ZF-BP Series Water Cooled High Voltage Variable Frequency Drive
Water cooled high-voltage frequency converter is a power regulation device used to control high-power motors, designed specifically to meet high-capacity and high reliability application scenarios. Its core advantage lies in the use of water-cooled cooling technology to effectively solve the heat dissipation problem of high-power frequency converters during operation. At the same time, it has the characteristics of high efficiency, energy saving, high reliability, and low noise, and is widely used in industrial fields such as natural gas transportation, cement production, sewage treatment, metallurgy, and power.
Technical Principles and Structural Characteristics
- Working principle: The water-cooled high-voltage inverter is based on IGBT power unit series multilevel technology. Through vector control and SPWM control technology, it converts fixed frequency and voltage AC power into adjustable frequency and voltage electrical energy, achieving precise speed regulation of high-voltage motors. The core cooling system adopts water cooling method, which efficiently exports the heat generated by power devices through circulating cooling medium (such as pure water and antifreeze) to ensure stable operation of the equipment.
- Structural composition
1. Power unit cabinet: includes power units (including HV-IGBT), current sensors, water cooling pipelines, etc. It achieves variable frequency speed regulation and unit automatic bypass function by controlling HV-IGBT.
2. Water cooling system: including main circulation pump, filter, circulation pipeline, air radiator, etc. The cooling medium flows through the power unit driven by the circulation pump, transferring heat to the radiator and dissipating it.
3. Control circuit: Real time monitoring of input/output voltage, current and other parameters, generating PWM control signals to drive IGBT switching devices, ensuring that the output waveform is close to the ideal sine wave.
Application advantages
- Efficient and energy-saving: By adjusting the motor speed to achieve load matching and reduce energy consumption. For example, the flow rate of loads such as fans and pumps is proportional to the speed, the pressure is proportional to the second power of the speed, and the power is proportional to the third power of the speed. When the air volume decreases by 20%, the fan shaft power decreases by 49%; When the air volume decreases by 50%, the shaft power decreases by 87.5%, and the energy-saving effect is significant.
- High reliability: The water-cooled cooling method effectively reduces the temperature of power devices and extends the lifespan of equipment. For example, the new wind and solar water-cooled high-power high-voltage inverter adopts a high reliability design, which has the characteristics of low noise, high efficiency, and strong environmental adaptability.
- Large capacity support: Water cooling technology solves the heat dissipation problem of large capacity frequency converters and is suitable for large compressor systems above 10MW level. For example, Yongqing Station on the China Russia East Line uses 2 sets of 10kV/20MVA water-cooled high-voltage frequency converters, while Heihe Station on the natural gas pipeline uses 4 sets of 10kV/23MVA water-cooled frequency converters.
- Strong environmental adaptability: The water cooling system is insensitive to environmental temperature and humidity, and is suitable for harsh working conditions such as high temperature and high dust. For example, in the application of high-temperature fans at the kiln tail of cement clinker production lines, high-voltage frequency converters that can transmit electricity can adjust the motor speed on time.
Technological development trends
- Power density improvement: By using IGBT devices with higher voltage levels (such as 3300V IGBT), the number of power units is reduced, the main circuit structure is simplified, and the system reliability is improved.
- Intelligence and digitalization: Integrate remote monitoring, fault self diagnosis, fault-tolerant control and other functions to achieve intelligent operation and maintenance of equipment. For example, electrical products can support remote monitoring and module bypass technology to ensure system safety.
- Green low-carbon: Optimize the design of the water cooling system to reduce the consumption of cooling medium and energy; Adopting high-efficiency power devices to enhance the overall efficiency of the system
