浙江电力

2020, v.39;No.291(07) 1-6

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基于场路耦合和土壤参数优化的直流偏磁治理研究
Research on DC Bias Treatment Based on Field-circuit Coupling and Soil Parameters Optimization

朱克平,邱逸,何英静,李贤良,胡斌,邹国平
ZHU Keping,QIU Yi,HE Yingjing,LI Xianliang,HU Bin,ZOU Guoping

摘要(Abstract):

针对广域大地条件下交流电网的直流偏磁评估与治理问题,基于场路耦合法建立了考虑线路实际运行拓扑与运行方式的直流偏磁计算模型,并提出基于试验数据的土壤模型参数优化方法,以提高模型计算精度。将上述方法应用到丽水电网2019年实际网络拓扑下的直流偏磁风险治理中,结合3次直流偏磁试验测量结果对土壤模型参数进行优化,优化后偏磁电流仿真结果与实测值的偏差减小了44%~69%。利用优化后的计算模型,结合偏磁电流的转移特性给出了综合直流偏磁治理方案,该方案可供大型交流电网的直流偏磁分析与治理参考。
For DC bias estimation and treatment for AC power grid under the condition of wide-area earth, a DC bias simulation model considering the real topology and operating mode of power system based on the field-circuit coupling is built in this paper, and a soil model parameters optimization method based on test data is proposed to improve the calculation accuracy of the model. The model is applied in the DC bias treatment of Lishui power grid in its 2019 topology and the soil model parameters are optimized according to three DC bias tests. The simulation error of DC-bias current reduces by 44%~69% after optimization. DC bias treatment scheme is further proposed via the optimized calculation model and in combination with the transfer characteristics of DC bias current. The proposed method provides a reference for the analysis and treatment of DC bias in a large-scale AC power grid.

关键词(KeyWords): 直流偏磁;系统运行方式;土壤参数优化;场路耦合
DC bias;operating mode of power system;soil parameters optimization;field-circuit coupling

Abstract:

Keywords:

基金项目(Foundation): 国网浙江省电力有限公司科技项目(5211DS180039)

作者(Author): 朱克平,邱逸,何英静,李贤良,胡斌,邹国平
ZHU Keping,QIU Yi,HE Yingjing,LI Xianliang,HU Bin,ZOU Guoping

DOI: 10.19585/j.zjdl.202007001

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