102206

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国家重点研发计划资助项目(2017YFB0902901)


Reference Phasor Calculation Method for Calibrator of Synchronous Phasor Measurement Unit
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State Key Laboratory of Alternate Electric Power System with Renewable Energy Sources(North China Electric Power University), Beijing 102206, China

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    摘要:

    电力电子设备的广泛应用导致电力系统逐渐出现了新的稳定性与可靠性问题,亟需高精度实时测量与感知技术,为解决上述问题提供数据基础。作为最有效的动态监测手段之一,同步相量测量装置(PMU)的测量精度至关重要。提出了一种PMU校准器的参考相量计算方法,为PMU测试提供校准参考值。该方法分析了电力系统典型静动态信号特性,建立了基波相量通用信号拟合模型,可表征PMU测试标准中除阶跃测试外的所有静动态测试信号。提出了基于非线性拟合的相量幅值、相角与频率迭代求解方法,并根据所得频率提出了基于最小二乘法的频率变化率计算方法。进一步,分析揭示了迭代初始值、计算时间窗长和拟合阶数对计算精度的影响及其设置方法。仿真与实验测试结果表明,该方法精度至少比标准规定的精度要求高1个数量级,可用于PMU的测试与校准。

    Abstract:

    The wide application of power electronic equipment has brought about new problems of stability and reliability in power system. It is urgent to use high-precision real-time measurement and sensing technology to provide the data base. As one of the most effective dynamic monitoring devices, the measurement accuracy of phasor measurement units(PMUs)is very important. A reference phasor calculation method for PMU calibrator is presented, which provides reference measurements for PMU test. The characteristics of typical static and dynamic signals in power system are analyzed, and a general signal fitting model for a fundamental phasor is established, which can characterize the time-varying characteristics of phasor parameters besides step test signals. An iterative method for solving the amplitude, phase angle and frequency of the phasor based on nonlinear fitting is proposed, and a calculation method for the rate of change of frequency(ROCOF)based on the least squares method is proposed according to the measured frequency. Furthermore, the influence of the iterative initial value, observation window length, and fitting order on the measurement accuracy and the setting method are analyzed. The simulation and experimental results show that the accuracy of the proposed method is at least one order of magnitude higher than the requirements defined in PMU standards. Therefore, the proposed estimation method can be applied to the test and calibration of PMUs.

    图1 不同n和TL下的幅值误差Fig.1 Amplitude error under different n and TL
    图2 不同n和TL下的相角误差Fig.2 Phase error under different n and TL
    图3 校准器参考相量算法流程图Fig.3 Flow chart of the reference phasor algorithm
    图4 基于PMU校准器的测试框图Fig.4 Test diagram based on PMU calibrator
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许苏迪,刘灏,毕天姝.同步相量测量装置校准器参考相量计算方法[J].电力系统自动化,2019,43(17):168-175. DOI:10.7500/AEPS20180723018.
XU Sudi, LIU Hao,BI Tianshu.Reference Phasor Calculation Method for Calibrator of Synchronous Phasor Measurement Unit[J].Automation of Electric Power Systems,2019,43(17):168-175. DOI:10.7500/AEPS20180723018.

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历史
  • 收稿日期:2018-07-23
  • 最后修改日期:2019-04-19
  • 录用日期:2018-09-30
  • 在线发布日期: 2019-03-26
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