A pulse power supply for electrostatic precipitator with direct coupling on high voltage side

Abstract

The invention discloses an electric dust removal pulse power supply directly coupled at the high voltage side, which comprises 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, and the switch unit is composed of a circuit breaker The three-phase AC is connected to the current-limiting reactor through the switch unit. The pre-charging unit is composed of a contactor and a current-limiting resistor, and is connected in parallel to both ends of the contactor of the switch unit. The internal circuit is pre-charged. The power frequency transformer adopts a phase-shifting transformer, which is divided into three groups of phase-shifting angles, namely -20°, 0°, and +20°, forming an 18-pulse rectification structure. The high-voltage side of each group is composed of several Composed of the same segmented windings, the AC voltage of the grid is isolated and boosted. The pulse generating unit is composed of IGBTs, diodes, and energy storage capacitors. The DC pulse voltage is output by controlling the switch of the IGBT. The present invention outputs narrow, instantaneous high-voltage pulses. High output power and strong fault tolerance.

Description

technical field [0001] The invention relates to the technical field of pulse power supplies, in particular to a pulse power supply for electrostatic precipitators directly coupled to a high-voltage side. Background technique [0002] In the electrostatic precipitator system, the electric precipitator pulse power supply produces pulse voltage, which is superimposed with the base voltage and then supplied to the dust collector body. Dust moves to the dust collector. Compared with the single basic voltage power supply mode, it can significantly increase the speed of dust, 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 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 t...

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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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