A DSP-based electrostatic precipitator power supply voltage control system was developed. The control system uses TMS320F2812 as the control core, which can automatically track the change of electric field and effectively adjust the intermediate link AC voltage. The experimental results show that the control system can better control the electrostatic precipitator power supply and greatly improve the dust removal efficiency.
introduction
An electrostatic precipitator is a dedusting device that separates dust particles in a gas by a high voltage electric field. In order to obtain higher dust removal efficiency, the electrostatic precipitator is required to automatically adjust the output voltage and current according to the change of the working condition of the precipitator, so that the electrostatic precipitator operates at a higher voltage and current state. In addition, in the event of a malfunction of the electrostatic precipitator, the electrostatic precipitator needs to provide the necessary protection, and can quickly identify and react to signals such as flashover and overcurrent. Experiments have shown that the electrostatic precipitator control system based on TMS320F2812 can achieve these functions well.
1 Electrostatic dust removal three-phase power supply main circuit
1.1 Power main circuit
The main circuit of the three-phase power supply is shown in Figure 1. The three-phase AC 380V mains is sent to the three-phase thyristor voltage regulation circuit through the main contact of the circuit breaker. The output voltage is adjusted by controlling the conduction angle of the thyristor and then sent to the three-phase high voltage. The primary of the silicon rectifier transformer is cooled and rectified on the secondary side of the rectifier transformer to output a DC negative high voltage, and is supplied to the electrostatic precipitator through a damping resistor.
Compared with the conventional single-phase electrostatic precipitator power supply, the three-phase power supply has the following characteristics:
(1) Balanced power supply of the grid, three-phase symmetry, power factor close to 100%; (2) Due to the use of three-phase star input wiring, under the same power output conditions, the primary current and phase loss are reduced; (3) The earth improves the linearity of the output voltage and current, and the ripple coefficient of the full load output is less than 5%, which effectively increases the injected corona power of the dust removal reactor.
Figure 1 Schematic diagram of the main circuit of three-phase power supply
1.2 Principle of three-phase AC voltage regulation circuit
The AC voltage regulation circuit refers to an AC power control circuit that adopts a phase control method. There are many topologies for AC voltage regulator circuits. In this paper, two thyristors are connected in anti-parallel and connected in series between each phase AC power supply and load. Like the phase-controlled rectifier circuit, by controlling the phase corresponding to the opening of the thyristor, the thyristor is triggered once every half cycle of the power supply, and the effective value of the output voltage can be conveniently adjusted to achieve the purpose of AC voltage regulation.
2 Electrostatic dust removal three-phase power supply voltage control system
2.1 The overall structure of the control system
The block diagram of the control system is shown in Figure 2. The control system is based on TMS320F2812, which mainly includes voltage synchronization signal detection circuit, analog sampling circuit, switch isolation circuit, fire* detection circuit, SCR trigger circuit, serial communication circuit, etc. .
Figure 2 Control system block diagram
The analog quantity (primary voltage, primary current, secondary voltage, secondary current, etc.) collected in the field is sent to the ADC unit of the DSP through the analog signal conditioning circuit, and the DSP periodically samples and completes the A/D conversion. The DSP will A. The /D converted data is compared with the set parameters to calculate the conduction angle of the thyristor. After capturing the zero-crossing signal of the phase voltage, the DSP outputs a double narrow pulse, triggers the thyristor, and makes the thyristor output phase shift range adjustable from 5 to 90°, completes the adjustment of the three-phase AC voltage regulating part of the main circuit of the power supply, thereby realizing static electricity. Voltage closed-loop control of dust-removed three-phase power supply.
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