考虑精细化主变声源模型的变电站噪声预测研究

Research on Noise Prediction of Substations Considering Refining the Sound Source Model for Main Transformer

变电站工程环境噪声污染水平已被纳入输变电工程建设控制指标。为了极大程度提高变电站噪声预测准确性,降低由工程前期噪声预测偏差造成决策失误,文章充分考虑主变压器的声源特性,分别建立了单一面声源、四面体声源和五面体声源模型,对比实测数据分析了3种声源模型的预测准确性。结果表明:主变压器采用不同声源模型变电站噪声预测结果差异显著;相比面声源,体声源模型预测结果更加接近实测值,四面体和五面体声源预测结果相近,但五面体声源预测更加准确;不同的工程设计阶段,所建模型精细化程度应有所差异,建议可行性研究阶段声源设备采用单一面声源或四面体声源模型建模,施工图设计阶段采用五面体声源模型建模。以已建成某750kV变电站为例,验证模型的实用性和有效性。

The environmental noise pollution level of substation engineering has been included in the construction control index of power transmission and transformation engineering.In order to greatly improve the accuracy of substation noise prediction and reduce the error in decision-making caused by the pre-project noise prediction deviation,this paper fully considers the sound source characteristics of the main transformer,and establishes an area sound source,a tetrahedral sound source and a pentahedral sound source model.Compared with the measured data,the prediction accuracy of the three sound source models is analyzed.The results show that:the main transformer adopts different sound source models and the substation noise prediction results are significantly different;compared with the area sound source,the prediction results of the volume sound source model are closer to the measured value.The prediction results of the tetrahedron and pentahedron sound sources are similar,but the pentahedron sound source is more accurate;the degree of refinement of the built model should be different in different engineering design stages.It is recommended that the area sound source or a tetrahedral sound source model is used for modeling in the feasibility study stage,and the pentahedral sound source model is used in the construction drawing design stage.The 750kV substation is taken as an example to verify the practicability and effectiveness of the model.