Solutions to the issue of inverter shutdown due to voltage fluctuations

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During operation, power systems can experience sudden and significant voltage fluctuations or brief power outages followed by restoration due to reasons such as lightning strikes, short-circuit faults, reclosing operations, faults in the external or internal power grid, and the startup of large-scale equipment. This phenomenon is commonly referred to as \"voltage fluctuation\". The basic types of voltage fluctuations generated by power supply systems include: voltage dips, voltage spikes, short-term power outages, and voltage flicker (continuous fluctuations). 1) Sudden voltage drops or rises lasting from 0.5 cycles (10 ms) to 1 minute, with the voltage rising to 110%~180% of the nominal value, or falling to 10%~90% of the nominal value. 2) Voltage flicker: The envelope of the voltage waveform changes in a regular manner, or the voltage amplitude undergoes a series of random variations; this is generally manifested as the visual perception resulting from the lighting abnormalities caused by voltage fluctuations as perceived by the human eye. 3) Short-term power outage: A power interruption lasting from 0.5 cycles to 3 seconds. (such as automatic reclosing, reset, etc.). Utilities – Power center: induced draft fans, quench water pumps, seal water pumps, washing pumps, boiler feed water pumps, condensate water pumps, furnace water circulation pumps, and other important auxiliary pumps. Thermal power: coal feeders, powder feeders, supply fans, cooling fans, and other auxiliary equipment. Air separation unit: liquid oxygen pumps, water transfer pumps, liquid oxygen processing systems, liquid nitrogen pumps, air-cooling fans. Air compressor station: main lubricating oil pumps for air compressors. POX hydrogen production: high-pressure slurry pumps for gasifiers, burner cooling water pumps. Variable frequency drive motor circuits: blowers for heating furnaces and cracking furnaces, induced draft fans, air coolers, controller-driven fans, raw material transfer pumps, batching pumps, reflux pumps, antipolymerization agent pumps, slurry pumps, centrifugal pumps, mixing pumps, pelletizers in the extrusion granulation system, quench water pumps, seal water pumps, coal slurry feed pumps, mother liquor circulation pumps, washing pumps, liquid oxygen pumps, high-pressure slurry pumps, burner cooling water pumps, etc. The hydraulic interlock process loads include the lubrication oil pumps for the catalytic main fans, the lubrication oil pumps for the catalytic air compressors, the lubrication oil pumps for the hydrocracking cycle hydrogen compressors, and the lubrication oil pumps for the continuous reforming cycle hydrogen compressors. When there are voltage fluctuations in the power grid, the frequency converters connected to these main motors will report voltage-related faults as a result of such fluctuations, leading to equipment shutdown and production interruptions. This can cause losses for the enterprise and even result in accidents. Here, we recommend a device produced by Zhejiang Langpu Electrical Technology Co., Ltd., designed specifically for addressing voltage fluctuations in frequency converters. By dealing with such fluctuations in the DC bus of the frequency converter, this device offers low-voltage compensation, overvoltage suppression, and the ability to address voltage fluctuations in the control circuit. It is extremely convenient to use whether for new installations, additions, or renovations. The company has obtained ISO9001 certification. Its products have been tested by the Electrical Research Institute as well as by **reputable third-party testing agencies**, and they are in use in various petrochemical enterprises. The clients have given high praise to these products. Details of the products can be found in the attached PPT; you can also contact me at 13355835483, Mr. Zhou