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首页> 外文期刊>International journal of electrical power and energy systems >Dynamic performance analysis, stability margin improvement and transfer power capability enhancement in DFIG based wind turbines at weak ac grid conditions
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Dynamic performance analysis, stability margin improvement and transfer power capability enhancement in DFIG based wind turbines at weak ac grid conditions

机译：基于DFIG的风力涡轮机在弱交流电网条件下的动态性能分析，稳定性裕度改善和传递功率能力增强

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摘要

Wind farms are usually located in remote areas far away from utility grid and load centers. Hence, long transmission lines, used between wind farms and utility grid, result in a low value for the grid strength at connection point. This paper first studies stability of the grid connected DFIG wind turbine taking the PLL dynamics into account, and then presents an efficient control approach to stabilize the system and to enhance transfer power capability at weak grid conditions. Hence, unified dynamic modeling of the whole DFIG, including dynamics of the PLL, stator flux, rotor current, drive train, dc-link, rotor side converter (RSC) and grid side converter (GSC) current controllers, dc-link voltage and generator speed controllers, and grid is presented. Then, small signal stability of the full system is carried out and impact of the grid short circuit ratio (SCR) on stability of the system is examined. Next, rotor control structure is modified to increase the stability margin and transfer power capability under weak grid conditions. By the modified control structure, the grid SCR is virtually increased to enhance the system performance at weak grid connections. Finally, results of theoretical analyses are verified by time domain simulations conducted in MATLAB-Simulink environment.
机译：风电场通常位于远离公用电网和负荷中心的偏远地区。因此，在风电场和公用电网之间使用较长的传输线会导致连接点处的电网强度值较低。本文首先研究了考虑到PLL动力学的并网双馈风力发电机的稳定性，然后提出了一种有效的控制方法来稳定系统并增强在弱电网条件下的传输功率能力。因此，对整个DFIG进行统一的动态建模，包括PLL，定子磁通，转子电流，传动系统，直流母线，转子侧转换器（RSC）和电网侧转换器（GSC）电流控制器，直流母线电压和发电机速度控制器和电网。然后，执行整个系统的小信号稳定性，并检查电网短路率（SCR）对系统稳定性的影响。接下来，修改转子控制结构，以增加弱电网条件下的稳定性裕度和传递功率的能力。通过修改后的控制结构，实际上提高了电网可控硅，以增强弱电网连接时的系统性能。最后，通过在MATLAB-Simulink环境中进行时域仿真来验证理论分析的结果。

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