| Looking at domestic and overseas industry,because of Calcium carbide furnace their own production conditions change.The three-phase electrode voltage is unbalanced and the actual power factor is low mainly caused by the sharp fluctuations in the arc current directly.It has a great impact on the furnace.The quality of the furnace does not only reduce the quality of calcium carbide,because the frequent changes in reactive voltage fluctuations and harmonics,eventually led to the enterprise due to the system power factor is not up to the power sector was fine for many years.So the rigorous measurement of the power quality of calcium carbide furnace and then put forward a reasonable power quality control program is to be solved.The calcium carbide furnace can be equivalent to a high power impact nonlinear inductive load,the complexity of its actual production process increases the difficulty of designing the reactive power compensation device.How to be more effective,easier to achieve,lower cost to design a performance consistent with the calcium carbide furnace reactive power compensation device,so that the reactive power compensation device can be in a safe and effective operation and achieve the desired compensation effect has become the current industrial applications of high-power nonlinear impact load power supply system design in a core issue.To improve the electric stone furnace on the public power grid power quality and improve their own power factor as the starting point,starting from analyzing the electrical characteristics of calcium carbide furnace,indicating that the calcium carbide furnace production operation led to its own low power factor and pollution of several factors.Comprehensive comparison of existing reactive power compensation device,putting forword a reasonable control scheme and a practical simulation and theoretical estimation of the applied compensation scheme for the electrical system model of the calcium carbide furnace.This is the joint dynamic compensation system engineering design of the three core links.This article discusses the three links in turn,the combined reactive power compensation device is applied to the power supply system of the calcium carbide furnace,real-time detection of reactive current in furnace by instantaneous reactive power theory,so that the entire joint compensation device can achieve a good compensation effect,effectively improve the system's power factor,improve the power quality.In this paper,the specific parameters of a calcium carbide furnace and its actual power supply system for the project background.The control strategy of the dynamic reactive power compensation process is studied.The reactive power is used as the main control target,the voltage is the auxiliary reference condition,the system reactive power and the grid voltage are adjusted synthetically.Programming control procedures in the PLC,using the PLC programmable controller control capacitor switching.Completed a complete set of PLC based on the high and low pressure side of the calcium carbide furnace reactive power compensation system design.To carry out repeated improvements and simulation in the design process of the design,until the most cost-effective to achieve the desired effect,put forward the optimal solution.Finally,according to the above control design and manufacture of high pressure side and low pressure side joint dynamic reactive power compensation device,applied to a calcium carbide furnace to obtain a better compensation effect.The results show that the reactive power compensation device can quickly track the reactive power change and improve the power quality. |
PDF Full Text Request