基于广义FIR滤波器的电力设备有源噪声控制

Active Noise Control of Power Equipments Based on Generalized Finite Impulse Response Filter

针对电力系统设备噪声问题,探讨有源噪声控制的设计方法 ,提出基于广义有限脉冲响应(finite impulse response,FIR)滤波器优化的有源噪声前馈控制算法,同时给出了信号检测传感器的布放方案,并通过误差传感器评价噪声控制的效果。采集了2组电力设备的噪声作为初级声源,并进行有源降噪的仿真,仿真结果显示,频率为50、100和200 Hz的低频噪声成分被降低了12～18 dB,可见,利用有源噪声控制技术实现电力系统设备低频噪声的控制是一种有效的途径。

In allusion to the problem of power equipment noise, the design method for active noise control is discussed, and based on the optimization of generalized finite impulse response （FIR） filter an active noise feed-forward cancellation algorithm is proposed and a layout scheme of sensors for signal detection is given, meanwhile the effect of noise cancellation is evaluated by error sensors. The noise from two sets of power equipments is collected as primary sound source, and the simulation of active noise control （ANC） is performed. Simulation results show that the low-frequency noise components with frequencies of 50 Hz, 100 Hz and 200 Hz are reduced within the range from 12 dB to 18 dB, thus it can be seen that it is an effective approach to implement the control of low-frequency noise from power equipment by ANC technology.