As a high-energy-consuming and continuous-production heavy industry site, chemical plants are equipped with a large number of non-linear power loads such as frequency converters
1. Background
As a high-energy-consuming and continuous-production heavy industry site, chemical plants are equipped with a large number of non-linear power loads such as frequency converters, motors, reaction kettles, compressors and UPS power supplies on the production line. These equipment operate under high load for a long time, which will cause a large number of power quality problems such as high-order harmonics, reactive power deficiency and three-phase voltage imbalance. In addition, chemical production has extremely high requirements for power supply stability, and power abnormalities are likely to trigger production risks. The application of Static Var Generator (SVG) in power harmonic control of chemical plants needs to adopt a combined centralized and decentralized deployment mode based on the plant's power distribution architecture and production process characteristics. Install large-capacity SVG main equipment on the 10kV high-voltage busbar of the plant's main power distribution station, and add distributed SVG units in the workshop's low-voltage power distribution cabinets and special power supply circuits of key production equipment. Through the real-time power grid monitoring system, collect voltage, current and harmonic component data at millisecond level, apply advanced instantaneous reactive power theory, and actively output compensation current with the same magnitude and opposite direction as the harmonic current, accurately offset the main harmonics such as 3rd, 5th, 7th and 9th generated by production equipment. At the same time, it dynamically compensates reactive power and adjusts three-phase load balance, fully adapting to the power consumption characteristics of 24-hour uninterrupted production and large load fluctuation in chemical plants. It can be connected to the existing power supply system without production shutdown and reconstruction, realizing real-time control of power quality in the whole process.
2. Solutions
The application of SVG effectively solves many potential problems caused by power harmonics in chemical plants, and comprehensively guarantees production safety and stability. Firstly, it greatly reduces the total harmonic distortion rate of the power grid, making it comply with national power standards and chemical industry power consumption specifications, avoiding overheating, increased noise and operation failure of motors, frequency converters and instruments caused by harmonics, preventing accelerated aging of equipment insulation, and eliminating production stagnation caused by equipment damage. Secondly, it stabilizes the power supply voltage, suppresses voltage flicker, instantaneous drop and fluctuation, avoiding process parameter deviation of core equipment such as chemical reaction kettles and rectifying towers due to power abnormalities, preventing safety and production accidents such as reaction out of control and raw material scrapping, and ensuring the continuous production process. Thirdly, it improves the system power factor to above 0.95, reduces reactive power loss, cuts down power loss of lines and transformers, avoids power factor fines from power departments, and reduces enterprise power consumption costs. Fourthly, it eliminates the interference of harmonics on the automatic control system and safety monitoring instruments of chemical plants, prevents misoperation of DCS system and distortion of monitoring data, avoids potential safety hazards caused by power signal interference in flammable and explosive production links, and strengthens the overall power supply safety of the plant area.
3. SVG benefits and efficiency
In summary, as an efficient power quality control equipment, SVG plays an irreplaceable role in power harmonic control of chemical plants. It can not only quickly and accurately eliminate power harmonic interference, solve problems such as reactive power imbalance and voltage instability, but also ensure the long-term stable operation of chemical production equipment, prevent production safety risks, achieve energy saving, consumption reduction, cost reduction and efficiency improvement. It fully complies with the core needs of chemical industry for safe production, continuous operation and high-efficiency energy saving, providing solid power support for the stable production and sustainable development of chemical plants.