Research On Related Technology Of DC Superimposed Pulse Power Supply For Electrostatic Precipitator

In recent years,with the continuous development of industry and the continuous expansion of production scale,the problem of environmental pollution caused by dust emissions has become increasingly prominent.The electrostatic precipitator can effectively reduce the concentration of dust in the air,and the precipitator power supply is the main factor affecting the dust removal efficiency of the precipitator.At present,the widely used dust collector power supply is a power frequency and a high frequency DC power supply,but the power frequency power supply has the disadvantages of large volume,high cost,and large fluctuation of output voltage;Although the high-frequency DC power supply has improved in terms of equipment volume,cost and output voltage fluctuation,the dust with large contrast resistance is easy to cause anti-corona phenomenon and reduce dust removal efficiency.In view of this,this paper aims to improve the dust removal efficiency of the dust collector.Based on the traditional power frequency and high frequency DC power supply,an efficient DC superimposed pulse power supply structure is given and the related technology is studied.The basic parameters of the power supply designed in this paper are: DC base voltage 60kV;pulse voltage is half-sinusoidal waveform with peak value of 80 kV,pulse width of 100 us,repetition frequency of 150 Hz,peak voltage of 140 kV after DC superimposed pulse;load equivalent is capacitance and resistance parallel structure.The high-voltage DC power supply part includes three-phase power frequency rectification,high-frequency full-bridge inverter,high-frequency transformer boost and secondary rectification and other circuit units.Considering the switching loss of the switching tube operating at high frequency,a resonant converter is introduced into the DC power supply to operate the switching tube in a soft switching state,thereby eliminating the switching loss of the switching tube.Then,select the appropriate working mode,derive the corresponding voltage regulation characteristics,and use Matlab to simulate the working state of the circuit to verify the correctness of the theoretical derivation.The pulse power supply part uses the RLC series oscillation mode to generate the pulse voltage,and uses the equivalent capacitance of the load and the leakage inductance of the pulse transformer to form the oscillating element,and generates a sinusoidal pulse voltage across the load of the dust collector.Theoretical analysis of the circuit in the time domain,the parameters of each component in the circuit are obtained,and the working state of the circuit is simulated by matlab,which verifies the correctness of the theoretical analysis.The high frequency DC power supply and the pulse power supply are connected in parallel to both ends of the load through a coupling reactor and a coupling capacitor.The transformer design part includes high voltage and high frequency transformer design of high voltage DC power supply and pulse transformer design of pulse power supply.According to the relevant design parameters,the core material and structure size of the transformer are selected,and the winding and insulation parameters are designed.Finally,the temperature rise and distribution parameters are checked.