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1.新能源电力系统国家重点实验室(华北电力大学),北京市 102206
2.中国南方电网有限责任公司超高压输电公司检修试验中心,广东省广州市 510663
郝晓宇(1998—),男,硕士研究生,主要研究方向:柔性直流输电换流站控制与切换。E-mail:2498719427@qq.com
郭春义(1984—),男,通信作者,博士,教授,博士生导师,主要研究方向:直流输电系统的稳定与控制、新能源并网与稳定控制等。E-mail:chunyiguo@outlook.com
蒋雯(1993—),女,博士研究生,主要研究方向:直流输电系统的建模与控制。E-mail:jw1205ncepu@163.com
收稿:2022-06-16,
修回:2022-10-16,
网络出版:2023-02-20,
纸质出版:2023-05-10
移动端阅览
郝晓宇,郭春义,蒋雯等.基于无功功率注入的MMC-HVDC交流电网等值阻抗识别方法[J].电力系统自动化,2023,47(9):184-192.
HAO Xiaoyu,GUO Chunyi,JIANG Wen,et al.Identification Method for Equivalent Impedance of AC Power Grid Connected to MMC-HVDC System Based on Reactive Power Injection[J].Automation of Electric Power Systems,2023,47(9):184-192.
郝晓宇,郭春义,蒋雯等.基于无功功率注入的MMC-HVDC交流电网等值阻抗识别方法[J].电力系统自动化,2023,47(9):184-192. DOI: 10.7500/AEPS20220616002.
HAO Xiaoyu,GUO Chunyi,JIANG Wen,et al.Identification Method for Equivalent Impedance of AC Power Grid Connected to MMC-HVDC System Based on Reactive Power Injection[J].Automation of Electric Power Systems,2023,47(9):184-192. DOI: 10.7500/AEPS20220616002.
交流电网等值阻抗反映了交流系统的强度,系统强度降低会给模块化多电平换流器型高压直流(MMC-HVDC)输电系统的稳定运行带来不利影响。为规避高阻抗/低强度给交直流系统带来的安全运行风险,实现复杂多变电网等值阻抗的迅速准确检测,文中以包含双端模块化多电平换流器的交直流系统为研究对象,提出了一种基于无功功率扰动注入的交流电网等值阻抗在线识别方法。首先,从理论角度介绍了无功扰动注入的阻抗识别原理,分析了交流电网电阻大小以及测量表计误差对阻抗识别精度的影响,构建了基于交流母线电压信息的阻抗识别精度评价指标。然后,基于此指标提出了无功功率扰动注入量的设计原则以及基于识别精度约束的交流电网等值阻抗在线识别方法。最后,通过仿真进行验证,证明了所提方法的可行性以及阻抗识别精度的可控性。
The equivalent impedance of the AC power grid reflects the strength of the AC system
and the reduction of the system strength will adversely affect the stable operation of the modular multilevel converter based high voltage direct current (MMC-HVDC) transmission system. In order to effectively avoid the safe operation risk of the AC/DC systems brought by high impedance/low strength and realize the rapid and accurate detection of the equivalent impedance of complex and changeable power grids
this paper proposes an online identification method of the equivalent impedance based on reactive power disturbance injection for the AC power grid with modular multilevel converters at both ends. First
the principle of impedance identification with reactive power injection is described from the theoretical perspective
and the influence of the resistance and measurement meter error on the impedance identification accuracy is analyzed. Then
an evaluation index for impedance identification accuracy based on AC bus voltage information is established. Based on this index
this paper proposes the principle to design the volume of reactive power disturbance injection and the online identification method for the equivalent impedance of the AC power grid based on the identification accuracy constraint. Finally
the feasibility of the proposed method and the controllability of the impedance identification accuracy are verified by simulation.
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