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考虑直流电抗器的电容型限流器特性及优化配置
作者:
作者单位:

1.东北电力大学电气工程学院,吉林省吉林市 132012;2.国电吉林江南热电有限公司,吉林省吉林市 132000

作者简介:

李国庆(1963—),男,博士,教授,博士生导师,主要研究方向:电力系统的安全性与稳定性分析、控制与决策、配电系统自动化。E-mail:LGQ@neepu.edu.cn
边竞(1994—),男,通信作者,博士研究生,主要研究方向:柔性直流输电技术。E-mail:bj_jjj@163.com
王鹤(1983—),男,博士,副教授,主要研究方向:分布式发电、微电网的运行与控制。E-mail:wanghe_nedu@163.com

通讯作者:

基金项目:

国家重点研发计划资助项目(2018YFB0904600)。


Characteristics and Optimal Configuration of Capacitive Current Limiter Considering DC Reactor
Author:
Affiliation:

1.School of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China;2.Guodian Jilin Jiangnan Thermal Power Co., Ltd., Jilin 132000, China

Fund Project:

This work is supported by National Key R&D Program of China (No. 2018YFB0904600).

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    摘要:

    直流电网故障电流抑制已成为相关领域必须面对且亟待解决的重要问题之一。现有的故障抑制方法大多采用单一元件,为充分抑制故障电流的上升速率与峰值,文中提出了综合直流电抗器和电容型限流器特性的故障抑制及优化配置方法。首先,基于模块化多电平换流器的故障等值电路,从抑制原理和动作时序2个角度分析了安装故障限流器的必要性;其次,计算分析了电感和电容对故障电流的抑制特性,并将等值电路和求解方法推广到直流环网中,以故障电流和直流电抗器为目标构建了优化配置模型;最后,将优化结果应用于PSCAD/EMTDC仿真模型中,与仅使用直流电抗器相比,该配置结果可进一步减小40%的故障电流且并未延长故障切除时间,表明综合使用直流电抗器与电容型限流器能够大幅度减小故障电流,降低直流断路器的开断容量。

    Abstract:

    Fault current limitation in DC power grid has become one of the important problems that must be faced and urgently solved in related fields. Most of the existing fault limitation methods adopt single component. In order to fully limit the rising rate and peak value of fault current, this paper proposes a fault limitation and optimal configuration method combining the characteristics of DC reactor and capacitive current limiter. Firstly, based on the fault equivalent circuit of modular multilevel converter, the necessity of installing fault current limiter is analyzed from two aspects of limitation principle and action sequence. Secondly, the limitation characteristics of inductance and capacitance to fault current are calculated and analyzed, and the equivalent circuit and solution method are extended to DC ring grid. The optimal configuration model is constructed with the objective of fault current and DC reactor. Finally, the optimization results are applied to PSCAD/EMTDC simulation model. Compared with the scheme using DC reactor only, the configuration results can further reduce 40% of the fault current without prolonging the fault clearance time. It is verified that the combination of DC reactor and capacitive current limiter can significantly reduce the fault current and the breaking capacity of DC circuit breaker.

    图1 MMC故障模型Fig.1 Fault model of MMC
    图2 保护装置动作时序Fig.2 Action sequence of protective devices
    图3 电容型限流器与直流断路器的配置Fig.3 Configuration of capacitive current limiter and DC circuit breaker
    图4 三端直流电网Fig.4 Three-terminal DC power grid
    图5 仅使用直流电抗器的故障电流Fig.5 Fault current using DC reactor only
    图6 优化配置后的故障电流Fig.6 Fault current after configuration optimization
    图 故障电流与电感值的关系Fig. Relationship between fault current and inductance
    图 故障电流与电容值的关系Fig. Relationship between fault current and capacitance
    图 直流电网等效电路Fig. Equivalent circuit of DC power grid
    图 i 121计算值Fig. Calculated value of i 121
    图 i 122计算值Fig. Calculated value of i 122
    图 仅采用直流电抗器的电流变化图Fig. Current change using DC reactor only
    图 加装电容型限流器的电流变化图Fig. Current change diagram of capacitive current limiter
    图 算法流程图Fig. Flow chart of algorithm
    图 Pareto最优解集空间分布Fig. Spatial distribution of optimal Pareto solution set
    图 存档最优值对应目标函数值Fig. Objective function values corresponding to archive optimal values
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引用本文

李国庆,边竞,王鹤,等.考虑直流电抗器的电容型限流器特性及优化配置[J].电力系统自动化,2020,44(5):23-29. DOI:10.7500/AEPS20190607003.
LI Guoqing,BIAN Jing,WANG He,et al.Characteristics and Optimal Configuration of Capacitive Current Limiter Considering DC Reactor[J].Automation of Electric Power Systems,2020,44(5):23-29. DOI:10.7500/AEPS20190607003.

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历史
  • 收稿日期:2019-06-07
  • 最后修改日期:2019-11-09
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  • 在线发布日期: 2020-03-08
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