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1.国网江苏省电力有限公司,江苏省南京市 210000
2.国网江苏省电力有限公司电力科学研究院,江苏省南京市 211103
3.东南大学先进电能变换技术与装备研究所,江苏省南京市 210096
陈庆(1962—),男,硕士,研究员级高级工程师,主要研究方向:电力系统稳定与控制。E-mail:zhanxinstar@163.com
袁栋(1981—),男,本科,高级工程师,主要研究方向:直流配用电技术及应用、配电网智能运检及配电自动化。E-mail:13584225115@163.com
袁宇波(1975—),男,博士,研究员级高级工程师,主要研究方向:电力系统继电保护、直流输配电控制保护技术。E-mail:yyb97104@sina.com
陈武(1981—),男,通信作者,博士,教授,博士生导师,主要研究方向:电力电子功率变换、交直流配电网、新能源发电。E-mail:chenwu@seu.edu.cn
收稿:2021-12-03,
修回:2022-03-27,
网络出版:2022-08-03,
纸质出版:2022-11-10
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陈庆,袁栋,袁宇波等.多电压等级直流配电系统小信号稳定性评估方法[J].电力系统自动化,2022,46(21):80-88.
CHEN Qing,YUAN Dong,YUAN Yubo,et al.Small-signal Stability Assessment Method for DC Distribution System with Multiple Voltage Levels[J].Automation of Electric Power Systems,2022,46(21):80-88.
陈庆,袁栋,袁宇波等.多电压等级直流配电系统小信号稳定性评估方法[J].电力系统自动化,2022,46(21):80-88. DOI: 10.7500/AEPS20211203004.
CHEN Qing,YUAN Dong,YUAN Yubo,et al.Small-signal Stability Assessment Method for DC Distribution System with Multiple Voltage Levels[J].Automation of Electric Power Systems,2022,46(21):80-88. DOI: 10.7500/AEPS20211203004.
随着直流配电技术的快速发展,直流配电系统已逐渐呈现多电压等级、多直流母线、多电力电子变换器接入等显著特点。这导致变换器间的阻抗耦合关系更加复杂,系统稳定性问题突出。为评估多电压等级直流配电系统的小信号稳定性,首先建立了系统小信号等效模型。然后,根据相邻母线间直流变压器的不同控制模式,推导了母线电压与系统所有输入扰动间的统一传递函数表达式。在此基础上,提出了系统稳定性评估方法,并以含两个电压等级直流母线的配电系统为例,进一步分析了影响系统稳定性的阻抗因素,同时提出了基于系统等效环路增益的稳定判据。最后,设计了两种系统案例,并基于MATLAB/Simulink仿真平台验证了所提多电压等级直流配电系统稳定性评估方法的正确性。
With the rapid development of DC distribution technology
the DC distribution systems have gradually shown the remarkable characteristics of multiple voltage levels
multiple DC buses and multiple power electronic converter access
which leads to more complex impedance coupling relationship among converters and the increasingly prominent problem of system stability. In order to evaluate the small-signal stability of the DC distribution systems with multiple voltage levels
the small-signal equivalent model of the system is established
and then the unified transfer function from all system input disturbances to any bus voltage is derived according to the different control modes of the DC transformers between adjacent buses. On this basis
the system stability assessment method is proposed. Furthermore
a distribution system with two-voltage level DC buses is taken as an example to analyze the impedance factors affecting the system stability. At the same time
the stability criterion based on the system equivalent loop gain is proposed. Finally
two system cases are designed
and the correctness of the proposed stability assessment method of the DC distribution system with multiple voltage levels is verified based on MATLAB/Simulink simulation.
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