关键词: 高阶累积量, 独立引风机, 变频控制技术, 节能性

Abstract: The step response characteristics of the induced draft fan cannot cope with the pure hysteresis phenomenon of the ventilation system,resulting in a high average energy consumption of the induced draft fan. A frequency conversion control technology for independent induced draft fans based on high-order cumulative quantities was been proposed. This article calculates the third and fourth order cumulative quantities of the induced draft fan power signal separately,and use them as power signal features to describe the nonlinear characteristics of the power signal and detects linear power oscillation signals. And also combining grey correlation method, analyzes the correlation between the characteristic sequence of
oscillation signal and the operating parameter sequence of induced draft fan, and extracts the key parameters of variable frequency control. Based on the output frequency of the frequency converter, support vector machine algorithm was introduced to construct the high-order response function of the output power,and the correlation sequence between the highorder cumulative quantity and the output power was divided. Based on real-time operating data, the independent induced draft fan was controlled by frequency conversion. The experimental results show that after variable frequency control of the induced draft fan, there is a significant difference between the fourth-order cumulative power signal and the original oscillation signal. The fluctuation amplitude of the induced draft fan is the smallest,and it can quickly respond to changes in wind speed. The average energy consumption of the induced draft fan is 1 185 kW / h,which has ideal energy-saving control.