双馈风机与同步机小扰动功角互作用机理分析

发布时间：2018-10-17 11:18

【摘要】：研究风机与同步机动态间的交互作用机理对于揭示风电并网对电力系统小扰动功角稳定特性的影响,指导含大规模风电的电力系统稳定控制具有重要的理论价值和现实意义。该文针对单双馈风机单同步机无穷大系统,从动态响应互作用的角度分析双馈风机与同步机的交互作用机理。首先建立了同步机功角与双馈风机锁相环输出动态的小扰动分析模型。其次,基于小扰动分析模型解的特性,分析了不同锁相环输出动态对同步机功角动态响应的影响,以及同步机功角振荡对双馈风机锁相环输出动态的影响,揭示了双馈风机锁相环动态与同步机功角动态间的交互作用机理。研究结果表明,双馈风机锁相环和同步机动态间的交互影响与锁相环模态和同步机功角模态有关,当两模态振荡频率接近时,两模态阻尼特性将发生变化。最后,通过仿真与模态分析验证了该机理研究的正确性。
[Abstract]:It is of great theoretical value and practical significance to study the interaction mechanism between wind turbine and synchronous generator to reveal the influence of wind power grid connection on the power system stability characteristics of small disturbance angle and to guide the power system stability control with large-scale wind power. In this paper, the interaction mechanism between the double fed fan and the synchronous machine is analyzed from the point of view of dynamic response interaction for the infinity system of single double fed fan and single synchronous machine. Firstly, a small disturbance analysis model of the power angle of synchronous machine and the output dynamics of phase locked loop of doubly-fed fan is established. Secondly, based on the characteristics of the model solution of small disturbance analysis, the influence of output dynamics of different PLL on the power angle dynamic response of synchronous machine and the effect of power angle oscillation of synchronous generator on the output of PLL of doubly-fed fan are analyzed. The interaction mechanism between the phase locked loop (PLL) of doubly-fed fan and the power angle of synchronous machine is revealed. The results show that the interaction between the doubly-fed fan phase-locked loop and the synchronous machine dynamic is related to the phase-locked loop mode and the synchronous power angle mode. When the two-mode oscillation frequency approaches, the two-mode damping characteristic will change. Finally, the correctness of the mechanism is verified by simulation and modal analysis.
【作者单位】：新能源电力系统国家重点实验室(华北电力大学);
【基金】：国家重点基础研究发展计划项目(973计划)(2012CB215206) 国家自然科学基金项目(51477050;51190103)~~
【分类号】：TM712

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