电工技术学报  2022, Vol. 37 Issue (12): 3108-3116    DOI: 10.19595/j.cnki.1000-6753.tces.210846
电力系统与综合能源 |
辐射型直流配电网母线电压跌落峰值的定量计算方法
唐欣, 蔡明君, 唐惟楚, 岳雨霏, 尹子晨, 彭超
长沙理工大学电气与信息工程学院 长沙 410000
Quantitative Calculation Method of Bus Voltage Sag Peak Value in Radial DC Distribution Network
Tang Xin, Cai Mingjun, Tang Weichu, Yue Yufei, Yin Zichen, Peng Chao
School of Electrical and Information Engineering Changsha University of Science and Technology Changsha 410000 China
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摘要 区别于交流配电网,直流配电网中电源具有低惯性特性,当配电网负载突变时,直流母线电压波动较大,母线电压质量面临巨大挑战。在解决直流配电网惯性低的问题上,可采用超级电容增加物理惯性或者采用虚拟电容(需要变流器配置冗余容量提供)增加虚拟惯性,配置的电容越大,供电质量越高,但成本也会越高。然而,目前关于电容对电压跌落幅度抑制作用的研究以定性分析为主,缺乏定量计算。为此,该文对辐射型直流配电网中直流母线电压在负载突增下的暂态响应进行分析,求得母线电压跌落峰值与联络变流器直流侧电容值之间的数学关系,为系统惯性参数设计提供理论支持。由于获得的数学关系式比较复杂,为方便工程应用,设计简化方法,得到近似的代数关系。最后,利用仿真和实验对电压跌落峰值计算方法进行了验证,仿真与实验结果验证该文所提计算方法的正确性。
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唐欣
蔡明君
唐惟楚
岳雨霏
尹子晨
彭超
关键词 直流配电网低惯性特性电压跌落抑制电压跌落峰值计算    
Abstract:Different from AC distribution network, DC distribution network has low inertia characteristics. When the load of distribution network changes suddenly, DC bus voltage fluctuates greatly, and the quality of bus voltage faces great challenges. In order to solve the problem of low inertia of DC distribution network, super capacitor can be used to increase physical inertia or virtual capacitor (which needs to be provided by redundant capacity of converter configuration) to increase virtual inertia. The larger the capacitance, the higher the quality of power supply, but the higher the cost. However, the research on the suppression effect of capacitor on voltage sag is mainly qualitative analysis and lacks quantitative calculation. Therefore, the transient response of DC bus voltage under sudden load increase in radial DC distribution network is analyzed, and the mathematical relationship between the peak value of bus voltage sag and the DC side capacitance value of tie converter is obtained, which provides theoretical support for the design of system inertia parameters. Due to the complexity of the mathematical relation, a simplified method is designed to obtain the approximate algebraic relation for the convenience of engineering application. Finally, the calculation method of voltage sag peak value is verified by simulation and experiment.
Key wordsDC distribution network    low inertia characteristics    voltage sag suppression    calculation of voltage sag peak value   
收稿日期: 2021-06-14     
PACS: TM721.1  
基金资助:国家自然科学基金资助项目(51977013)
通讯作者: 蔡明君 男,1993年生,硕士研究生,研究方向为电力电子在电力系统中的应用。E-mail: 656632880@qq.com   
作者简介: 唐 欣 男,1975年生,教授,博士生导师,研究方向为电力电子在电力系统中的应用。E-mail: tangxin_csu@163.com
引用本文:   
唐欣, 蔡明君, 唐惟楚, 岳雨霏, 尹子晨, 彭超. 辐射型直流配电网母线电压跌落峰值的定量计算方法[J]. 电工技术学报, 2022, 37(12): 3108-3116. Tang Xin, Cai Mingjun, Tang Weichu, Yue Yufei, Yin Zichen, Peng Chao. Quantitative Calculation Method of Bus Voltage Sag Peak Value in Radial DC Distribution Network. Transactions of China Electrotechnical Society, 2022, 37(12): 3108-3116.
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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.210846          https://dgjsxb.ces-transaction.com/CN/Y2022/V37/I12/3108