• CSCD核心库收录期刊
  • 中文核心期刊
  • 中国科技核心期刊

电力建设 ›› 2019, Vol. 40 ›› Issue (7): 57-64.doi: 10.3969/j.issn.1000-7229.2019.07.008

• 智能电网 • 上一篇    下一篇

适用于交直流系统电磁暂态仿真的三序网络动态等值方法及其在华东电网的应用

杨林超1,楼伯良2,徐政1,周华3,华文2   

  1. 1.浙江大学电气工程学院,杭州市 310027;2.国网浙江省电力有限公司电力科学研究院,杭州市 310014;3.国网浙江省电力有限公司,杭州市 310007
  • 出版日期:2019-07-01
  • 作者简介:杨林超(1994),男,硕士研究生,主要研究方向为大规模交直流电力系统分析; 楼伯良(1965),男,高级工程师,主要从事电力系统稳定分析方面的研究工作; 徐政(1962),男,博士,教授,博士生导师,主要研究方向为大规模交直流电力系统分析、直流输电与柔性交流输电、风力发电技术与风电场并网技术、电力谐波与电能质量; 周华(1963),男,高级工程师,主要从事输电设备运维管理和技术监督方面的工作; 华文(1986),男,工程师,主要从事电力系统分析方面的工作。
  • 基金资助:
    国网浙江省电力有限公司科技项目(5211DS16001S)

A Dynamic Equivalent Method for Three-Sequence Network Applied to Electromagnetic Transient Simulation of AC/DC System and Its Application in East China Power Grid

YANG Linchao1, LOU Boliang2, XU Zheng1, ZHOU Hua3, HUA Wen2   

  1. 1. College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China; 2.Electric Power Research Institute, State Grid Zheijiang  Electric Power Co., Ltd., Hangzhou 310014, China;3. State Grid Zhejiang Electric Power Co., Ltd., Hangzhou 310007, China
  • Online:2019-07-01
  • Supported by:
    This work is supported by State Grid Zhejiang  Electric Power Co., Ltd. Research Program(No. 5211DS16001S).

摘要: 电磁暂态仿真能准确模拟交直流系统在不对称故障下的动态特性,为减小仿真计算量,提高仿真效率,需对大规模系统进行等值简化。提出了一种适用于交直流系统电磁暂态仿真的三序网络动态等值方法,该方法基于物理等效的动态等值技术,改进了低压网络标准等值结构,考虑了不对称短路故障时的负序和零序电流,采用了一种工程实用的等值发电机参数聚合和控制器模型选取方法,实现了等值前后主网各序网络阻抗相等,提高了等值系统在不对称故障下的仿真精度。该等值方法在网络简化过程中不会产生负电阻支路,同时避免了等值变压器负电阻和负电抗的出现,等值后的系统可直接用于电磁暂态仿真。最后开发了相应的等值软件,并将其应用于华东电网,等值结果验证了所提方法的有效性。

关键词: 大规模交直流系统, 电磁暂态, 动态等值, 三序网络, 不对称故障

Abstract: Electromagnetic transient simulation can accurately simulate the dynamic characteristics of AC/DC power system under asymmetric faults. In order to reduce the amount of simulating calculation and improve the simulation efficiency, it is necessary to simplify the large-scale power system. A dynamic equivalent method for three-sequence network applied to electromagnetic transient simulation of AC/DC system is proposed. On the basis of dynamic reduction technique for the physical equivalence, this method improves the standard equivalent structures of low-voltage networks, takes into account the negative sequence and zero sequence currents under asymmetric short-circuit faults, adopts a practical engineering method of parameter aggregation of equivalent generators and selection of controller models, makes the impedance of each sequence network of the trunk grid equal before and after the simplification, and gets better simulation accuracy of the equivalent system under asymmetric faults. This equivalent method does not produce negative resistance branches in the simplification process, and avoids the emergence of equivalent transformers with negative resistance or reactance. Thus, the equivalent system can be directly used in electromagnetic transient simulation. Finally, the corresponding equivalent software is developed and applied to the equivalence of East China Power Grid. Simulation results verify the effectiveness of the proposed method.

Key words: large-scale AC/DC power system, electromagnetic transient, dynamic equivalence, three-sequence network, asymmetric faults

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