基于零序电压调控的配电网对地泄漏电阻测量技术
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白浩(1987-),男,博士,工程师,主要从事配电自动化、主动配电网、人工智能应用研究;E-mail:baihao@csg.cn

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TM76

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广西电网有限责任公司科技项目(ZBKJXM20190061)


Measurement technology of grounding leakage resistance of distribution network based on zero sequence voltage regulation
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    摘要:

    由于大多数传统的配电网对地参数测量方法主要针对配电网对地电容的准确测量,而对地泄漏电阻测量并不精确,且无法消除对地参数测量过程中的消谐电阻和电压互感器内阻抗产生的影响,致使测量结果误差较大;同时,传统测量方法不能广泛适用于不同系统接地方式情况,实际应用较为不便。为此,提出一种基于零序电压调控的配电网对地泄漏电阻测量方法,选择配电网外接特制的带有分接抽头的Y/△接线接地变压器上合适的分接抽头接地,获得一个较小的零序电压,并测量出此时的系统零序电流,将所得电压和电流值通过运算得到系统对地泄漏电阻。利用PSCAD/EMTDC仿真软件对提出的对地泄露电阻测量方法进行仿真验证分析,所得测量结果误差小,且适用于不同的系统接线方式,表明了该方法测量精度高,适用性广,且安全经济,使用便捷。

    Abstract:

    Asmost of the traditional measurement methods for the ground parameters of distribution network are mainly focus on the accurate measurement of the grounding capacitance, the grounding leakage resistance measurement is not accurate. The influence of the harmonic elimination resistance and the internal impedance of the voltage transformer is impossible to be eliminated during the measurement of the ground parameters. The issues mentioned above may result in a large error in the grounding leakage resistance measuring result.Furthermore, traditional measurement methods cannot be widely applied to different system grounding methods, and practical application is relatively inconvenient. To this end, this paper proposes a method for measuring the grounding leakage resistance of distribution network based on zero-sequence voltage regulation. In the proposed method, a small zero sequence voltage is obtained byselecting the appropriate shunting tapon a special Y/△-connected grounding transformer with shuntingtaps in the distribution network to ground.The corresponding zero sequence current of the system is measured.The grounding leakage resistance of the system can be calculated through the obtainedvoltage and current values. The PSCAD/EMTDC simulation software is used to verify and analyze the proposed grounding leakage resistance measurement method. The simulation resultsshow thatthe calculation method is applicable to different system connection mode with small measuring error,which indicates that theproposed method has the advance of high measurement accuracy, wide applicability, safety, economy and convenient use.

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白浩,欧阳健娜,潘姝慧,等.基于零序电压调控的配电网对地泄漏电阻测量技术[J].电力科学与技术学报,2022,37(3):126-132.
BAI Hao, OUYANG Jianna, PAN Shuhui, et al. Measurement technology of grounding leakage resistance of distribution network based on zero sequence voltage regulation[J]. Journal of Electric Power Science and Technology,2022,37(3):126-132.

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  • 在线发布日期: 2022-07-24
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