Semimonthly
ISSN 1000-1026
CN 32-1180/TP
Semimonthly
ISSN 1000-1026
CN 32-1180/TP
LAI Qiping
Department of Electrical Engineering, Tsinghua University, Beijing 100084, ChinaSHEN Chen
Department of Electrical Engineering, Tsinghua University, Beijing 100084, ChinaYANG Yanchen
State Grid Jibei Electric Power Research Institute, Beijing 100045, ChinaLI Dongsheng
Department of Electrical Engineering, Tsinghua University, Beijing 100084, ChinaZHANG Jun
State Grid Jibei Electric Power Research Institute, Beijing 100045, China1.Department of Electrical Engineering, Tsinghua University, Beijing 100084, China;2.State Grid Jibei Electric Power Research Institute, Beijing 100045, China
The wind power connected sending-end grid is electrically far away from the main grid, lacking the support of synchronous generators, which shows distinct weak grid characteristics. Therefore, the voltage oscillation phenomenon is likely to occur, threatening the safe and stable operation of power systems. Its dynamic process and evolution mechanism need to be studied urgently. First, the conditions for voltage oscillation caused by repeated low voltage ride-through of wind turbines are analyzed through steady-state power flow calculation. Then, based on the switched system theory, considering the external connection impedance and internal control dynamics of the wind turbine, a switched system model for the grid-side converter of wind turbine is established. Next,by substituting relevant parameters, the dynamic evolution process of the terminal current, voltage, and power during the repeated low voltage ride-through period of the wind turbine is analyzed, and the mechanism of voltage oscillation is revealed. Finally, the voltage oscillation phenomenon of the wind turbine at the grid-connected point is reproduced through simulation, and the correctness of theoretical analysis results is verified. Furthermore, the main factors influencing the characteristics of voltage oscillations are explored as well.
This work is supported by State Grid Corporation of China (No. 4000-202214067A-1-1-ZN).
| [1] | LAI Qiping, SHEN Chen, YANG Yanchen, et al. Switched System Modeling for Repeated Low Voltage Ride-through of Wind Turbine and Mechanism Analysis of Voltage Oscillations[J]. Automation of Electric Power Systems,2025,49(7):46-56. DOI:10.7500/AEPS20240401001 |
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