摘要
近年来,由于输送容量大、线路损耗低等优势,特高压输变电网络在国内大量建设并逐步完善,其中即涵盖噪声治理等环保问题。安装于特高压变电站厂界附近的并联电抗器主要以100 Hz的低频声波向外辐射噪声。由于三相近邻安装,存在明显的声波干涉现象。当干涉极大值位于厂界噪声敏感点(或监测点)时,便有噪声超标的风险。此时,可通过改变声传播途径等降噪方法控制声场干涉条纹,进而达到改善敏感位置噪声现状的目的。按照这种权宜方法实现噪声控制的前提是研究高抗设备的干涉分布规律,以及影响干涉的诸多因素。分析比较相关文献中常用的同相振动声源与实测高抗振动声源的差别,指出高抗表面振动同相假设的不足。利用实测高抗表面振动建立高抗声场的仿真模型,并在此基础上探讨防火墙设置、墙面吸声系数和地面吸声对高抗干涉声场的具体影响。研究结果表明,特高压并联电抗器声源同相假设具有一定的局限性,而对厂界敏感点的噪声控制来说,防火墙尺寸并非越大越好(在本例中防火墙高度为2 m时,敏感点声压最低)。提出的改善特高压变电站高抗厂界附近噪声敏感点声压级的工程方法,可为特高压变电站厂界噪声治理提供一种新的思路。
In recent years,due to the advantages of large transmission capacity and low line loss,the UHV transformation networks are constructed and improved gradually,which meanwhile induces noise control and environmental protection issues.The shunt reactor installed near the boundary of the UHV substation mainly radiates noise outward with low-frequency sound waves of 100 Hz.Due to the three-phase close-up installation,there is an obvious acoustic interference phenomenon.When the maximum interference point is located at the noise sensitive point(or monitoring point)in the plant boundary,there is a risk of noise exceeding the standard.At this time,the interference fringes of the sound field can be controlled by noise reduction methods such as changing the sound propagation path,thereby the purpose of improving the status of noise at sensitive locations can be achieved.The premise of noise control according to this expedient method is to study the interference distribution law of high-resistance equipment and several factors affecting the interference.This paper analyzed and compared the difference between the in-phase vibration sound source commonly used in related literatures and the measured high-vibration sound source,and pointed out the deficiency of the in-phase assumption of high anti-surface vibration.A highresistance sound field simulation model was established based on the measured high-resistance surface vibration data,and the specific effects of firewall settings,wall sound absorption coefficients,and ground sound absorption on the high-resistance interference sound field were discussed.The research results show that the assumption of in-phase sound source of UHV shunt reactors has some limitations.For the noise control of sensitive points in the factory boundary,the larger size of the firewall does not mean the better noise control effect always.In this example,when the height of the firewall is 2 m,the sensitive point has the lowest sound pressure.The proposed method provides a new idea for noise control at
作者
蔡萱
马玉圣
许超
CAI Xuan;MA Yusheng;XU Chao(Electric Power Research Institute,State Grid Hubei Electric Power Company,Wuhan 430071,China;College of Biomedical Engineering and Instrumental Science,Zhejiang University,Hangzhou 310027,China)
出处
《噪声与振动控制》
CSCD
2020年第5期187-191,共5页
Noise and Vibration Control
基金
国家自然科学基金资助项目(61803332,51875510)
国网湖北省公司科技支撑项目(SGTYHT/18-JS-206)。
关键词
声学
高压电抗器
厂界噪声
干涉声场
声学边界元
噪声控制
acoustics
high-voltage reactor
plant boundary noise
interference sound field
acoustic boundary element
noise control
