基于RFE-BiLSTM模型的DFIG控制参数辨识方法

Control Parameter Indentification Approach for DFIG based on RFE-BiLSTM Model

  • 摘要: 双馈风机(doubly fed induction generator,DFIG)控制参数难以直接获取,导致无法建立准确的DFIG仿真模型,对大规模风电并网的电力系统仿真分析带来了较大阻碍,针对此问题,提出一种结合递归式特征消除(recursive feature elimination,RFE)和双向长短期记忆神经网络(bidirectional long short-term memory,BiLSTM)的DFIG控制参数辨识方法。首先,利用RT-LAB平台对实际DFIG控制器进行测试,获取其实测数据集;其次,将实测数据导入DFIG的Simulink仿真辨识模型,并利用自适应随机测试策略,改进遗传算法在实测数据集上搜索目标值生成BiLSTM的待训练数据集;然后,采用RFE-BiLSTM模型对DFIG的控制参数进行辨识,以获取DFIG控制器的关键控制参数;最后,通过实测算例对所提方法的有效性进行验证。结果表明,相比于长短期记忆网络和BiLSTM,所提RFE-BiLSTM模型的DFIG控制参数辨识方法不仅在全时间尺度和五段区间内辨识误差最低,而且辨识结果对多工况的适应性也最好。

     

    Abstract: The accurate acquisition of control parameters for doubly-fed induction generators (DFIGs) presents a significant challenge, which impedes the precise establishment of DFIG simulation models and poses substantial obstacles to the simulation analysis of large-scale wind power integration into power systems. To address this challenge, this study introduces a new control parameter identification approach for DFIGs that integrates recursive feature elimination (RFE) with bidirectional long short-term memory (BiLSTM) neural networks. First, the dynamic response measurement dataset of a real DFIG controller is acquired through the RT-LAB platform. Secondly, this dataset is utilized to populate the Simulink simulation identification model of the DFIG. Subsequently, the adaptive random test strategy is employed to enhance the performance of the genetic algorithm, which is then used to generate the training dataset for the BiLSTM. The RFE-BiLSTM model is utilized to identify the control parameters of the DFIG and obtain the key control parameters. Finally, the efficacy of the proposed method is validated through practical examples. The results indicate that, in comparison to the long short-term memory (LSTM) and BiLSTM models, the RFE-BiLSTM model presented in this paper exhibits the lowest identification error across the entire time scale and in five specific segments. Additionally, it is found that the adaptability of the identification results to various operating conditions is superior.

     

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