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Project Background   In the power system, the harmonic problem has been plaguing many projects, and the active filter cabinet we recently customized for the technical building and tower project of Guinea-Bissau Airport has become a key weapon to overcome this problem.   The Guinea-Bissau Airport project is of great significance to the country. The construction of its technical building and tower requires a stable, reliable and high-quality power supply system. However, various advanced equipment in the airport will generate harmonics during operation. If these harmonics are not managed, they will not only affect the normal operation of the equipment, but may even cause power grid failures, seriously threatening the operational safety of the airport.   The active filter cabinet we customized for the project's needs uses advanced power electronics technology and intelligent control systems. It can monitor the grid current in real time, accurately analyze the harmonic components therein, and quickly generate compensation currents equal to the harmonics and opposite in direction, thereby effectively filtering out the harmonics. This process not only improves the power quality, but also provides more stable and reliable power support for airport equipment.   What is "active power filter cabinet"?   Active power filter cabinet (APF) is an intelligent harmonic control device based on power electronics technology. It detects harmonic currents in the power grid in real time, dynamically generates reverse compensation current, accurately offsets harmonic pollution, and solves power quality problems such as voltage fluctuations and three-phase imbalance.   Compared with traditional passive filters (LC filters), active power filter cabinets have the characteristics of strong adaptability, fast response speed, and high filtering efficiency. They are especially suitable for modern industrial scenarios with high proportion of nonlinear loads and complex harmonics.   Why choose active power filter cabinet?   Full-band harmonic control Covering 2-50 harmonics, the compensation rate is as high as 97%, which completely solves the harmonic interference generated by inverters, rectifiers, medium frequency furnaces and other equipment. Dynamically track load changes and respond at milliseconds to avoid over-compensation or under-compensation caused by fixed parameters of traditional equipment.   Multifunctional integrated design Integrated harmonic control, reactive power compensation, and three-phase unbalanced regulation functions, one machine with multiple effects, reducing equipment investment costs. Supports parallel expansion and flexible adaptation to different capacity requirements (from 50A to 600A).   Intelligent monitoring and protection Built-in Internet of Things module, supports remote monitoring, data recording and fault warning, and can view power quality reports in real time through PC/mobile phone. Equipped with multiple protection mechanisms such as overcurrent, overvoltage, undervoltage, and overheating to ensure long-term stable operation of the equipment.   Green energy saving and compliance Reduce line losses caused by harmonics, improve power efficiency by 5%-15%, and help enterprises save energy and reduce consumption. Comply with international and domestic power quality standards such as IEEE 519 and GB/T 14549 to avoid the risk of power fines.   Which industries need it?   Manufacturing industry Typical loads: inverters, robots, CNC machine tools, electroplating power supplies Problems: Harmonics cause equipment false alarms, motor heating, and product yield fluctuations   Data centers and communication base stations Typical loads: UPS power supplies, servers, precision air conditioners Problems: Harmonics cause IT equipment downtime, capacitor bulging, and backup power failure   Commercial buildings and medical fields Typical loads: LED lighting, elevators, MRI magnetic resonance imaging devices Problems: Harmonics cause lighting flickering, elevator jitter, and reduced accuracy of medical imaging equipment   New energy and rail transit Typical loads: photovoltaic inverters, charging piles, traction power supply systems Problems: Harmonics cause grid connection anomalies, low charging efficiency, and contact network resonance   Welcome to consult The Guinea-Bissau Airport project is just one of our many successful cases. In the future, we will continue to deepen our active filtering field, continuously optimize product performance, expand the scope of application, solve harmonic problems for more industries and projects, and contribute to the improvement of global power quality.

