变电站母线短路容量就地测量方法
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邓朴(1963-),男,硕士,教授级高级工程师,主要从事电力系统稳定与控制研究;E-mail:2410406553@qq.com

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国家自然科学基金(51567005)


Research on the local measurement method of bus short-circuit capacity for the electricity substation
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    摘要:

    母线短路容量是电力系统运行与控制所需的关键参数,在线测量短路容量对电网实现可观性和可控性至关重要。通过对并联电容器投切引起母线电压扰动,并根据电压扰动进行电网母线短路容量的在线测定。首先,基于变电站电路模型,采用线性电路的替代定理和叠加原理,推导母线短路容量测量的精确计算方法。所提方法揭示电容器投切引起的电压矢量相位变化是影响测量精度的关键因素,突破既往研究的近似公式,具有很高的精确性;其次,进一步提出电压矢量相位差的迭代计算方法,该方法比直接测量更加方便可靠。最后,基于 Matlab/Simulink建立变电站母线及在线测量模型,对多种场景的仿真分析,结果表明,所提方法测量误差小于1%,技术上易于实施和实用化推广。

    Abstract:

    The short-circuit capacities of buses are key parameters required for the operation and control of power systems. On-line measurement of short-circuit capacity is an effective method to achieve the observability and controllability of power grids. This paper proposes an on-line measurement method to estimate the short-circuit capacity of the grid bus according to the bus voltage fluctuation triggered by switching the parallel capacitors. Firstly, based on the circuit model of substation and the substitution and superposition theorem of the linear circuit, an accurate calculation method for measuring the bus short-circuit capacity is derived. It reveals that the phase-angle differences of the voltage vector caused by the capacitor switching is a crucial factor affecting the measurement accuracy, which is an important improvement compared with the approximate formula of previous studies. The proposed measurement method has high precision. The proposed iterative calculation method for the voltage vector phase difference is more convenient and reliable than the direct measurement. The effectiveness of the proposed on-line measurement method is tested on a detailed substation bus model on Matlab/Simulink. According to the tests in various situations, the simulation results show that measurement error of the proposed method is less than 1%.

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邓朴,郝正航,薛毅,张广梅,陈薇.变电站母线短路容量就地测量方法[J].电力科学与技术学报,2021,(2):192-198. Deng Pu, Hao Zhenghang, Xue Yi, Zhang Guangmei, Chen Wei. Research on the local measurement method of bus short-circuit capacity for the electricity substation[J]. JOURNAL OF EIECTRIC POWER SCIENCE AND TECHNOLOGY,2021,(2):192-198.

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  • 在线发布日期: 2021-05-08