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首页> 外文期刊>Renewable Power Generation, IET >Small-signal stability of power system integrated with ancillary-controlled large-scale DFIG-based wind farm
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Small-signal stability of power system integrated with ancillary-controlled large-scale DFIG-based wind farm

机译：与辅助控制的大型基于DFIG的风电场相集成的电力系统的小信号稳定性

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In this study, small-signal stability of the power system integrated with ancillary-controlled large-scale doubly fed induction generator (DFIG) based wind farm (WF) is studied. A model which considers grid code requirements and ancillary controllers is presented to indicate important DFIG dynamics for the study. The ancillary control of the WF which aims to improve power system voltage/frequency stability is evaluated from the small-signal stability perspective. It is shown that the ancillary controller deteriorates power system low-frequency oscillations and/or induces new lightly damped oscillation modes especially in a weak grid. The potential risks may restrict the WF to fulfil gird code requirements and threaten small-signal stability of the power system. Meanwhile, this study reveals that wind power penetration level and WF connection impedance are two main factors which affect dynamic interactions between the WF and the power system and thus affect system small-signal stability. The principle of the influence on the small-signal stability with different grid weakness and ancillary control schemes is evaluated in this study by eigenvalue analysis and verified with time-domain simulations.
机译：在本研究中，研究了基于辅助控制的大型双馈感应发电机（DFIG）的风电场（WF）集成的电力系统的小信号稳定性。提出了一个考虑网格代码要求和辅助控制器的模型，以指示该研究的重要DFIG动态。从小信号稳定性的角度评估了旨在改善电力系统电压/频率稳定性的WF辅助控制。结果表明，辅助控制器会恶化电力系统的低频振荡和/或引起新的轻微衰减的振荡模式，尤其是在弱电网中。潜在的风险可能会限制WF满足电网规则要求，并威胁到电源系统的小信号稳定性。同时，该研究表明，风电渗透水平和风电连接阻抗是影响风电与电力系统之间动态相互作用并影响系统小信号稳定性的两个主要因素。本研究通过特征值分析评估了不同网格弱点和辅助控制方案对小信号稳定性的影响原理，并通过时域仿真进行了验证。

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