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There are lots of negative effects caused by transformer noise. The energy of the noise is mainly distributed in several low frequency points shown by analysis of transformer noise characteristics. In response to these characteristics, this paper proposed a new power transformer active noise control (ANC) system based on the perturbation and observation method. The method, designed simply and trackingeffectively, is employed in the system which can adjust the deviation of amplitude and phase quickly and reduce the energy of the noise in low frequency points. Simulation results confirm the effectiveness of the method. KEYWORD: Perturbation and Observation Method; Transformer noise; Active Noise Control 4th International Conference on Mechanical Materials and Manufacturing Engineering (MMME 2016) © 2016. The authors Published by Atlantis Press 759 effect. When the transformer core is as exciter, the size of silicon steel sheet shrinks at the direction perpendicular to the magnetic field lines, while the size increases at the direction along the magnetic field lines. Therefore, the core generates a periodic vibration according to the change of excitation frequency, the vibration frequency is twice as high as the power current frequency, then the vibration transfers through insulating oil and core pad passed and leads to tank vibration. So the transformer radiate noise to the outside world. And power system requires the power transformer to run stably for a long time. Hence, the transformer noise is not completely random uncertain noise, most noise energy is concentrated in the even times of power frequency, and its frequency spectrum is concentrated from 100Hz to 600Hz. The change rate of baseband noise and 1 to 6 times harmonic noise is generally less than 0.4%. And more than 80% of the noise energy is concentrated in the frequency from 100 to 600Hz 5. This study has collected a number of power transformer noise signals in multiple 110kV substations as the research object. One measurement data is selected to analysis in time domain and frequency spectrum. The time domain and the frequency spectrum of a measurement point is shown in Figure 2. At the same time, a transformer in the residential area is located at ten meters ahead of a measurement point, the sound pressure level of transformer noise is measured once every 10 minutes, the measurement results are shown in Figure 3.

An Improved Perturbation and Observation Method for Power Transformer Active Noise Control