换流变压器户外相干噪声预测模型研究  

Coherent Noise Prediction Model Research of Converter Transformer

作　　者：阮学云[1,2] 李志远[1] 魏浩征[1] 

机构地区：[1]合肥工业大学噪声与振动工程研究所,合肥230009 [2]安徽理工大学机械学院,淮南232001

出　　处：《高电压技术》2015年第5期1664-1670,共7页High Voltage Engineering

基　　金："十一五"国家科技支撑计划重点项目(2006BAA02A21)~~

摘　　要：换流变压器户外噪声预测的准确与否直接影响着高压直流换流站的噪声评价和后续的噪声控制,目前户外噪声预测计算中因忽略了声线在边界多次反射产生的干涉效应,对噪声预测结果影响往往较大。因此在虚源法的基础上,通过对各虚源间的相干求和,考虑了声线多次反射形成的无限个虚源间的干涉效应,同时将各个不同的边界阻抗率加入到模型中去,建立了换流变压器的半开空间相干虚源模型。并应用该模型对某一具体换流变压器组的辐射声场进行计算,通过边界元模型、ISO9613模型计算结果与实测值进行对比。结果表明,该相干预测模型与边界元模型因考虑了相位信息,都能反映出声波在不同位置处的传播趋势,且2者计算结果基本一致,与实测值相比平均绝对误差<2 d B,ISO9613模型平均绝对误差则达到6 d B;而该研究提出的模型与边界元法相比,计算效率提高了约95倍,证明了所提理论模型的准确性和适用性,可应用于大范围的户外噪声预测计算。Outdoor noise prediction accuracy of converter transformer directly affects the evaluation and follow-up of noise control of the HVDC converter station, and the current outdoor noise prediction calculation often has a more remarkable in- fluence on noise prediction results because of ignoring the interference effects caused by multiple reflections of sound at the border. We established a converter transformer half-open space coherent source model on the basis of the image source me- thod considering the interference due to contributions from each image sources, adding various impedances of the boundary in the model at the same time. The proposed model was experimentally used to predict the coherent sound field of a speeific converter transformer group, and the results of the proposed model were respectively compared with the predicted by using the ISO9613 model, boundary element model, and the measured values. The results show that the coherent prediction model and the boundary element model can reflect the spread trend of the sound waves in different location by considering the phase, and the calculated results are basically in agreement. The mean absolute error is within 2 dB compared with the meas- ured values, but the ISO9613 model reaches 6 dB, furthermore, the computational efficiency of the proposed model improves about 95 times compared with the boundary element method. The above comparisons validate the proposed theoretical model, which can be used for a wide range of outdoor noise transmission calculation.

关 键 词：换流变压器 噪声预测 相干虚源法 半开空间 相位 边界阻抗 

分 类 号：TM401.2[电气工程—电器]