High-voltage side directly coupled electric dust removing pulse power source

Abstract

The invention discloses a high-voltage side directly coupled electric dust removing pulse power source, comprising a switch unit, a pre-charging unit, a current limiting reactor, a power frequency phase shifting transformer, a pulse generating unit and a high voltage coupling circuit, wherein the switch unit is composed of a circuit breaker and a contactor in series connection; a three-phase alternating current is connected to the current limiting reactor through the switch unit; the pre-charging unit is composed of the contactor and a current limiting resistor, and is connected in parallel atboth ends of the contactor of the switch unit for pre-charging a rear circuit when the system is first powered on; the power frequency transformer adopts a phase shifting transformer to divide into three groups of phase shifting angles, which are respectively -20 degrees, 0 degree, and +20 degrees, so as to form an 18-pulse rectification structure; high-voltage sides of each group are composed ofseveral identical segmented windings for isolation and boosting of alternating current voltages of the power grid; the pulse generating unit is composed of an IGBT, a diode, and a storage capacitor;and a direct current pulse voltage is output by controlling the switch of the IGBT. The high-voltage side directly coupled electric dust removing pulse power source is narrow in output high-voltage pulse, large in instantaneous output power, and strong in fault tolerance.

Description

technical field [0001] The invention relates to the technical field of pulse power supplies, in particular to an electrostatic precipitator pulse power supply directly coupled to a high-voltage side. Background technique [0002] In the electrostatic precipitator system, the electrostatic precipitator pulse power supply generates a pulse voltage, which is superimposed with the basic voltage and then provided to the dust collector body. The dust moves to the dust collection pole. Compared with the single basic voltage power supply mode, it can significantly increase the speed of dust entering, improve the charging effect of tiny particles, and greatly reduce the output power of the basic power supply to save electricity. According to the theory of electrostatic precipitator, the advancing speed of dust is proportional to the product of the average voltage of the electric field and the peak voltage, and the pulse width of the pulse power supply is too large, which will directl...

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Problems solved by technology

According to the theory of electrostatic precipitator, the approach speed of dust is proportional to the product of the average voltage of the electric field and the peak voltage, and the pulse width of the pulse power supply is too large, which will directly break down the air in the dust collector body, causing the electrostatic precipitator system to fail to work normally.

[0003] like Figure 5 As shown, the prior art electric dust removal pulse power supply circuit has the following disadvantages: 1. The system is complex, the failure rate is high, and the fault tolerance is poor; 2. The grid voltage is rectified with 6 pulses without control, and the harmonic distortion rate of the grid input current is large; 3. There are inverter circuits and intermediate frequency transformers in the electrical cabinet, which consume a lot of power and are difficult to dissipate heat. 4. The IGBT in the pulse generation circuit works in a pulse current state, and the instantaneous current is above 3000A, which causes electromagnetic interference to the surrounding electrical equipment. 5. The frequency and amplitude of the resonant current generated by the pulse generating circuit have a great relationship with the parasitic parameters of the pulse high-voltage transformer, and there are strict requirements on the process consistency of the pulse transformer and the long-term stability of the integrated parameters; 6. The current through the pulse high-voltage transformer is a large pulse current. In order to ensure that the magnetic core is not saturated, a large amount of magnetic materials are required, but the utilization rate is very low. At the same time, the existence of the pulse transformer limits the further increase of the output instantaneous power of the pulse power supply; 7. Pulse high-voltage transformer The pulse voltage formed by the output current on the body has a lot to do with the load characteristics of the body, and the adaptability to working conditions is poor; 8. The output pulse width is large, which is related to the electrical parameters of the system and cannot be adjusted, which is easy to cause the air in the body to directly shock wear, affecting the operation of the electrostatic precipitator system

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