Active noise reduction method and device for vibration and noise reduction of urban distribution transformer

• Main Authors: GAO XU, HUANG YIBIAO, JIANG SHIXIONG, CHEN QUNLI, WU WENGENG, CHEN BINGBIN, WENG SUNXIAN
• Format: Patent
• Language: Chinese; English
• Published: 08.03.2022
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; INDUCTANCES; MAGNETS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; TRANSFORMERS

The invention relates to an active noise reduction method and device for vibration and noise reduction of an urban distribution transformer. Comprising a power grid voltage signal acquisition unit, a high-speed signal processing and harmonic analysis unit and an anti-phase harmonic generator PWM inversion unit. The power grid signal acquisition unit is used for detecting an output voltage signal of a transformer, inputting the output voltage signal to the high-speed signal processing unit and the harmonic analysis unit after proportional amplification, then performing Fourier transform on the detected voltage signal, calculating a main harmonic component contained in the power grid voltage, determining the harmonic order of the main harmonic component, and outputting the power grid voltage. An equation set of PWM inversion control moments is solved, the on and off moments of IGBTs in a quarter voltage cycle of a power grid are calculated, the moments are output to an IGBT driving circuit of a PWM inversion un