The electrical equipment of metallurgical enterprises has the characteristics of large capacity, mostly inductive loads, large load impact, frequent starting and braking, fast speed, high degree of automation, and continuous work, making it a major consumer of electricity Electrical equipment extensively uses DC motors and inverters for driving, AC motors for variable frequency speed regulation, transformers, reactors, power electronic devices, and other nonlinear loads. Metallurgical equipment such as rolling mills and electric arc furnaces cause voltage fluctuations and flicker in the power grid, resulting in three-phase imbalance, low power factor, increased line losses, and excessive harmonic content. This has caused harmonic pollution, seriously endangering the operation of the power system and the economic operation of electrical equipment. Therefore, solving the problems of reactive power compensation and harmonic control in the power system is of great significance for ensuring the quality and operation of the power system, reducing losses, and improving the output of electrical equipment.
The problems faced by the steel metallurgy industry:
1. The DC rolling mill has a short working cycle, fast speed, and strong load impact. At the same time, the DC rolling mill generates high-order harmonics during operation, which affects the normal operation of electrical equipment
2. Medium frequency furnaces generate a large amount of harmonics during use, and harmonic pollution in the power grid becomes very serious
The characteristic of electric arc furnace operation is often three-phase imbalance, which can cause significant ineffective fluctuations during operation.
How to solve the problem of UPS power supply in the metallurgical industry by using IGBT modules instead of discrete components, which greatly improves the reliability of power modules and systems. Full front maintenance, providing up and down wire entry methods for convenient user wiring. Large touchscreen human-machine interface with rich information content. Independent charging system, powerful charging capability, and comprehensive battery management solution. Full digital module parallel technology, circulation index. Can be installed in close proximity to other devices, saving space in the computer room. Redundant intelligent speed regulating fan, low noise and energy-saving. The power distribution system is integrated inside the system cabinet, making installation extremely convenient and saving user investment.
Reactive power compensation and harmonic control scheme of Havens Electric:
According to the working characteristics of DC motors, Havens Electric recommends using thyristors for switching and protecting capacitors;
2. In response to the characteristic of generating a large amount of harmonics during the operation of intermediate frequency furnaces, Havens Electric recommends using power capacitors in series with reactors to form an LC filtering circuit to filter out harmonics; Or use APF active filters for harmonic control;
3. In response to the three-phase imbalance characteristics of electric arc furnaces, SVG reactive power compensation devices can be used for dynamic compensation.