A Real-Time Active Noise Control System for Low Frequency Substation Noise Suppression

Substation noise has become an important factor that influences the life quality of residents, especially in densely populated residential areas. Despite the relatively modest noise levels produced by small and medium-sized transformer facilities, their proximity to residential zones leads to significant annoyance, making them a focus in environmental noise-related complaints. The primary noise generated by these facilities falls within the medium and low-frequency range, where traditional passive noise reduction methods show limited success. This research develops a real-time active noise control (ANC) system based on the TMS320F28335 digital signal processor. The ANC algorithms, including FxLMS and FxNLMS, are implemented for real-time noise suppression. In the experiment, a series of sinusoidal signals and substation noises are employed to assess the system's effectiveness in noise suppression. The results highlight the efficacy of the ANC system, with an average noise reduction of over 12 dB for noises under 600 Hz.