弱电网下双馈发电机输入导纳建模及稳定性分析

发布时间：2018-03-26 17:32

本文选题：双馈发电机　切入点：广义奈圭斯特判据　出处：《中国电机工程学报》2017年05期

【摘要】：弱电网条件下双馈风电机组控制系统与电网的交互影响目前得到了广泛的关注,传统的双馈电机变流器控制系统设计中并没有考虑电网阻抗的影响,因此该文采用阻抗分析方法分析了双馈风电变流器控制系统特性对双馈发电机并网稳定性的影响。首次在同步旋转坐标系下建立了考虑锁相环影响的双馈发电机输入导纳模型,建模过程中同时考虑了双馈发电机的电磁暂态特性和转子电流环控制器的影响。在此基础上,详细分析了锁相环和电流环控制器参数变化对双馈发电机输入导纳矩阵的影响。在所建模型的基础上对弱电网连接情况下的双馈发电机稳定性进行分析,利用广义奈圭斯特稳定判据分析电流环以及锁相环PI参数对于系统稳定性的影响,仿真结果验证了所建立模型和理论分析的正确性。
[Abstract]:At present, the interaction between the control system of doubly-fed wind turbine and the power grid has been paid more and more attention under the condition of weak grid, and the influence of grid impedance has not been taken into account in the traditional design of the control system of doubly-fed wind turbine converter. Therefore, the impedance analysis method is used to analyze the influence of the control system characteristics of the doubly-fed wind converter on the stability of the doubly-fed generator. The input admittance model of the doubly-fed generator considering the effect of phase-locked loop is established for the first time in the synchronous rotating coordinate system. The electromagnetic transient characteristics of doubly-fed generator and the influence of rotor current loop controller are considered in the modeling process. The influence of the parameters of PLL and current loop controller on the input admittance matrix of doubly-fed generator is analyzed in detail. The stability of doubly-fed generator under the condition of weak grid connection is analyzed on the basis of the established model. The influence of Pi parameters of current loop and phase locked loop on the stability of the system is analyzed by using the generalized Nigel stability criterion. The simulation results verify the correctness of the established model and the theoretical analysis.
【作者单位】：哈尔滨工业大学电气工程系;
【基金】：国家自然科学基金项目(51577040)~~
【分类号】：TM614

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