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高频谐波扰动下直流电网阻抗模型特征分析
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作者单位:

华北电力大学新能源电力系统国家重点实验室,北京市 102206

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基金项目:

国家重点研发计划资助项目(2018YFB0904100);国家电网公司科技项目(SGHB0000KXJS1800685)。


Characteristic Analysis on Impedance Model of DC Grid with High-frequency Harmonic Disturbance
Author:
Affiliation:

State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources, North China Electric Power University,Beijing 102206, China

Fund Project:

This work is supported by National Key R&D Program of China(No.2018YFB0904100) and State Grid of China(No.SGHB0000KXJS1800685).

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    摘要:

    直流配电网故障发展迅速且无固定频率的特征分量,对其故障特征的准确解析有重要的研究意义。从直流故障状态下系统阻抗特性分析出发,重点研究各类直流换流器的频率-阻抗响应。基于DC/DC变换器和模块化多电平换流器谐波通路,根据元件参数特性进行合理等效与简化,建立了上述变换器的高频阻抗模型。所述模型不受换流器控制策略影响,能够精确反应各类换流器的高频阻抗特性。

    Abstract:

    The faults of DC distribution network develop rapidly and the frequency components are not fixed, thus the accurate analysis on fault characteristics has important research significance. From the perspective of impedance characteristic analysis in DC fault conditions, the frequency-impedance responses of various DC converters are studied. Based on the analysis of the harmonic path of DC/DC converter and modular multilevel converter (MMC), reasonable equivalence and simplification are carried out according to the component parameter characteristics, and the high-frequency impedance models of the converters are established. The proposed model will not be affected by the inverter control strategy, and can accurately reflect the high-frequency impedance characteristics of various types of converters.

    表 6 Table 6
    表 5 Table 5
    表 2 各工况下MMC的控制参数Table 2 Control parameters of MMC in different conditions
    表 3 Table 3
    表 1 各工况下DC/DC变换器的PI参数Table 1 PI parameters of DC/DC converter in different conditions
    图1 DC/DC变换器子模块结构图Fig.1 Structure diagram of DC/DC converter submodule
    图2 降压变换器中全桥子模块的高频谐波通路Fig.2 High-frequency harmonic path of full-bridge submodule in DC/DC buck converter
    图3 单个子模块等效电路Fig.3 Equivalent circuit of the single submodule
    图4 由直流侧注入的MMC高频谐波通路Fig.4 High frequency harmonic path of MMC injected from DC side
    图5 DC/DC变换器等效阻抗Fig.5 Equivalent impedance of DC/DC converter
    图6 MMC等效阻抗Fig.6 Equivalent impedance of MMC
    图 多光伏机组接入的环状柔性直流配电网络Fig. Flexible DC distribution network with multiple PV units connected
    图 DC/DC降压变换器结构图Fig. Structure of DC/DC buck converter
    图 DC/DC升压变换器结构图Fig. Structure DC/DC boost converter
    图 DC/DC变换器子模块高频阻抗模型Fig. Equivalent high frequency impedance model of a full bridge sub-module
    图 由交流侧注入的MMC高频谐波通路Fig. High frequency harmonic path of MMC injected by AC side
    图 MMC高频谐波等效电路Fig. High frequency equivalent impedance circuit of MMC
    图 MMC等效阻抗化简流程图1Fig. MMC equivalent impedance simplification structure 1
    图 MMC等效阻抗化简流程图2Fig. MMC equivalent impedance simplification structure 2
    图 MMC等效阻抗化简流程图3Fig. MMC equivalent impedance simplification structure 3
    图 MMC等效阻抗化简流程图4Fig. MMC equivalent impedance simplification structure 4
    表 4 Table 4
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引用本文

贾科,朱正轩,赵其娟,等.高频谐波扰动下直流电网阻抗模型特征分析[J/OL].电力系统自动化,http://doi.org/10.7500/AEPS20191118006.
JIA Ke,ZHU Zhengxuan,ZHAO Qijuan,et al.Characteristic Analysis on Impedance Model of DC Grid with High-frequency Harmonic Disturbance[J/OL].Automation of Electric Power Systems,http://doi.org/10.7500/AEPS20191118006.

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  • 收稿日期:2019-11-18
  • 最后修改日期:2020-04-02
  • 录用日期:2020-02-23
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