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1.水路交通控制全国重点实验室(武汉理工大学),湖北省武汉市 430070
2.武汉理工大学自动化学院,湖北省武汉市 430070
方正(1999—),男,硕士研究生,主要研究方向:新能源发电并网稳定与控制。E-mail:867163054@qq.com
黄云辉(1986—),男,通信作者,博士,副教授,主要研究方向:新能源发电并网稳定与控制。E-mail:h.yunhui@whut.edu.cn
严文博(1999—),男,硕士研究生,主要研究方向:新能源发电并网稳定与控制。E-mail:574825652@qq.com
收稿:2024-01-13,
修回:2024-05-07,
网络出版:2024-07-03,
纸质出版:2024-10-10
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方正,黄云辉,严文博等.构网型变流器功率同步控制稳定性机理分析[J].电力系统自动化,2024,48(19):101-108.
FANG Zheng,HUANG Yunhui,YAN Wenbo,et al.Stability Mechanism Analysis of Power Synchronization Control for Grid-forming Converters[J].Automation of Electric Power Systems,2024,48(19):101-108.
方正,黄云辉,严文博等.构网型变流器功率同步控制稳定性机理分析[J].电力系统自动化,2024,48(19):101-108. DOI: 10.7500/AEPS20240113001.
FANG Zheng,HUANG Yunhui,YAN Wenbo,et al.Stability Mechanism Analysis of Power Synchronization Control for Grid-forming Converters[J].Automation of Electric Power Systems,2024,48(19):101-108. DOI: 10.7500/AEPS20240113001.
构网型变流器具有“主动构网”能力,可以为电网提供阻尼和频率支撑,但在低阻抗电网下存在稳定性问题。为了研究低阻抗下构网型变流器功率同步控制稳定性机理,首先,建立了体现功率同步动态特性的构网型变流器接入交流电网小信号模型。然后,以功率同步控制为主体,在牛顿动力学体系框架内,建立了构网型变流器接入低阻抗电网的动力学模型,将功率的偏移量分解为同步分量和阻尼分量,用以表征功率同步控制的稳定性。接着,结合模态分析和动力学特性分析,通过研究特征根轨迹和参与因子曲线,以及阻尼分量和同步分量的变化,分析了电网强度和控制参数等对功率同步控制的影响规律,揭示其内在机理。最后,通过构网型变流器接入电网的仿真模型验证了结论的正确性。
Grid-forming converters have the ability to actively construct the grid
which can provide damping and frequency support for the power grid
but there are stability issues in low-impedance power grids. In order to study the stability mechanism of power synchronization control for grid-forming converters with low impedance
firstly
a small-signal model of grid-forming converters connected to the AC power grid that reflects the dynamic characteristics of power synchronization is established. Then
within the framework of Newtonian dynamics
a dynamic model of grid-forming converters connected to the low-impedance power grid is established by taking power synchronization control as the main method and the power offset is decomposed into synchronous and damping components to characterize the stability of the power synchronization control. Subsequently
by combining modal analysis and dynamic characteristic analysis
the influence of power grid strength and control parameters on power synchronization control is analyzed by studying the characteristic root trajectory and participation factor curves
as well as the changes in damping and synchronization components
and their underlying mechanisms are revealed. Finally
the conclusion is verified through a simulation model of grid-forming converters connected to the power grid.
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