Submerged Arc Furnace Power Factor
This paper relates to the field of reactive power compensation systems on the low-voltage side of the submerged arc furnace, especially the collection and control of the power factor of the submerged arc furnace in the reactive power compensator.
Power Factor Acquisition and Control System of Submerged Arc Furnace
The submerged arc furnace is an industrial electric furnace with huge power consumption. The structure and working characteristics of the submerged arc furnace determine that the transformer is mostly in the state of reactive power operation. A large amount of reactive power consumption on its short circuit and the resulting large operating voltage The drop is the main cause of low output and high power consumption.
The low-voltage and high-current characteristics of the short-circuit network determine that the short-circuit network will generate a large amount of reactive power, which will seriously occupy the load of the transformer and restrict the ability of the transformer to transmit active power, resulting in a low power factor of the submerged arc furnace transformer. Between 0.6 and 0.8, the low power factor not only reduces the efficiency of the transformer, but also produces a lot of useless work, and will also be charged an additional power penalty by the power department, which will increase the power imbalance between the three phases, resulting in low smelting efficiency. Increased power consumption; coupled with the fact that the length of the short network of the submerged arc furnace transformer is not equal, the three-phase power imbalance caused by smelting and the reactive power generated by the change of the smelting arc circulate on the submerged arc furnace transformer, short network, and power supply network. Exacerbated the reactive power loss of the whole submerged arc furnace.
In order to reduce the loss of the power grid and improve the quality of the power supply, the power supply bureau requires the power factor of the power consumption to be above 0.9, otherwise, the power consumer will be fined heavily. At the same time, the low power factor will also reduce the incoming line voltage of the submerged arc furnace and affect the smelting of calcium carbide.
Therefore, at present, large-capacity submerged arc furnaces at home and abroad must be equipped with reactive power compensation devices to improve the power factor of submerged arc furnaces.
Currently, three independent single-phase power factor meters are used for power factor acquisition and control, which are not controlled by the host computer because they cannot be integrated with the system. If manual compensation is required after stopping, parameters must be set on the compensator. Excessive technical requirements for operation, especially for on-site operators, are not conducive to flexible control. At the same time, the actual situation of the current input current and voltage data cannot be fed back.
Utility Model Content
The main purpose of the utility model is to provide a submerged arc furnace power factor acquisition control system, which aims to realize the automatic acquisition and control of the submerged arc furnace power factor acquisition control system, and at the same time perform real-time monitoring and feedback data in the submerged arc furnace.
The technical solution of the utility model is to provide a submerged arc furnace power factor acquisition control system, including a PLC controller, the PLC controller is connected with a power factor converter, a thyristor trigger module and a host computer, and the PLC controller is used to control the thyristor The trigger module performs capacitor switching compensation, receives data from the power factor converter, and uploads the data in the furnace to the host computer; the power factor converter is connected with a power acquisition module for collecting data in the submerged arc furnace.
Further, the power collection module acquires high-voltage side current and voltage data by using high-voltage CT/PT transformer transmission.
Further, the high-voltage side current and voltage data obtained by the power acquisition module are converted by a power factor converter and output to the PLC controller with a power factor.
Further, the PLC controller controls the thyristor trigger module to perform capacitor switching control according to the power factor output by the power factor converter.
Further, the PLC controller receives the power factor of the power factor converter and the switching feedback information of the thyristor trigger module and uploads the information to the host computer for monitoring.
Further, if the feedback data received by the host computer exceeds the set range, the host computer will send an alarm command to the PLC controller.
Further, it also includes an alarm module, the PLC controller is connected to the alarm module, and the PLC controller controls the alarm module to send an alarm signal after receiving the alarm command sent by the host computer.
The beneficial effects of the utility model are: the submerged arc furnace power factor acquisition control system realizes the automatic acquisition and control of the submerged arc furnace power factor acquisition control system, and at the same time performs real-time monitoring and feedback of data in the submerged arc furnace. In the process of input control without power compensation, the input power of the submerged arc furnace is stable, which fully makes up for the shortcomings of the traditional reactive power compensation system.
The submerged arc furnace power factor acquisition and control system solve the shortcomings of the traditional single submerged arc furnace power factor acquisition and control system. The automatic acquisition and control of the acquisition and control system, while performing real-time monitoring and feedback of data in the submerged arc furnace, at the same time ensure the stability of the input power of the submerged arc furnace during the input control process without power compensation, which fully compensates for the traditional no Insufficiency of the power compensation system.