Submerged arc furnace reactive power compensation system and method with static state and dynamic state combined

Abstract

The invention provides a submerged arc furnace reactive power compensation system and method with the static state and the dynamic state combined. The reactive power compensation system comprises a PLC processor, a high-voltage current transformer, a high-voltage voltage transformer, a transformer, a power coefficient transmitter, a current transmitter, a voltage transmitter, an active power transmitter, static state compensation branch circuits and dynamic state compensation branch circuit. Each compensation branch circuit is formed by connecting a silicon-controlled switching switch and a compensation capacitor in series. The output end of the power coefficient transmitter, the output end of the current transmitter, the output end of the voltage transmitter and the output end of the active power transmitter are electrically connected with an input port of the PLC processor, an output port of the PLC processor is electrically connected with the input end of the silicon-controlled switching switch and feedback signals of the silicon-controlled switching switch are all output to the PLC processor. By means of the method, the compensation system can efficiently and accurately control switching of the compensation branch circuits and the purposes that the power coefficient is balanced, strong phase overcompensation or weak phase undercompensation is avoided and the utilization rate of active loads is improved are achieved.

Description

technical field [0001] The invention relates to a reactive power compensation system for a submerged arc furnace, in particular to a reactive power compensation system and method based on a PLC controller combining static and dynamic conditions for a submerged arc furnace. Background technique [0002] The submerged arc furnace is a typical high energy consumption equipment. In the electrical system of the submerged arc furnace, the smelting transformer and the short network are both inductive loads, which consume a large amount of reactive power during operation, resulting in a generally low power factor. . In addition, during the production process of submerged arc furnaces, the load changes frequently, resulting in frequent changes in various electrical parameters such as power factor and active power. In addition, the length of the short network of each phase is not equal, resulting in three-phase reactive power itself. unbalanced. [0003] The traditional reactive pow...

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Problems solved by technology

[0002] The submerged arc furnace is a typical high energy consumption equipment. In the electrical system of the submerged arc furnace, the smelting transformer and the short network are both inductive loads, which consume a large amount of reactive power during operation, resulting in a generally low power factor.

In addition, during the production process of submerged arc furnaces, the load changes frequently, resulting in frequent changes in various electrical parameters such as power factor and active power. In addition, the length of the short network of each phase is not equal, resulting in three-phase reactive power itself. unbalanced

[0003] The traditional reactive power compensation system of metallurgical submerged arc furnace is mainly composed of vacuum contactors, fuses, self-healing capacitors and other components. The low-voltage compensation is a fixed compensation method of three-phase compensation. Reactive power compensation is carried out on the electrical system of the submerged arc furnace. However, the amount of reactive power compensation cannot change with the change of the load. When the device is switched on and off, the three-phase reactive power is compensated at the same time, resulting in over-compensation of the strong phase and under-compensation of the weak phase. , which leads to problems such as large impact during switching, large damage to capacitors, easy burning of switch contacts, high noise, long switching delay process, slow response, single protection function, etc., especially electrical parameters such as power factor cannot be effective Control within the range required by the process parameters

Therefore, due to the unbalanced three-phase reactive power compensation, the traditional reactive power compensation system causes unbalanced three-phase electrode voltage and unbalanced three-phase power factor, which cannot fully satisfy the effective control of process parameters due to load changes in the production process, directly resulting in The submerged arc furnace has low efficiency and high power consumption, and it does not guarantee the stability of the electrical system of the submerged arc furnace, which will also lead to deterioration of the power supply quality

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