Abstract
As wind power on a large scale is connected to the grids through direct current transmission, the stability of the receiving-end grids drops off sharply and some of them become weak grids. In this paper, a modified virtual synchronous generator (MVSG) control strategy for receiving-end converter is proposed. Based on the traditional VSG active power-frequency loop control, this control strategy introduces the PI control of frequency deviation. Therefore, the converter can realize the no deviation control of the frequency, which can enhance the voltage and frequency stability of the receiving-end weak grid. On this basis, this paper proposes a coordinated power control method between wind farm and receiving-end grid, which solves the problem of power source of MVSG control. Finally, based on the Matlab/Simulink simulation software, a three-terminal model of wind power connecting to the receiving-end grids is established to verify the effectiveness of the proposed control strategy. The simulation results demonstrate that the proposed control strategy can reasonably allocate power and enhance the stability of the weak grid when load disturbance occurs in it.
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Acknowledgment
This work was supported by Science & Technology Project of State Grid Corporation of China: Research on key technologies of transient voltage stability analysis and control for multi-infeed DC receiving end power electronic grid (5100-202099271A-0-0-00).
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Qi, W., Wang, C., Liu, X., Fan, W., Duan, F. (2022). A Control Strategy for Modified the Stability of Weak Grid Integrated Wind Power on a Large Scale Through MMC-HVDC Transmission. In: Yang, Q., Liang, X., Li, Y., He, J. (eds) The proceedings of the 16th Annual Conference of China Electrotechnical Society. Lecture Notes in Electrical Engineering, vol 889. Springer, Singapore. https://doi.org/10.1007/978-981-19-1528-4_61
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DOI: https://doi.org/10.1007/978-981-19-1528-4_61
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