Project background: In textile mills, air compressors are one of the indispensable equipment. Whether it is the pneumatic conveying of the cotton cleaning machine or the weft insertion system of the air jet loom, it is inseparable from the support of compressed air. However, traditional air compressor control methods often have many disadvantages, such as high energy consumption, large pressure fluctuations, and difficult maintenance. These problems not only affect the production efficiency of textile mills, but also increase the operating costs of enterprises. And our electrical control cabinet was born to meet this demand. It integrates advanced control technology, monitoring technology and protection technology, and can achieve precise control, real-time monitoring and comprehensive protection of air compressors, so that air compressors can operate in the best state, providing strong guarantee for the production of textile mills.   Actual combat case Customer background: A textile group has 8 branches, with a total installed power of air compressors of 3000kW and annual electricity bills exceeding 20 million yuan. Pain points: Multiple air compressors operating independently lead to pressure fluctuations and increased fabric defect rates; equipment maintenance relies on manual records, and the average repair time for faults exceeds 4 hours. Solution:We customized an intelligent air compressor group control system for it, and the core configuration includes: Main control unit: Siemens S7-1500 series PLC is used to achieve linkage control of 6 air compressors; Variable frequency drive: ABB ACS880 inverter dynamically adjusts the motor speed, and the pressure bandwidth is compressed to ±0.05MPa; Cloud-edge collaboration: The edge computing gateway collects 200+ parameters in real time, and the data is uploaded to the Alibaba Cloud IoT platform; Energy efficiency management: Predict gas demand through AI algorithms, automatically start and stop equipment combinations, and avoid "big horses pulling small carts". Results: Energy saving of 32%: annual electricity bill savings of 6.4 million yuan, with an investment payback period of only 18 months; Efficiency increased by 15%: fabric defect rate decreased by 0.8%, and the rate of high-quality products increased to 98.2%; Operation and maintenance costs reduced by 40%: predictive maintenance reduced unplanned downtime, and spare parts inventory turnover increased by 3 times.   Cooperation From single-machine control to intelligent production lines, from equipment suppliers to energy efficiency managers, we have always taken "making air compressors better understand textiles" as our mission. Whether you are: A growing company that wants to upgrade old air compressor stations An industry leader planning a new digital workshop An industrial park seeking EPC general contracting services We can provide one-stop services from solution design → equipment deployment → energy efficiency verification → operation and maintenance hosting. ,   How can our electrical control cabinets help textile mills cope with the challenges of peak production? A1: During peak production, the demand for compressed air in textile mills will increase sharply. Our electrical control cabinet uses intelligent algorithms to monitor the gas demand of the production line in real time, and automatically adjusts the operating status of the air compressor to ensure stable gas supply.   In terms of energy conservation and emission reduction, what are the specific performances of our electrical control cabinet? A2: Our electrical control cabinet adopts advanced frequency conversion technology and optimized control strategy, which can dynamically adjust the operating speed of the air compressor according to the actual gas demand to avoid unnecessary energy waste. Take a large textile group as an example. After introducing our intelligent air compressor group control system, the annual electricity bill savings reached 6.4 million yuan, and the investment recovery period was only 18 months.

What does HVAC mean? HVAC is an abbreviation for "heating, ventilation, and air conditioning." A residential HVAC system is a complete home comfort system that heats and cools your home, improves indoor air quality, and controls humidity. There are many different types of HVAC systems. They can include individual components such as air conditioning units, heat pumps, air handlers, furnaces, air purifiers, humidifiers, and dehumidifiers.   What is HVAC Control? The definition of an HVAC control system can vary depending on the purpose, whether it is a simple residential system or a very complex large system. But in general, an HVAC controller is defined as a device that regulates the operation of heating, ventilation, and air conditioning equipment. Typically, a home will have a thermostat connected to a standalone air conditioner. You can manage the operation of that standalone unit by modifying the temperature (or set point). For example, setting the thermostat to 75 degrees Fahrenheit in the summer will cause the air conditioner to run until the room reaches that temperature. In this simple example, your thermostat is both a sensor and an HVAC controller because it senses the temperature of your home. We will talk more about sensors as we explore more complex systems. When applied to larger facilities, HVAC control can sometimes become part of a larger system called building automation or energy management system.   How is the HVAC switchboard controlled? Multi-branch power distribution The busbar system is used to distribute the input power (usually three-phase 380V/220V) to multiple branches to provide independent power supply circuits for HVAC components such as compressors, fans, pumps, cooling towers, etc. For example, a precision switchboard can support up to 84 feeder circuits to meet the power distribution needs of complex systems. Branch circuit measurement is achieved through high-precision current transformers (CTs) with an error as low as ±1%, ensuring the accuracy of power distribution.   Four-level circuit protection system Short circuit/overload protection: built-in circuit breakers (such as frame circuit breakers, molded case circuit breakers) cut off the circuit within 0.1 seconds when the current is abnormal (such as short circuit current reaches more than 10 times the rated value). Leakage protection: cooperate with the leakage collection unit, trigger alarm and power off when the ground leakage current is ≥30mA. Phase sequence protection: detect the imbalance of three-phase voltage (act when it exceeds 15%) to prevent the motor from burning. Overvoltage/undervoltage protection: automatically trip when the voltage fluctuation exceeds ±10% of the rated value to protect sensitive electronic equipment.   Equipment-level control Contactor matrix: the start and stop control of fans and water pumps is realized through the contactor combination. The contactor coil voltage is usually AC220V, and the contact capacity covers 10A-630A. Variable frequency drive integration: The built-in variable frequency drive (VFD) adjusts the compressor and fan speed. For example, the vector control technology is used to adjust the fan speed steplessly within the range of 300-1500rpm, reducing energy consumption by 30%-50%.   Environmental parameter linkage control Temperature and humidity coupling adjustment: Receive the temperature and humidity set values ​​issued by the BAS system (such as 26℃/50%RH in summer and 20℃/40%RH in winter), and dynamically adjust the cold and heat source output through the PID algorithm. Air quality linkage: According to the CO₂ sensor (range 0-2000ppm) or PM2.5 detection data, the fresh air valve opening (0-100% stepless adjustment) and the filter section operation mode are automatically switched.