Electrostatic dust removal high-frequency high-voltage power supply system and control method

Abstract

The invention discloses an electrostatic dust removal high-frequency high-voltage power supply system and a control method. The control method mainly comprises the steps that after the LCC resonance current and the secondary output voltage value of an electrostatic dust removal high-frequency high-voltage power supply pass a signal collection circuit, a conditioning circuit and an A / D switching circuit in sequence, a digital voltage signal is transmitted to a DSP control circuit; a DSP chip sends a PWM control signal to a digital logic unit and an IGBT driving circuit by combining the actual current and voltage values transmitted through a main circuit and comparing the actual current and voltage values with the preset values of the system; and the PWM control signal is used for controlling a full-bridge inverter finally by being processed and amplified. According to the control method related by the invention, the frequency converting control strategy and the phase-shifting control strategy are effectively combined, and disturbance of different stages of the system is subjected to hierarchical control through a double-loop-locked control structure, so that the dynamic characteristics of the system are improved, and the system has high adaptability to complex working conditions; and the frequency change of opening and closing is constricted, closing losses are effectively decreased, and the overall efficiency of the system is obviously improved.

Description

technical field [0001] The invention relates to an electrostatic precipitation high-frequency high-voltage power supply system, in particular to a control method of an electrostatic precipitation high-frequency high-voltage power supply system, and belongs to the technical field of environmental protection equipment. technical background [0002] In recent years, environmental problems such as severe smog and excessive PM2.5 concentration have seriously affected people's health and hampered the further development of industrialization. The main reason for this series of phenomena is the untreated smoke (powder) dust that is discharged into the air in the process of industrial production. Therefore, more and more attention is paid to the treatment of industrial dust pollution. [0003] High frequency and high voltage electrostatic precipitator has become the mainstream trend of electrostatic precipitator development due to its high dust removal efficiency and low power grid p...

AI Technical Summary

Problems solved by technology

[0004] Because the actual power supply system is a lagging system, the working environment is complex, and has the characteristics of nonlinearity, variability and complexity, it is difficult to accurately obtain the mathematical model, making it difficult to select the control parameters of the traditional PID controller, and it cannot be based on the cremation rate in real time. The change of the power supply can be effectively adjusted; the frequency conversion control has the advantages of simple process and uniform loss distribution, but the disadvantages of large switching frequency range, large turn-off loss, and complicated optimization of magnetic components affect the overall efficiency of the power supply system.

[0005] The patent document with application number 201410220497.8 discloses a fractional-order PID control method for electrostatic precipitator power supply. The disclosed method uses the fundamental wave approximation method to calculate the transfer function of high-frequency electrostatic precipitator power supply, while ignoring high-order harmonics and external The important impact of environmental interference on the high-frequency electrostatic precipitator power supply makes the modeling of the system inaccurate and seriously affects the control response effect of the power supply system

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